eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
1
16
10.21608/ejabf.1999.3439
3439
Original Article
OPTIMUM PROTEIN REQUIREMENTS OF PENAEUS JAPONICUS DURING WEANING STAGE BY USING MICROPARTICULATED DIETS
EI-Daka Y.
1
Samir Ghoniem
2
Abd-Elaziz Nour
3
Faculty of Environmental Agricultural Sciences, EI-Arish, l'lorth Sinai, Egypt
Faculty of Environmental Agricultural Sciences, EI-Arish, l'lorth Sinai, Egypt
Faculty of Agriculture, Alexandria University, Alexandria, Egypt
Agar-Microparticulated technique was used to study the protein requirements of shrimp, Penaeus japoncus, during weaning stage. Four experimental diets containing different dietary crude protein (CP) levels (25, 35, 45 and 55% CP) were prepared as Agar micro-binding diets (Agar- MBD) with size of 500-800 μm. All Agar-MBD were isocaloric andcontained gross energy of 456-490.2 Kcal GE /100g diet, however they varied in protein to energy ratio (56.5-1 19.3 mg protein per Kcal metabolizable energy). Eight circular conical bottomed fiberglass tanks with capacity of 300 L were used to rear 2000 PL20 (postlarvae) each. Initial weight of PL was 23 mg. Feeding period continued for six weeks until thefinal weight of PL reached to one gram. Each tank was provided with fine aeration, seawater inlet, seawater outlet and light source. All tanks were filled with filtered seawater. Water exchange rate was about 30% daily of the total volume of rearing water. Results showed that survival rate of P. japonicus increased as protein level increased until 41% CP, then it decreased. The same trend was found for final weight, gain and specific growth rate. The best feed conversion ratio was obtained when shrimps were fed on 41 % CP. Maximum growth of P. japonicus was obtained as the postlarvac consumed10.7 mg. Day-1 of the dietary protein. However, protein efficiency ratio decreased as the protein level increases. Therefore, the optimum protein level for weaning shrimp was 41 % CP with P/E ratio of 92.92 mg protein per Kcal ME.
https://ejabf.journals.ekb.eg/article_3439_d41d8cd98f00b204e9800998ecf8427e.pdf
Penaeus
japonicus
weaning diets
Agar-microbinding diets
protein
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
17
34
10.21608/ejabf.1999.3440
3440
Original Article
STUDIES ON THE REPRODUCTIVE FERFORMANCE OF PRAWN PENAEUS JAPONICUS BATE BROODSTOCK, BASED ON EGG QUALITY, HATCHING RATES AND AGE
Fatma Abdel Razek.
1
Anour EL. Agamy.
2
Soliman Rahman
3
Somya Taha
4
Mohammed Barbary
5
National Institute of Oceanography and Fisheries WIOF), Kayed Bay, Alexandria, Egypt.
National Institute of Oceanography and Fisheries WIOF), Kayed Bay, Alexandria, Egypt.
National Institute of Oceanography and Fisheries WIOF), Kayed Bay, Alexandria, Egypt.
National Institute of Oceanography and Fisheries WIOF), Kayed Bay, Alexandria, Egypt.
Zoology Department, Faculty of Science, Zagzig University
Knowledge of the inherent reproductive patterns of wild prawn populations is essential in predicating the expectedperformance of hatchery broodstock. During the four year study 1995-1998, assessment was made for broodstock of P. japonicus collected from the wild (AbuKir bay, Alexandria) over all spawning season (May-December). The reproductive performance of the broodstock was assessed on the bases of spawning process, egg production, nauphii production and hatchability rate in relation to size and weight of spawners. The results of spawning performance and larvalsurvival showed that among 179 specimens ranging in size from 13.0 to 23.0 cm in total length utilized for spawning, 134 specimens were succeeded for spawning (75 %). Higher percentages of full spawning (41%) and partially spawning (11.9 %) groups were observed in prawns belonging to the size group 15.0 ~17.0 cm in total length. The maximumnumber of eggs produced per female was 545,000 by full spawner of P. japonicus at 16.6 cm total length during the period May, July 1998. Higher hatchability rate (81%) from eggs to nauplius stages was recorded with spawners of the size group from 17.0~19.0 cm total length in average during the four years of study. The survival rate from nauplius tofirst post larvae (PL1) for full and partially spawned females were recorded for the same size group 17.0 ~I 9.0 cm and this size is expected for prawns of an age about 12 months old. May, June and July are considered the most active period for an effective spawning of P. japonicus in Egyptian Mediterranean water followed by another active spawning period in October-December. Water temperature was found to be the most effective environmental parameter for the active spawning performance of the investigated species.
https://ejabf.journals.ekb.eg/article_3440_d41d8cd98f00b204e9800998ecf8427e.pdf
Spawning efficiency of prawn
hatchability rate
Seed production
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
35
56
10.21608/ejabf.1999.3441
3441
Original Article
EFFECT OF DIFFERENT FEEDING LEVELS ON PERFORMANCE OF RABBITFISH, SIGANUS RIVULATUS, FINGERLINGS
Ashraf EI-Dakar
1
Department of Fish Resource and Aquaculture, Faculty of Environmental Agricultural Sciences, Suez Canal University, EIArish, Egypt.
Afeeding trial was carried out to study the effect of different feeding levels on growth, feed conversion ratio (FCR), proteinand energy utilization, body composition arid cost benefit of rnarine rabbitfish, Siganus rivulatus fingerlings. Eight net cages, each one hold about 0.5 m3 with (1.0 x 1.0 x 0.5 m dimensions), were put in fiberglass basin and used to stock 10 fingerlings with an average of 3.42 g/fish initial size. Four different feeding levels (2, 4. 6 and 8% of biomass weight of fish) were tested in the experiment. Fish were fed on the experimental diet which contains 27% crude protein. The feedwas divided into two equal parts for 84 days feeding period. Fish were weighed every two week intervals and feed amounts were adjusted on the basis of the new fish weight. Results indicated that growth performance of S. rivulatus wasto be directly related to feeding levels. It was increased as feeding level increases. The specific growth rate (SgR) values were 1.03, 1.41, 1.74 and 2.02 %/day for fish received 2, 4, 6 and 8% feeding levels, respectively. However, feed conversion ratio (FCR) was improved by decreasing the feeding levels. The best FCR value was obtained at lowfeeding level (2% of biomass weight). On the other hand, protein efficiency ratio (PER), productive protein value (PPV %) and energy retention (ER %) were declined with the increase of feeding levels. From economic view, low feeding level (2%) had lower feed cost and higher profit index than all tested feeding levels. This indicated that this level was economically recommended to be used in rabbitfish, S rivulatus feeding.
https://ejabf.journals.ekb.eg/article_3441_d41d8cd98f00b204e9800998ecf8427e.pdf
rabbitfish
Siganus rivulatas
fingerlings feedifig levels
Growth performance
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
55
72
10.21608/ejabf.1999.3442
3442
Original Article
EFFECT OF TRIPLOIDY INDUCTION ON MATURATION AND GROWTH TRAITS OF NILE TILAPIA, OREOCHROMIS NILOTICUS
Soltan A.
