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
3
1
29
10.21608/ejabf.1999.3423
3423
Original Article
BIOMETRIC STUDIES ON TWO SPECIES OF PAGELLUS (FAMILY: SPARIDAE) IN THE EGYPTIAN MEDITERRANEAN WATERS
Wadie F
1
Rizkalla A.
2
Al-Zahaby A
3
El-Serafy S.
4
National Institute of Oceanography & Fisheries, Kayed-Bay,Alexandria, Egypt.
National Institute of Oceanography & Fisheries, Kayed-Bay,Alexandria, Egypt.
Faculty of Science, Zagazig University, Egypt
Faculty of Science, Zagazig University, Egypt
Analysis of fifteen morphometric measurements and their indices for Pagellus erythrinus and Pagellus acarne in the Egyptian Mediterranean waters revealed that in case of Pagellus erythrinus, body depth, girth, maxillary and pre-orbitalindices increase with increasing fish length, while forked length, inter-orbital and eye diameter indices show a decrease with increasing size. Pagellus acarne is characterized by the fact that pre-anal, body depth, girth, maxillary, pre-orbital and eye-diameter indices increase with increasing length. Comparative study of different morphometric indices and test of significance for both species showed that only pre-dorsal and pre-pectoral are significantly different at 5% level, while standard length, pre-anal, body depth, maxillary, girth, pre- orbital, postorbital and inter-orbital are highly significantly different at 1% level. The five (forked length, head length, dorsal, pre-ventral and eye-diameter) are non-significant.Analysis of variance for meristic characters of Pagellus erythrinus showed that there are differences in pectoral fin ray count for fishes at the same length in different regions of the Mediterranean basin.
https://ejabf.journals.ekb.eg/article_3423_d41d8cd98f00b204e9800998ecf8427e.pdf
Biometric studies
Pagellus
Sparidae
Mediterranean 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
3
31
41
10.21608/ejabf.1999.3424
3424
Original Article
REDESCRIPTION OF DIAPHANOSOMA BIRGEI SSP. LACUSTRIS KORINEK, 1981 (CRUSTACEA, CLADOCERA) FROM THE DELTA REGION, EGYPT.
Fadia Heiba
1
Department of Zoology, Faculty of Science, Tanta University.
The subspecies Diaphanosoma birgei lacustirs, was separated from other recorded cladoceran species which were collected from the Delta region, Egypt on certain morphological criteria. This subspecies is distinguished from Diaphanosoma brachyurum and the same subspecies described in populations of America or Europe by Korinek (1981). It is also distinguished from Diaphanosoma birgei recorded in Egypt that was reidentified and described as Diaphanosoma mongolianum. The main taxonomical characters for different species of the genus Diaphanosoma are antennalsetae and spines, marginal spinulation of valves and their inner fold, denticles on sides of postabdomen and the shape of male copulatory appendages.
https://ejabf.journals.ekb.eg/article_3424_d41d8cd98f00b204e9800998ecf8427e.pdf
Taxonomy
Description
Cladocera
Diaphanosoma spp
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
3
43
62
10.21608/ejabf.1999.3425
3425
Original Article
CYTO-EMBRYOLOGICAL CHANGES IN BOTH FERTILIZED AND ARTIFICIALLY ACTIVATED SEA URCHIN EGG AS REVEALED BY IMMUNO-FLUORESCENCE MICROSCOPY
Samia Eissa
1
Zoology Department, Faculty of Science, Tanta University, Tanta, Egypt.
This study traces the morphological appearance and organization of the cytoskeletal machinery for cell division during the first cell cycle of the sea urchin Hemicentrotus pulcherrimus by immunolocalization of tubulin and DNA. Fertilized and artificially activated eggs are compared in terms of their asters, spindle apparatus and arrangement of chromosomes. Anti-tubulin immunofluorescence microscopy is used to demonstrate the organization of these previous structures at approximately 10-15 min intervals from 40 min-postfertilization through first cleavage. The results revealed that the pattern of microtubule organization and the chromosome cycle were identical to great extent in both fertilized and parthenogenetically activated eggs. However, slight differences, which may not be significant in cell division, wereobserved. These differences include the degree of extension and number of astral microtubules, the intensity of staining, and the behaviour and form of chromosome at some stages. The formation of aster microtubule and spindle mitotic apparatus in parthenogenetically activated eggs, in the absence of sperm and its centriole, wasdiscussed.