1
Mohammad Ibrahim
2
Fatma Hafez
3
Horstgen Shwark
4
Department of Animal Production, Faculty of Agriculture at Moshtohor, Zagazig University Banha Branch).
Department of Animal Production, Faculty of Agriculture at Moshtohor, Zagazig University Banha Branch).
Central Laboratory for Aquaculture Research at Abbassa, Agriculture. Research Center.
Institute of Animal Husbandry and Genetics, University of Gottingen, Germany
An experiment was conducted during 7 months period to test performance of triploidy including growth, sexual maturation, carcass and chemical analysis of 0. niloticus. Triploid 0. niloticus had heavier and longer bodies than diploids from 3 to 7 months of age, and the differences were not significant except for body length. This trend was also observed for condition factors, daily gain and specific growth rate. Feed conversion ratios were better for triploids at somestudied ages. In triploid of both sexes, the values of Gonado-somatic indices (GSI) were smaller than diploids with significant differences between the two ploidy sex groups. Hepato-somatic indices (HIS) of triploid 0. niloticus males were larger than that of diploid with significant differences between the two groups. However HIS of triploid femaleswere smaller than that of diploid females but the differences were insignificant. Carcass traits of triploid 0. niloticus showed higher percentages of dressing, viscera, by-products and lower percentages of flesh as compared with that obtained from the diploid. Chemical analysis of flesh indicated that protein, fat and ash percentages in triploid flesh were higher than in diploids, while the opposite trend was obtained with respect to moisture percentages.Triploid fish had the higher percentages of fat and ash and lower percentage of crude protein and moisture in its by-products with significant differences for moisture only
https://ejabf.journals.ekb.eg/article_3442_d41d8cd98f00b204e9800998ecf8427e.pdf
Trilopidy
Growth
sexual mauration
Nile tilapia
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
75
103
10.21608/ejabf.1999.3443
3443
Original Article
COMPARISON BETWEEN FRYING AND MICROWAVE COOKING OF "READY TO-EAT" EGYPTIAN SILVER CARP FISH STEAKS
Mohammad Abu-Taleb
1
Mohammad EL-Samkaiy
2
Mohammad Kilallaf
3
National Institute of Oceanography and Fisheries, Fish Processing and Technology Laboratory.
Food Science Department, Faculty of Agriculture, Am Shams University
Food Science Department, Faculty of Agriculture, Am Shams University
This research was designed to make comparison between frying and microwave cooking of Egyptian silver carp steaks (ESCS) that prepared before cooking by soaking in NaCl solution 15% for 3 hrs and in potassium sorbate solution 5% for 30 min. Frying and microwave cooking were done, (ES CS) packaged without orvacuum then stored at 4±1 0C. Samples were subjected to chemical, bacteriological as well as sensory evaluation after processing and during cold storage. The obtained results indicated that fried and microwave cooked (ESCS) contained 61.00 and 63.77% moisture, 73.18and 75.63% protein, 18.82 and 14.72% fat, 7.94 and 9.57% ash and 462.34 and 435.32 Kcal per 100 gram, respectively. Under refrigerated storage the shelf-life of fried (ESCS) extended to 120 days, while 100 days in microwave cooked (ESCS) was recorded. Two hundred bacterium cell per gram were found in fried (ESCS), whereas 4 folds were found in microwave cooked samples pre-soaked in potassium sorbate. Values of total volatile basic nitrogen (TVB-N), trimethylamine nitrogen (TMA-N), ammonia nitrogen (NH3-N), free amino nitrogen (FAN) and volatile reducingsubstance (VRS) were minimized after frying and processes Tyrosine and thiorbaibituric acid (THA) values of (ESCS) progressed after processing operations. The best product of cooked ready to-eat (ESCS) was that treatedwith potassium sorbate and packaged under vacuum. Furthermore, the statistical analysis showed that determinations of FAN, tyrosine value and TVN were more valuable in quality evaluation of refrigerated stored (ESCS).On the other hand, the statistical analysis of sensory evaluation scores assred success of (ESCS) as ready to-eat products charactrized by their high nutritive value and lower costs.
https://ejabf.journals.ekb.eg/article_3443_d41d8cd98f00b204e9800998ecf8427e.pdf
Sliver carp fish
frying
Microwave cooking
potassium
sorbate Ready to-eat products
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
105
121
10.21608/ejabf.1999.3444
3444
Original Article
ELECTROPHORETIC PATTERN OF COLD STORED "READY TO - EAT" SILVER CARP FISH (HYPOPHTHALMICHTHYS MOLITRIX) STEAKS PROTEIN
Khallaf F.
1
M. EI-Samkaiy
2
M. Abo - Taleb
3
Food Sci. Dept, Fac. of Agric, Am Shams Univ.
Food Sci. Dept, Fac. of Agric, Am Shams Univ.
National Institute of Oceanography & Fisheries, Fish Processing & Technology Laboratory.
This study was carried out on silver carp fish steaks that prepared as "ready to eat" product to follow up the electrophoretic pattern changes throughout cold storage period at 4 0C. Frying and microwave cooking processes were applied on samples soaked in 15% brine solution (w/v) /3hr. followed by soaking in 5% potassium sorbatesolution (w/v) 30 mm. Six distinct bands were observed during various storage periods of uncooked and microwave cooked samples. While, five bands were identified in fried samples. Soaking treatment did not affect the number of bands detected in uncooked samples (6 bands) till the end of storage. Meanwhile, 8 bands were detected at the end of storage of unsoaked ones. During cold storage, different fried samples showed 6 bands. Samples cooked by microwave oven showed variable number of bands throughout cold storage period. Slight decrease was noticed in pH value after soaking treatment, while, frying and microwave cooking treatments caused slight increase in pH values of fish steaks just after treatment then a continuous increase was recorded till the end of cold storage. At the beginning of storageof uncooked samples, pH values showed slight decrease followed by remarkable increase till the end of storage period.
https://ejabf.journals.ekb.eg/article_3444_d41d8cd98f00b204e9800998ecf8427e.pdf
Silver carp fish
Electrophoresis
ready to-eat products
frying
Microwave cooking
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
123
143
10.21608/ejabf.1999.3445
3445
Original Article
APPLICATION OF HAZARD ANALYSIS CRITICAL CONTROL POINT (HACCP) CONCEPT TO THE SMOKED HERRING INDUSTRY
EI-Samkary A.
1
El-Deep H.
2
Said El-Din Ahamed
3
Saied EI-Kazaz
4
Food Science Dept., Agriculture Fac., Am Shams Univ., Cairo.
Food Science Dept., Agriculture Fac., Am Shams Univ., Cairo.
Fish processing Lab., National Institute of Oceanography & Fisheries
Fish processing Lab., National Institute of Oceanography & Fisheries
The main goal of this work was to investigate the possibility of successful application of Hazard Analysis Critical Control Points (HACCP5) to control the safety and quality inside the processing steps of smoked herring. Chemical, bacterial and International Standards Organization (ISO) methods for inspection smoking steps were applied. Shelf-life of smoked herring remained without deterioration for 15 days at room temperature while under refrigerated storage, the shelf-life extended to 75 days. Raw herring contained 39.29 mg of total volatile bases nitrogen (TVB-N)/l00 g dry and reached 45.4 mg/I00 g dry after storage for 15 days under room temperature, while it was 49mg/l00 g dry after 75 days underrefrigeration. Also, each of trimethylamine nitrbgen (TMAN) and free amino nitrogen (FAN) contents in smoked herring increased, but the value of formaldehyde decreased with the extending of storage periods under different conditions. Salmonella, Psychrophilic and Enterobacteriaceae counts were detected in raw and smoked herring. Processing points caused complete destruction to all these dangerous bacteria. Destruction rate of Staphylococcus aureus counts was 75% particularly in cured smoked herring, and, the count of 210 Staphylococcus aureusi/g remained after processing, this value was insufficient to cause excretion of staph-toxin. Vibris parahaermolyticus count decreased after salting and curing with ksorbate solution points of herring samples either in whole or gutted fish. Their count in smoked herring packaged in polyethylene bags increased than those of packaged under vacuum. Biogenic amines were determined in herring under different conditions. The environmental contaminants results showed that raw herring contained 0.916 ppm lead (Pb) and 0.092 ppm mercury (Hg), but cadmium (Cd) was not detected. Furthermore, high level of phenolic compounds resulted from smoking point were absorbed particularly in the flesh of cured smoked herring. The results obtained revealed that there were four CCP5; salting, curing and storage points have been identified as CCP2 while the smoking point was identified as CCP1.
https://ejabf.journals.ekb.eg/article_3445_d41d8cd98f00b204e9800998ecf8427e.pdf
HACCP concept
Smoked herring
processing steps
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
145
156
10.21608/ejabf.1999.3446
3446
Original Article
STOCK ASSESSMENT OF THE GIANT CLAM (TRIDACNA MAXIMA) IN THE EGYPTIAN RED SEA
Raouf Kilada
1
Azza El-Ganainy
2
Marine Science Department, Faculty of Science, Suez Canal University. Ismailia, Egypt.
National Institute of Oceanography and Fisheries. P.O. Box 182, Suez Branch. Suez, Egypt
Stock assessment of giant clams was carried out in the Egyptian Red Sea as a step to establish a sound fishery policy. Two sectors were surveyed: Hurghada (17 sites) and Quseir (12 sites)where 394 and 229 clams were measured in the 2 areas, respectively. These were compared with another sample (6384 clams), which was investigated in 1996 in Sharm E1-Sheikh, in the northern Egyptian Red Sea. There was significant difference in clam density between Sharm El-Sheikh area and the other sectors (P=0.0001). Although the mean clam size in the northern sector was smaller than in thesouthern ones, there was no significant difference (P = 0.3191). However, this difference can be attributed to the variation in the mean temperature between the 2 habitats. Length-based study showed that current exploitationrate in Sharm El-Shekh was lower than in the other 2 sectors. This may be due to the strict management and monitoring of illegal fishing in this area. Although clam population is under-exploited in the 3 sectors. The differencebetween current and maximum exploitation rates was smaller in the southern sectors (Hurghada and Quseir) than in the northern one. This indicates higher fishing activities in the former areas. It is concluded that keeping the fishing activity at the present rate will not affect the natural population. Clam farming however, should be introduced in the meantime forthe sake of environmental conservation and protection of the clam natural population against over fishing that can lead to serious consequences.
https://ejabf.journals.ekb.eg/article_3446_d41d8cd98f00b204e9800998ecf8427e.pdf
Giant clams
Tridacnidae
Tridacna maxinia
Red Sea
Stock
Assessment
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
157
172
10.21608/ejabf.1999.3447
3447
Original Article
POPULATION DYNAMICS OF LIZRA CARINATA (ALENCIENNES, 1836) FROM THE GULF OF SUEZ, EGYPT.
Azza EI-Ganainy
1
Kamal EI-Boray
2
National Institute of Oceanography and Fisheries. P. O. Box 182 Suez, Egypt.
National Institute of Oceanography and Fisheries. P. O. Box 182.Suez, Egypt.
The length frcqueney data were analyzed using the FiSAT sofi ware to estimate the population parameters of lizra carinata ( = Mugil seheli from Suez Bay northern Gulf of Suez. The estimiatcd growth paramieters were L∞ =21.053 cm. and K = 0.84 Y-1 while the niortality rates were Z =3.25Y-1 and M =1.62Y-1 . The obtained length at first capture equals to Lc = 14.032 cm. and the recruitment pattern shows one annual recruitment pulse. The estimated current exploitionrate is slightly lower than thc estimated maximum exploitation rate indicating that the fishery resources of Mugil seheli from the Bay is in its optimum condition.
https://ejabf.journals.ekb.eg/article_3447_d41d8cd98f00b204e9800998ecf8427e.pdf
Population Dynamics. Liza carinata
suez gulf Red Sea
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
173
195
10.21608/ejabf.1999.3448
3448
Original Article
STUDY ON SOME COCCIDIAN PARASITES INFECTING CERTAIN FISHES IN SAUDI ARABIA
Abd-Allah Al-Hoot
1
Ahmed Abdel-Aziz
2
Mahrashan Abdel-Gawad
3
Atif EI-Toukhy
4
Zoology Dept., Fac. Sd., Zagazig Univ
AI-Azhar Univ
Cairo Univ.