https://ejabf.journals.ekb.eg/article_3425_d41d8cd98f00b204e9800998ecf8427e.pdf
Microtubules
DNA
Chromosomes
fertilized egg
activated egg
parthenogenesis
Sea Urchin
echinoids
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
3
80
101
10.21608/ejabf.1999.3426
3426
Original Article
EFFECT OF USING DIFFERENT SOURCES OF CARBOHYDRATE IN PRACTICAL DIETS ON THE PERFORMANCE OF NILE TILAPIA OREOCHROMIS NILOTICUS (L) FINGERLINGS
Deyab EL-Saidy
1
Magdy Gaber
2
Department of Poultry Production, Faculty of Agriculture, University of Minufiya, Shebin El-Kom, Egypt.
National Institute of Oceanography and Fisheries, Cairo, Egypt
A10-week feeding trial was conducted in aquaria with (1.93 0.2 g) Nile tilapia (Oreochromis niloticus) fingerlings, to examine the effect of different dietary arbohydrate sources in prepared diets. Corn meal, wheat bran, starch, date palm and akalona were incorporated into experimental rations at isonitrogenous (33.2 % crude protein) and isocaloric (488.6 kcal gross energy /100 g of diet). The results revealed that, there is a significant difference (P 0.01) in the final individual weight, weight gain %, specific growth rate % (SGR), feed conversion ratio (FCR), protein efficiencyratio (PER), net protein utilization (NPU) and feed intake among fish groups. The highest final individual weight, weight gain %, SGR %, feed intake and condition factor (K) were recorded with diet 2, which contained wheat bran, while the best FCR, NPU and FER were obtained in diet 1, which contained corn meal. Body composition of fish flesh(on dry and wet basis %) were significantly different (P 0.01) among treatments. The best results of protein and fat contents were achieved in case of fish fed on diet 2, which contained wheat bran and diet 1 containing corn meal. The sources of carbohydrate in the diet significantly affect the crude protein, fat and energy digestibility coefficients. These results suggest that, wheat bran or corn meal at the 28.5 % level of the diet can efficiently be utilized as anenergy source in ration for Nile tilapia diets, wheat bran being the best.
https://ejabf.journals.ekb.eg/article_3426_d41d8cd98f00b204e9800998ecf8427e.pdf
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
3
81
92
10.21608/ejabf.1999.3427
3427
Original Article
EFFECT OF GRAZING PRESSURE OF ZOOPLANKTON ON PHYTOPLANKTON ASSEMBLAGE IN LAKE QARUN, EL-FAYOUM, EGYPT
Gamal El-Shabrawy
1
Ola Taha
2
National Institute of Oceanography and Fisheries Fish Garden, Algae Lab., Zamalek, Cairo, Egypt
National Institute of Oceanography and Fisheries Fish Garden, Algae Lab., Zamalek, Cairo, Egypt
Lake Qarun is an inland closed saline basin, used as a reservoir for agriculture drainage water. The Zooplankton-Phytoplankton interface was studied through 3 in situ experiments. The major conclusion that can be drawn from this study is that zooplankton play a major role in regulation of phytoplankton biomass in lake Qarun during Summer. The grazing pressure of zooplankton was mainly on the nano & pico phytoplanktonic fraction. Brachionus plicatilis was reported to feedexclusively on Nitzschia sigma and N. frustulum var. perpnsilla.
https://ejabf.journals.ekb.eg/article_3427_d41d8cd98f00b204e9800998ecf8427e.pdf
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
3
63
79
10.21608/ejabf.1999.3428
3428
Original Article
ESTERASE ISOZYMES AND THEIR PROBABLE GENETIC LOCI IN TWO COLOUR MORPHS OF THE FRESHWATER EEL, ANGUILLA ANGUILLA, FOUND IN EGYPT
Mohamed B. Abdelmordy Abdelmordy
1
Tarek Tantawi
2
Zoology Department, Faculty of Science, Ain Shams University, Cairo, Egypt
Genetics Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt
Esterases from different body organs of two colour morphs of the freshwater eel, Anguilla anguilla were extracted and analyzed using starch gel electrophoresis, five substrates and four inhibitors. Eight esterase bands were recognized in both colour morphs. Bands were distributed in two main zones. They exhibited different tissue distribution, and different substrate specificity. As the results of inhibition studies, esterases were classified as carboxylesterases and acetylesterases. Depending on substrate specificity, inhibition characteristics and relative mobility, esterase bandscould be traced to three genetic loci. One locus codes for bands of zone I. The other two loci code for bands of zone II. No significant differences could be found between the two colour morphs.