Menoufia Univ., Egypt
Two types of coccidian parasites: Eimeria and Isospora were described from three species of fishes found in Saudi Arabia. Eimeria sp.1 infecting Argyrops sp.; Eimeria sp.2 & Eimeria sp.3 infecting Rastrelliger sp. and Eimeria sp.4 & Eimeria sp.5 and Isospora sp. infecting Oreochromis niloticus (from a fish farm). Oocysts of Eimeria sp.1 were spherical to subspherical, measured 29.5- 35.7μm in length and 25.5-28.8μm in width (mean: 31.7 x 29.4 μm) and L/wratio was 1.08. Oval to ellipsoid sporocysts measured 13.4-15.6μm in length and 9.3-11.8μm in width (mean: 13.3 x 10.6μm) and with a stieda body. Sporozoites measured 10.0-11 .3μm in length and 4.0-5.3μm in width (mean: 11.3 x 4.8 μm). Oocysts of E. sp.2 were spherical and characterized by their large size, being 38.1-41.6μm in diameter (mean: 40.3 μm). The outer layer of oocyst wall was thicker than the inner one. Sporocyst lacking stieda body and measured14.0-16.6μm in length and 12.1-13.5 in width (mean: 15.8 x 13.5 μm). Sporozoites were elongated and tapering at both ends. They measured 8.1-9.4 in length and 4.6-5.8μm in width (mean: 9.1 x 5.4 μm). Oocysts of E.sp.3 weresmall in size, measuring l7.5-20.9μm in diameter (mean: 19.6μm). Sporocyst had small stieda body and measured 7.4-9.5μm in length and 5.3-6.0μtm in width (mean: 8.6 x 5.7 μm). It contains a scattered residuum. 3.0 Sporozoiteswere banana shaped and measured 6.0-7.5μm in length and 3.O-4.1μm in width (mean: 7.0 x 3.6 μm).Esp.4 oocysts were subspherical and measured 35.1 -37.5μm in length and 29.6- 34.0 μm in width (mean: 36.8 x 32.5 μm) and L/w ratio was 1.13. The ovoid sporocyst had a nipple-shaped stieda body and measured 5-16.0μm in length and8.9-11.8 μm in width (mean: 14.1 x 1 0.5μm). Sporozoites were arranged head to tail in each sporocyst and measured 10.8-12.9 μm in length and 5.5-6.8μm in width (mean: 12.0 x 6.1 μm). Oocysts of Esp.5 were larger in size than those ofEsp.4 oocysts. They measured 48-5l.5μm in length and 8-49.5μm in width (mean: 50.7 x 48.4 μm) and L/w ratio was 1.05. They had one polar granule. Oocysts of Isospora sp. were ovoidal in shape and measured 27.6- 30.7μm in length and 25.5-27.2 μm in width (mean: 29.5 x 26.2 μm) and L/w ratio was 1.13. The sporocysts lacked a stieda body and measured 16.0-19.2 μm in length and 9.3-11.8μm in width (mean: 18.0x 12.8 μm.
https://ejabf.journals.ekb.eg/article_3448_d41d8cd98f00b204e9800998ecf8427e.pdf
Coccidian parasites, Eimeria
Isospora, Oocyst, Description, Site of infection, Fishes, Saudi Arabia
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
197
213
10.21608/ejabf.1999.3449
3449
Original Article
CILIATE PROTOZOANS' DIVERSITY IN DAMIETTA BRANCH OF THE RIVER NILE BETWEEN KALUBEYIA AND DAKAHLEYIA PROVINCES
Mansour Galal
1
Zoology Department, Faculty of Science, Menofeyla Univ., Shibin EIKoum, Menofeya. Egypt.
This study was carried out to detect the diversity of ciliates inhabiting Damietta branch of the Nile in a sector extending between Benha (Kalubeyia province) and Meet-Badr Hallawa (Dakahleyia province). A total of 38 genera ( 51 species) belonging to eight orders of the ciliate protozoans were identified. Five of these genera were recorded for the first time in that part of the Nile namely : Spathidium, Didinium, Dileptus, Saprodinium and Discomorphella. The most common orders were Hymenostomatida, Gymnostomatida, Hypotrichida, Trichostomatida and Peritrichida followed by the leastcommon ones: Heterotrichida, Oligotrichida and Odontostomatida. Regarding the ratio between pelagic and benthic ciliates, their percentage values lie within two ranges: the first one was narrow (7.7 - 8.6%) during the period Nov96-Feb97, while the second was wider (9.5-15.4%) during a period extending between March97 and Oct97.It was also proved that both the ciliate population densities and the organic matter were more or less highest in Benha Nile water and lowest in Meet-Badr Hallawa water throughout the whole studying period. This might be referred to the different human activities in these locations. The values of these two parameters were found to be highest during Sept. 1996 and declined till lowest levels on Feb97 and then they began to reincrease from March97 till Aug97. Bothparameters were found to be correlated and showed high level of statistical significance.
https://ejabf.journals.ekb.eg/article_3449_d41d8cd98f00b204e9800998ecf8427e.pdf
Ciliates
Damietta Branch
Protozoan diversity
River Nile
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
215
242
10.21608/ejabf.1999.3450
3450
Original Article
ECOLOGICAL CHARACTERISTICS OF PLANKTON IN BRACMSH WATER, EGYPT
Nagwa Abdel-Aziz
1
Mohammad Dorgham
2
National Institute of Oceanography and Fisheries, Alexandria, Egypt
Oceanography Department, Faculty of Science, Alexandria University, Egypt.
The dynamics of some ecological factors controlling abundance and structure of plankton community were studied at small scales of time and space in Boughaz El-Maadiya, a channel connecting a coastal lake (Lake Edku) with the Egyptian Mediterranean water at Abu Kir Bay. The continuous mixing of sea and lake waters led to instability in the ecologicalconditions and the biological structure of the ecosystem in the area, particularly the plankton.Weekly records ecological parameters and plankton abundance from the end of April to end of October 1997 revealed marked variations. Temperature of the surface water followed the traditional seasonal variations known in the Egyptian coastal waters, ranging from 19 to 290C. The pH experienced relatively wide temporal and spatial changes fluctuatingbetween 7.51 and 8.85. The water transparency appeared mostly low, reflected by small secchi depths (40-100 cm) during the whole period of study. Dissolved oxygen varied between 1.9 and 5.9 mi/I. Surface salinity fluctuated between a minimum of 0.84% and a maximum of 35.69 %O Phytoplankton crop measured by chlorophyll a sustained mostly highconcentrations (10.6-124.7 mg/m3), which might indicate an advanced eutrophication of the study area. Zooplankton counts were mostly high (average 86,473 organisms/m3) varying between 9x103=415x103 organisms/m3. Both phyto- and zooplankton crops showed remarkable spacial and temporal variations.Statistical treatment of the results indicated significant correlations between different parameters.
https://ejabf.journals.ekb.eg/article_3450_d41d8cd98f00b204e9800998ecf8427e.pdf
plankton ecology
Boughaz EI-Maadiya
Lake Edku
Abu Kir Bay
Brackish water ecology
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
243
268
10.21608/ejabf.1999.3451
3451
Original Article
A KEY FOR IDENTIFICATION AND DISTRIBUTION OF FRESHWATER CYCLOPOIDA (COPEPODA, CRUSTACEA) OF EGYPT
Mohammad Hussein
1
Ahmad Obuid-Allah
2
Azhar Mohammad
3
Zoology Dept., Faculty of sciences Assuit Univ. Assuit.
Zoology Dept., Faculty of sciences Assuit Univ. Assuit.
Zoology Dept., Faculty of sciences Assuit Univ. Assuit.
The present paper includes a proposed key, with diagnostic features and drawings, to identify the freshwater cyclopoids of Egypt. These are minute planktonic crustaceans that play an important role in the food web of freshwater ecosystem. Eleven species belonging to 10 genera were taxonomically described with their geographical distribution.
https://ejabf.journals.ekb.eg/article_3451_d41d8cd98f00b204e9800998ecf8427e.pdf
Diagnostic Key
freshwater Cyclopoida
copepoda
Crustacea
Distribution
Egypt
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
173
195
10.21608/ejabf.1999.3452
3452
Original Article
FIELD STUDY ON TYPES OF TRAPS AND SOME FACTORS AFFECTING TRAP CATCHABILITY OF THE CRAYFISII PROCAMBARUS CLARKII IN EGYPT
Waheed Emam
1
Mubarak Mubarak
2
Zoology Department, Fcaulty of Science. Ain Shams University, Cairo
Zoology Department, Fcaulty of Science. Ain Shams University, Cairo
Four types of traps were designed and tested monthly during 1997 in the field for effectiveness in crayfish catchability. Trap with one entrance and 3.0 cm mesh size of its netting cover was found to be the best type that can catch large marketable sizes of Procambarus clarkii (≥ 10 cm total length). The effect of trap density, bait type, habitat type, time interval sets, water quality on the effeciency of this trap type were also studied. The obtained results indicated that the highest catchability of the chosen trap type was obtained when four traps /100 m2 were used twice daily, each for six hours, baited with frozen fish and put in muddy shallow sites with high vegetation. Also catch per unit effort of this trap model was found to be positively correlated with water temperature, pH, water transparency and density of zooplankton and benthos and it was also affected by the rate of dissolved oxygen.
https://ejabf.journals.ekb.eg/article_3452_d41d8cd98f00b204e9800998ecf8427e.pdf
Crayfish
Procambarus clarkii
trap types
TRAP
Efficiency
trap density
trap intervals
bait type
habitat type
ecological factors
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
297
321
10.21608/ejabf.1999.3453
3453
Original Article
DIVERSITY Of COPEPODA SPECIES (CRIJSTACEA) IN FOUR FRESllWATER BODIES AT ASSIUT, UPPER EGYPT.
Azhar M.
1
Obuid-Allah OH.
2
Dept. of Zoology, Faculty, of Science, Asslut I Unversity, Assiut, Egypt
Dept. of Zoology, Faculty, of Science, Asslut I Unversity, Assiut, Egypt
Diverrsity of Copepoda species had been studied in four freshwater bodies at Assiut, Upper Egypt during two years;extending from 1991 -1993. The three indices, namely Margalefs taxa nchness index. Shanon-Wiener’s index of general diversity and evenness index were applied for the four sites investigated. The physical factors, including temperature of air and water, pH, and conductivity, were recorded during the investigation. ANOVA F-test was performed to detect significant differences between the environmental factors measured in the four sites. Also, clustering analysis was used to show tile degree of simuarity of the abovementioned indices between the four investigated sites. The result revealed that three sites are closely similar, but different fron) site4.
https://ejabf.journals.ekb.eg/article_3453_d41d8cd98f00b204e9800998ecf8427e.pdf
copepoda
Freshwater Egypt Diversity indices
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
323
345
10.21608/ejabf.1999.3454
3454
Original Article
COMPARATIVE LIGHT AND SCANNING ELECTRON MICROSCOPIC STUDIES ON THE TONGUE OF THE NILE CROCODILE, CROCODYLUS NILOTICUS AND THE DESERT FAT SAND RAT, PSAMMOMYS OBESUS
Ragaa EI-Deeb
1
Suzan Abd EI-Aziz
2
Department of Zoology, Faculty of science, Ain Shams University, Egypt
Department of Zoology, Faculty of science, Ain Shams University, Egypt
The dorsal lingual surface of the Nile crocodile, Crocodylus niloticus, a carnivorous freshwater reptilian animal and the desert fat sand rat, Psammomys obesus, a herbivorous mammal, were examined by the light and Scanning Electron microscopes. Filiform (Fl), fungiform (FU) and circumvallate papillae (CI) were observed in the tongue of the Nile crocodile while the sand rat tongue contained only, (Fl) and (FU) papillae. In the crocodile the fungiform papillae were scattered in clusters among the filiform ones and contained taste buds. In the fat sand rat, however, the filiform papillae were denselydistributed all over the dorsal surface of the lingual body and flowershaped (FU) papillae were scarcely found in between. Histologically, the dorsal lingual epithelium revealed differences between the two animals. In the crocodile it consisted of a stratified squamous epithelium while in the fat sand rat it consisted of a keratinized stratified squamous epithelium. Taste buds were found in the lingual epithelium of the crocodile but completely absent in that of the fat sand rat. The lingual submucosa of the crocodile contained a network of melanophores and numerous lymphocytic aggregations which werecompletely absent in that of the fat sand rat. The mucous glands were present in the ventral lingual mucosa of the fat sand rat but completely absent in that of the crocodile. The tongue of the crocodile was supported by a cartilaginous rod which was longer than that of the fat sand rat. It may be concluded that the histological differences between the tongues of both Crocodylus niloticus and Psammomys obesus, obviously reflect their carnivorous and herbivorous modes of feeding respectively.
https://ejabf.journals.ekb.eg/article_3454_d41d8cd98f00b204e9800998ecf8427e.pdf
Light and scanning microscopy tongue
Nile crocodile
desert
fate sand rat
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
347
367
10.21608/ejabf.1999.3455
3455
Original Article
GEO ENVIRONMENTAL STUDIES ON LAGOON MANZALA, EGYPT
Mohammad Abdel Gaul
1
Mohammad Hamed
2
Environmental Sciences Department, Factilty of Science at Dam letta Mansoura University, Damietta, Egypt.
National Institute of Oceanography and Fisheries, Academy of Scientific Research and Technology, Egypt.
Over the last few decades, lagoon Manzala has undergone dramatic environmental changes. The present study gives a clue about the present situation of the lagoon. The distribution of organic matter, Cu, Zn,Pb and Cd metal ions in surficial bottom sediments is discussed. Copper and Zinc ions are within the global limit except the northern portion around PortSaid that shows a relatively higher copper concentration. Cadmium and Lead ions are higher than the global standard values. Increased discharges of agricultural and industrial wastes may be an important factor underlyingthese higher values, where the superficial sediments of the study drains show highly enrichment than the global standard values. Human activities that have impacts on the lagoon should be revised in order to conserve the lagoon as a natural resource site.
https://ejabf.journals.ekb.eg/article_3455_d41d8cd98f00b204e9800998ecf8427e.pdf
Geo- Environmental
Lagoon Manzala
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
369
397
10.21608/ejabf.1999.3456
3456
Original Article
DISTRlBUTION OF HEAVY METALS IN THE DAMIETTA NILE ESTUARY ECOSYSTEM.