https://ejabf.journals.ekb.eg/article_3428_d41d8cd98f00b204e9800998ecf8427e.pdf
esterase isozymes
Fishes
Electrophoresis
Polymorphism
genetic loci
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
3
81
92
10.21608/ejabf.1999.3429
3429
Original Article
EFFECT OF GRAZING PRESSURE OF ZOOPLANKTON ON PHYTOPLANKTON ASSEMBLAGE IN LAKE QARUN, El - FAYOUM, EGYPT
Gamal EI-Shabrawy
1
Ola Taha
2
National Institute of Occanography and Fisheries Fish Garden, Algae Lab., Zamalek, Cairo, Egypt
National Institute of Occanography and Fisheries Fish Garden, Algae Lab., Zamalek, Cairo, Egypt
Lake Qarun is an inland closed saline basin, used as a reservoir for agriculture drainage water. The Zooplank – Phytoplankton- interface was studied through 3 in situ experiments.The major conclusion that can be drawn from this study is that zooplankton play a major role in regulation of phytoplaukton biomass in lake Qarun during Summer. The grazing pressure of zoopiankton was mainly on the nano & pico phytoplanktonic fraction. Brachionus plicatilis was reported to ‘feed exclusively on Niizschia sigtna and N. frustulum var. perpnsilla.
https://ejabf.journals.ekb.eg/article_3429_d41d8cd98f00b204e9800998ecf8427e.pdf
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
3
93
115
10.21608/ejabf.1999.3430
3430
Original Article
EFFECT OF DIFFERENT DIETARY PROTEIN LEVELS ON GROWTH BODY COMPOSITION AND RESISTANCE TO AEROMONAS HYDROHILA IN NILE TILAPIA ( OREOCHROMIS NILOCUS)
AIaa EL-Dahhar
1
Fayed A.
2
Department of Animal & Fish Production, Faculty of Agriculture (Saba Basha), Alexandria University. Po Box 21531 Bolk!y.
Department of Animal & Fish Production, Faculty of Agriculture (Saba Basha), Alexandria University. Po Box 21531 Bolk!y.
The effects of dietary protein level on growth perfonnance and resistnce to Aeromonas hydrophila of Nile tilapia (Oreochromis niloticus) were determined in glass aquaria. Apparently healthy specinens of the Nile tilapia (31 g initial body weight) were used in a feeding experiment with five dietary protein levels. Three random groups of ten fish per glassaquaria were maintained at each treatment The diets were formulated from commercial ingredients to contain the five dietary crude ltotein levels (14, 20, 26, 32 and 38%) and 245 kcal metabolizabte energy /100g using soybean meal and fishmeal in a fixed ratio (2:1). Fish were fed twice daily for 12 weeks. After the feeding experiment, five fish were per treatment were randomly picked up for intra peritoneal injection with 0.1 ml of formalin inactivated hot-strain of isolated Aeromonas hydrophila. Two weeks later fish were intramuscularly challenged with 0.1 ml /fish containing approximately 9x 10 7 cells of viable homologous virulent strain of A hydrophila. Challenged fish from each treatment were kept underobservation for 7 days post-challenge. Results revealed that increasing dietary protein level had no significant effect on the final body weight. Energy retention (ER) of fish fed 26% dietary protein level was higher (P<0.05) than those received 32 and 38%. Also feed conversiosj ratio (FCR) improved with increasing dietary protein level up to26%. But proteinefficiency ratio (PER) and protein productive value (PPV) decreased significantly (P<0.05) with increasing dietary protein level. No significant differences among the feeding treatments were occurred in survival rate. The intramuscularly challenged fish with virulent strain of I A. hydrophila were showed hemorrhage ulceration at the inoculation sites. Fish that maintained at 26% dietary protein level obtained the higher level of antibody protection. Low mortality and morbidity was observed on fish maintained at 26% dietary protein level. Generally, it can be concluded that even if the low protein levels gave the same growth performance, we can recommend 26% dietary protein level for the best growth and resistance to A. hydrophilic infection.