Abd-Alla Ibrahim
1
Mohammad Bahnasawy
2
Saham Mansy
3
Refaat EL-Fayomy
4
Zoology Dept , Faculty of Sci. Am Shams Univ.
Zoology Dept Damietta i~aciilty of Sd , Mansoura Univ.
Zoology Dept Damietta i~aciilty of Sd , Mansoura Univ.
Zoology Pept. Faculty of Sci, Mansoura Uinv.
Cu, Zn, Cd and Pb concentrations have been determined in water. bottom sediment and fishes (Oreochromi. aureus and Liza ramada ) in Damietta Nile Estuary The results show that, heavy metals concentration in water was foundin the following descending order : Zn > Pb > Cu > Cd , with average concentrations between 0.03 and 0.35 for Cu 0 13 and 0.79 for Zn 0.001 and 0.005 for Cd , 0.02 and 0.51 mg/Ifor Pb. The maximum concentrations of Cu , Zn and Cd in water was found in Damietta city, while Pb concentration was the highest, in El-Borg city coast, where ship building is common. Moreover. Pb concenttdtion in most studied sites was found to exceed the international permissible limit.Heavy metals concentration in sediment was many times higher than those of overlying water, and followed the order : Zn > Cu > Pb > Cd. Zn and Cu concentrations in sediment of most studied sites that far exceeded the international standard concentrations. Heavy metals concentration in the muscles of O.aureus and L.ramada followed theorder: Zn> Cu> Pb> Cd. The muscles and liver of L.ramada accumulated higher levels of heavy metals than those of O. aureus. However, higher concentrations were reported in the liver, while the edible muscles still have lower levels of heavy metals than the international permissible levels.
https://ejabf.journals.ekb.eg/article_3456_d41d8cd98f00b204e9800998ecf8427e.pdf
River Nile Heavy metals
water
Sediment
lizra ramada
Oreochromis aureus
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
399
421
10.21608/ejabf.1999.3457
3457
Original Article
HEAVY METAL CONCENTRATION IN SOME ORGANS OF OREOCHROMIS NILOTICUS L. INSIDE AND OUTSIDE FISH CAGES IN RIVER NILE AT DAMIETTA REGION-
Eaman Abdel-Baky
1
Mohammad Zyadah
2
Salah Etreby
3
Eman Dorgham
4
Zoology Depart., Damletta Faculty of Science, Mansoura University
Environmental Sciences Depart., Damietta Faculty of Science, ~ansoura University.
Marine Science Depart., Faculty of Science, Suez Canal University
Marine Science Depart., Faculty of Science, Suez Canal University
Copper, lead and zinc were measured in the organs (muscles, gills and gonads) of Oreochromis niloticus inside and outside fish cages in River Nile at Damietta Region from five different ecological sites throughout the period from spring 1996 to spring 1997. The obtained data were subjected to analysis of variance (one-way, two-way and three-way anova) in order to find the significant differences of metal concentration in fish organs wjth respect to inside and outside cages, seasons and sites. Present results revealed that metal concentration in fish organs inside and outside fish cages, respectively exhibited the following descending order: Cu (μgg wet weight), gonads (5.27±0.87 and 4.45±0.86) > gills (4.17±0.47 and 2.37±0.27) > muscles (l.49±0.18 and O.99±0.16); Pb (μg/g wet weight),gills (3.94±0.39 and I .54±0.39) > gonads (2.77±0.60 and I .29±0.25) >muscles (I .92±0.23 and O.87±0. 12) and Zn (μg/g wet weight), muscles (14.8±0.2 and 13.2±1.2) > gills (12.3±2.4 and 7.89±0.55) > gonads (10.2±0.7and 6.82± 0.2I). Concentration of tested heavy metals in fish organs followed a sequence of: Zn > Cu> Pb. Concentration of heavy metalsin O. niloucus organs inside cages was significantly higher than that outside cages. The seasonal and site variation of tested metals concentration in organs of O. niloticus inside and outside cages revecaled strong significant differences ( p < 0.05). Except copper in muscles, the tested metals concentration in fish organs showed a similar seasonal trendwith their concentration in water and sediment. Site I and III and sometime IV were the most polluted sites by heavy metals. Copper and zinc levels in O . niloticus organs (except gonads) lie within the safe limits. On the otherhand, lead concentrations exceeded the permissible maximum world level in fish organs.
https://ejabf.journals.ekb.eg/article_3457_d41d8cd98f00b204e9800998ecf8427e.pdf
Heavy metals
Fish cages
River Nile
Damieua Branch
Oreochromis niloticus
Fish organs
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
423
439
10.21608/ejabf.1999.3458
3458
Original Article
MICROPLANKTON OF THE GREAT BITTER L~KE, SUEZ CANAL, EGYPT
Hamed EI-Serehy
1
Saied Farghaly
2
Hanan Mohammed
3
Zoology Dept., faculty of Science, Suez Canal University
Marine Science Dept., faculty of Science, Suez Canal University
Marine Science Dept., faculty of Science, Suez Canal University
Both Little and Great Bitter lakes are the central and most important water body (85% of the canal system) of the Suez Canal. The Great Bitter Lake lies at 30º 14´ 30º 25´ latitudes and 32º 17´ - 32º 30´ longitudes with a total length of 24 km, maximum width of 13 km. total surface area of 312 km2, undredged depth of 6 m and maximum dredged depth of 23 m. Moreover, Great Bitter Lake has a unique marine water ecosystem with uniform water temperature, salinity being above the sea level and its water movements are probably due to tidal influence from the Suez Gulf.The distribution and species composition of microplankton community in the Great Bitter Lake area were carried out during the period November 1991 - November 1992. Fifly-nine microplankton species belonging to four floristic groups of diatoms, dinoflagellates. green and blue green algae as well as two faunistic groups of tintinnids and foraminiferidswere catalogued. Diatoms constituted about 66.79% of the total plankton number, followed by dinofiagellates (17.27%). tintinnids (6.7%), green algae (6.4%), for aminiferids (2.18%) and finally blue green algae with 0.66% of the total counts. Site and seasonal dynamics of phytoplankton as well as protozooplankton and their herbivorous activity provide the major route for the herbivorous fate of phytoplankton in the Great Bitter Lake at the southern part of the Suez Canal.
https://ejabf.journals.ekb.eg/article_3458_d41d8cd98f00b204e9800998ecf8427e.pdf
Marine water
microplankton
Suez Canal. Lakes
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
441
457
10.21608/ejabf.1999.3459
3459
Original Article
EVALUATION OF COTTONSEED MEAL AS PARTIAL ANI) COMPLETE REPLACEMENT OF FISII MEAL IN PRACTICAL DIETS OF NILE TILAPIA, OREOCHROMIS NILOTICUS (BOULENGER) FINGERLINGS
Deyab EI-Saidy
1
Poultry Production Dept., Fac. of Agriculture, Minufia Univ., Shebin EIKom.
The main objective of this study was to determine the effect of partial and total replacement of fish meal by cottonseed meal in practical diets of Nile tilapia fingerlings on growth performance, feed utilization, body composition and some biological measurements of Nile tilapia, Oreochromis niloticus (B). Fish of an average weight 18.1 ±0.2 g werestocked in 15 glass aquariums (80 L each) at a rate of 15 fish per aquarium. Fish meal (40 % of the diet) was used as the sole source of animal protein in the control diet. Percent replacement of fish meal by cottonseed meal on thebasis of crude protein were as follows: 0 % (control diet A), 25 % (diet B),50 % (diet C), 75 % (diet D) and 100 % (diet E). Diets were fed to fish at a rate of 4 %, then gradually reduced to 3 % of the total fish biomass daily,for a period of 14 weeks. The results of this study revealed that, the fish fed on diet B had significantly (P ≤ 0.01) best average body weight, average body lengrh, specific growth rate (SGR), weight gain %, feed conversionratio (FCR), and protein efficiency ratio (PBR) from those of fish fed on control diet A and all other diets. The same parameters of fish fed on diet C were not significantly different (P > 0.05) from those of fish fed on the control diet A. Condition factor (K), hepatosomatic index (HSI) and survival rate % of the fish fed experimental diets B and C were notsignificantly different (P >0.05) from those of fish fed on the control diet A.The best values of hematocrit % and hemoglobin % were recorded with groups of fish fed on diet A (control) and diet B (25 % cotton seed meal)and then decreased significantly (P ≤ 0.01) with increasing cotton seed meal level in diets C, D, and E. Body composition of crude protein and crude fat (wet and dry basis %) and apparent digestibility coefficient of crude protein and crude fat of the fish fed experimental diets B and C did not differ significantly (P> 0.05) from those of fish fed on the control diet A.Therefore these findings suggest that up to 50 % of fish meal protein can be replaced by cotton seed meal protein in fingerlings Nile tilapia diets.
https://ejabf.journals.ekb.eg/article_3459_d41d8cd98f00b204e9800998ecf8427e.pdf
cottonseed meal
Nile tilapia nutrition
feed
utilization
apparent digestibility coefficient
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
459
471
10.21608/ejabf.1999.3460
3460
Original Article
BIOCHEMICAL CHANGES IN FISH LIVER AND MUSCLES DURING ULCERATIVE DERMAL NECROSIS (UDN) FISH DISEASE
Ezzar Awad
1
Moustafa EL-Feki
2
Zoology Department, Faculty of Science, Minia University, EI-Minia, Egypt
Zoology Department, Faculty of Science, Minia University, EI-Minia, Egypt
Four weeks of injection by Saprolegnia diclina on grass carp, Ctenopharyngodon idella indicated decrease in total protein content in liver, muscle and blood serum. Also, the liver and muscle glycogen was depleted. On the other hand, while the liver lipid was sharply decreased, it was elevated in muscles and blood serum. In addition, the ascorbic acid ofthe anterior kidney was depleted.
https://ejabf.journals.ekb.eg/article_3460_d41d8cd98f00b204e9800998ecf8427e.pdf
Biochemical changes
Liver
Muscles
Grass carp
Saprolegnia dicilna
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
473
491
10.21608/ejabf.1999.3461
3461
Original Article
FISH IMMUNE RESPO AGAINST HETEROGENEOUS ANTIGENS
Moustafa EI-Feki
1
Zinab Radwan
2
Hoda EI-Fayoumi
3
Department of Zoology, Fac. of Sci., Minia Univ., Minia, Egypt
Department of Zoology, Fac. of Sci., Cairo Univ., Beni-Suef Branch
Department of Zoology, Fac. of Sci., Cairo Univ., Beni-Suef Branch
The study had been carried out to evaluate how the fish immune system could be respond to different antigens and what was the most effective antigen that could be used for fish vaccination. In addition, it was to look at the differences between the fish primary and secondary immune responses after antigenic challenge. The fish was intraperitonealy (i.p) injected with bovine serum albumen (BSA) (2.5 mg/mI) as soluble biological antigen, sheep red blood cells (20%) (SRBC(s)) as non-soluble biological antigen and charcoal (2.5%) as non-biological non-soluble antigen, at different time intervals. The primary immune response was assessed at 2, 5, 11, and 14 days postinjection,while the secondary immune response was studied by giving a further injection 19 days after the primary immunization, and the responsewas measured at 20, 23, 26, and 29 days. The haemagglutinating antibody productions showed a continuousincrease with a maximum value after 14 days in case of BSA antigen. Although with charcoal and SRBC(s) , the highest values recorded at the 20th day, where they were decreased up to the end of the experiment. The plaque forming cells (PFC) count was increased up to 11 days, followed by sharp decrease until the 14 days, then re-increased again up to 23 days before it was dropped at the end 6f the experimental time. The rosette forming cells (RFC) count nearly showed the same behaviour with the three antigens, where it was increased up to 8 days followed by decrease at 11 and 14 days, then sharply increased after the secondary injection. The total WBCs was increased, while the differential leucocytecount gave fluctuated results. Although, the percentage of the phagocytic activity was decreased through the primary response, it was increased during the secondary injection with SRBC(s) and decreased with chareoal.
https://ejabf.journals.ekb.eg/article_3461_d41d8cd98f00b204e9800998ecf8427e.pdf
fish
immunity
hetergenous antigens
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
493
507
10.21608/ejabf.1999.3462
3462
Original Article
RESPONSE OF PLANKTONIC ORGANISMS TO AN ACCIDENTAL OIL SPILLAGE IN THE ARABIAN GULF ECOSYSTEM
Hamed EI-Serehy
1
Suez Canal Univ., Faculty of Science, Ismal Ia, Egypt
On January 7, 1998, an accidental oil spillage was detected at Umm Al-Quwain shores of the United Arab Emirates in the Arabian Gulf. The source of spillage was found to be a sinking down of the oil tanker "Banton 300", 5 miles far from Umm Al-Quwain shores. The response of planktonic organisms to an accidental spillage of 10000 tons of Iranian crude oil wasstudied. Bacterioplankton, protozooplankton as well as, phytoplankton groups were the more tolerant organisms on one hand, and the zooplankton group was a sensitive indicator of environmental hydrocarbon contamination of the accidental spillage on the other.
https://ejabf.journals.ekb.eg/article_3462_d41d8cd98f00b204e9800998ecf8427e.pdf
Oil spill impacts
Plankton
Arabian Gulf
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
509
524
10.21608/ejabf.1999.3463
3463
Original Article
TROPHIC RELATIONSHIPS OF PROTOZOOPLANKTON COMMUNITIES IN ALSAMMALIAH ISLAND WATERS, UAEARABIAN GULF
Hamed EI-Serehy
1
Suez Canal Univ., Faculty of Science, Zoology Department, Ismailia, Egypt
AlSammaliah IsJand is one of more than 200 islands belonging to United Arab Emirates in the Arabian Gulf. This inshore shallow island has a surface area of about 32 km2; lies at the north east coast of Abu Dhabi and is connected to the Arabian Gulf through Khor Laffan. The abundance of ciliates at Al-Sammaliah Island water showed an annual cycle with highest ciliate numbers (23 ml-1) in the spring, and lowest values (0.5 ml-1) in summer. The ciliate community was generally dominated by non-loricate oligotrichs, tintinnids, and other planktonic forms but by lower abundance, as well as a seasonally varying numbers of benthic forms. Nanoflagellates that could provide a food supply for the filter -feeding ciliates were especially numerous in the spring, but this was not the case for bacteria. The high populations of ciliates and flagellates reflect the productivity while the production of bacteria is presumably a more important component at the base of the food chain at the island water. Total nanoflagellates, heterotrophic nanoflagellates and bacteriawere enumerated to gain some indication of the food resources for ciliates. In this connection, the filtration activities of the heterotrophic flagellates and ciliates are compared with the population densities of bacteria, flagellates and filterfeeding ciliates. Moreover, the time required for the whole water body to be filtered by flagellates and ciliates was calculated.
https://ejabf.journals.ekb.eg/article_3463_d41d8cd98f00b204e9800998ecf8427e.pdf
Ciliates
Plankton
islands
Arabian Gulf
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
525
537
10.21608/ejabf.1999.3464
3464
Original Article
EFFECTS OF SOME ECOLOGICAL FACTORS AND HUMAN ACTIVITIES ON SPECIES DIVERSITY OF CORAL REEFS IN PROTECTED AREAS AT GULF OF AQABA, RED SEA, EGYPT
Magdy KhaIiI
1
Department of Zoology, Faculty of Science, Ain Shams University
In view of the significant contributions of coral reefs to the productivity of the coastal waters at Gulf of Aqaba, Red Sea, the Egyptian government declared three protected areas, during the period 1983-1992 namely Ras Mohammed, Nabq and Abu Galoum. Through a project aiming to study the species biodiversity in these reserves, the structure of coral community has been investigated to determine the effect of human activities and other destructive factors on itsdiversity. Line transects and Reefwatch methods were used to survey the community structure of corals in 11 sites, inside the three reserves. 71 hermatypic coral species have heen recorded during this study, in the three reserves. Ras Mohammed Park reef has the highest diversity, especially in closed areas, where all forms of fishing, diving or snorkellingwere banned since 1992, Abu Galoum comes next, then Nabq reserve.In conclusion, marine reserves can protect biodiversitv and provide areas in a natural balance free from direct human disturbance and provide an insurance policy against communities collapse.
https://ejabf.journals.ekb.eg/article_3464_d41d8cd98f00b204e9800998ecf8427e.pdf
Species diversity
Coral reefs
Protected Areas
Gulf of Aqaba
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
539
564
10.21608/ejabf.1999.3465
3465
Original Article
FISHERY ASSESSMENT STUDY OF LAKE MANZALA, EGYPT
Nabil Abd El-Hakim
1
Ahmad Azab
2
Waheed Emam
3
ElSayed Sherif
4
Faculty of Agriculture, AI-Azhar University, Cairo, Egypt
Faculty of Science, A1-Azhar University, Cairo, Egypt
Faculty of Science, Ain Shams University, Cairo, Egypt
Central Laboratdry of Fish recourse Studies. Center of Agricultural Studies.
The status of fishery in lake Manzala was evaluated during the period 1989-1998. Analysis of the annual catch variations of the total fish production and fishing effort indicated an increment in the index number of the total yield, effort and catch per unit effort by about 38.8 %, 5 % and 32% respectively during 1998. The annual variation in the total tilapia catch produced 57 % variation in the total fish yield during the period of this study. The estimated maximum sustainable yield for the total fish yield was about 64500 ton/year, while that of effort was 5405 boats and 16243 fishermen. The results indicated that the proper management of fisheries in lake Manzala can be achieved by reducing the current effort by 594 boats and 1842 fishermen. Analysis of the catch composition indicated that during 1998, the total fish yield consisted of miscellaneous group that including small fish of tilapia, mullets and others and this caused recruitmentoverfishing of the fish stock in this lake.The present results showed that more than 90 % of the total yield was obtained from Mataria landing site and tilapia catch represents 49 % of it. The effect of the ecological factorson fish and species composition was studied and the results were discussed.For the proper management of fishery in lake Manzala, some recommendation were given.
https://ejabf.journals.ekb.eg/article_3465_d41d8cd98f00b204e9800998ecf8427e.pdf
Lake Manzala
Fishery
Stock assessment
catch
effort
yield
ecologly
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
1999-06-01
3
4
565
595
10.21608/ejabf.1999.3466
3466
Original Article
ON THE HELMINTH PARASITES OF THE RED SEA FISHES
Nahed Abdou
1
Samir Biltagy
2
Ameen Ashour
3
Richard Heckmann
4
Fac. of Education, Ain Shams Univ., Cairo, Egypt
Fac. of Education, Ain Shams Univ., Cairo, Egypt
Fac. Science, Ain Shams Univ., Cairo, Egypt
Dept. of Zool. WIDB. BYU-.Provo-Utah. USA
The present investigation provides a list of all helminth parasites infecting 47 species of Red Sea fishes during the period from February to November 1993. About 1400 fishes belonging to 24 families were examined. The helminthes recovered include adult trematodes, larval cestodes, adult and larvae of nematodes, and adult acanthocephala.The prevalence of parasite infections in different fish families in relation to size and sex of their hosts was examined. Seasonality of infection was analyzed to demonstrate the effect of weather on rate of infection. The highest infection rate was recorded during auturnn and the lowest rate during winter. Families' Mugiloididae and Serranidae were the highest fish families susceptible to infection by helminth parasites however, family Siganidae harbored several species of parasites. Nematode infection represented the highest prevalence of infection in the Red Sea fishes.This was followed by the infection of Cestode larvae belonging to family Trypanorhyncha, followed by Trematode infection then Acanthocephalan infections were the lowest in prevalence.
https://ejabf.journals.ekb.eg/article_3466_d41d8cd98f00b204e9800998ecf8427e.pdf
Helminth parasites- Red Sea- Fish