https://ejabf.journals.ekb.eg/article_3430_d41d8cd98f00b204e9800998ecf8427e.pdf
Dietary protein
growth- resistance
Aeromonas hydrophila
Oreochromis niloticus
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
3
117
135
10.21608/ejabf.1999.3431
3431
Original Article
OCCURRENCE` AND DISTRIBUTION OF SOME HEAVY METALS IN WATER AND SOME FISHES IN THE GULF OF SUEZ
Mohamed Hamed
1
The National Institute of Oceanography and Fisheries, Suez and Aqaba Gulfs Branch, Egyqpt
Concentration and distribution of dissolved and particulate metals were studied in samples of water and fishes from fifteen locations in the Gulf of Suez during December, 1998. The concentration of dissolved heavy metals ranged between0.62-4.22, 1.45-9.36, 0.31-2.35, 0.177-1.369, 0.139-1.506, 0.412-3.520, 0.225-0.981 and 0.386-2.901 g/l for Cu, Zn, Pb, Cd, Cr, Ni, Co and Mn respectively. In the same respect, the corresponding values for particulate metals were 0.23-2.17, 0.51-5.33, 0.12-1.64, 0.047-0.514, 0.112-1.075, 0.191-1.650, 0.103-0.728 and 0.132-1.876 g/l. The bioaccumulation of some metals in the edible muscles and organs (liver, gills, gonad, bone, skin and kidney) of some economic fishes in the Gulf of Suez namely Saurida undosquamis, Pomadasys stridens and Sardinella gibbosa was studied. The present data indicate that Cu, Cr and Mn concentrations exhibited their highest level in liver, zinc in gonad, Pb and Cd in bone, while Co and Ni in gills. The highest accumulated metals were Zn and Mn, while the lowest one was Cd. The accumulation was more pronounced in Saurida undosquamis than Pomadasys stridens and Sardinella gibbosa. The industrial run off was the main responsible factor for contributing most metals contamination. The area receives considerable amount of effluents from many industries such as petrochemical factories and refineries especially at the northern part of Suez Bay.
https://ejabf.journals.ekb.eg/article_3431_d41d8cd98f00b204e9800998ecf8427e.pdf
Heavy metals
fish
water
Gulf of Suez
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
3
137
158
10.21608/ejabf.1999.3432
3432
Original Article
GROWTH RESPONSE OF NILE TILAPIA FRY (OREOCHROMIS NILOTICUS) FED DIETS CONTAINING DIFFERENT LEVELS OF PROTEIN.
El-Saidy D.
1
Gaber A.
2
Magouz I.
3
Department of Poultry production, Faculty of Agriculture, University of Minufiya, Shebin El-Kom, Egypt.
National Institute of Oceanography and Fisheries, Cairo, Egypt
Department of Animal production, Kafr El-sheikh, Faculty of Agriculture,Tanta University
Four hundred and fifty of Nile tilapia fry (Oreochromis niloticus) with 0.9 0.1 g initial average body weight were used in a feeding trial to study the effect of different protein levels on growth performance and feed efficiency of the fish.Five isocaloric diets were formulated to contain 28, 30, 32, 34 and 36 % protein and P/E ratio ranged from 81 to 98 mg protein / Kcal digestible energy. Fish were fed the experimental diets at a rate of 5 % of the body weight daily in glass aquaria containing 80 liters in each for a period of 12 weeks. The results indicated that body weight gain and feed conversion ratio (FCR) were improved as dietary protein level increased. Protein efficiency ratio (PER) increased with increasing protein level in the diet. P/E ratio was correlated positively with weight gain, feed consumption and specific growth rate (SGR) (r = 0.98, 0.99 and 0.96, respectively) and negatively with feed conversion ratio (FCR), r = - 0.89.Positive relationship between body weight gain and feed consumption was also obtained (r = 0.99).The results showed that there were no significant differences (P 0.05) among groups of fish fed diets C, D, and E. It can be suggested that the optimum protein level required for high growth rate and best feed utilization reaches be 32 % at P/E ratio of 91 mg protein /Kcal digestible energy.
https://ejabf.journals.ekb.eg/article_3432_d41d8cd98f00b204e9800998ecf8427e.pdf
missed
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
3
159
180
10.21608/ejabf.1999.3433
3433
Original Article
EFFECTS OF DIETARY ENERGY LEVEL ON GROWTH, FEED CONVERSION, BODY COMPOSITION, DIGESTIBILITY COEFFICIENTS AND ENERGY BUDGET OF NILE TILAPIA (OREOCHROMIS NILOTICUS).
El-Saidy D.
1
Gaber A
2
Magouz I.
3
National Institute of Oceanography & Fisheries, Cairo, Egypt
Department of Animal Production, Kafer-El-Sheikk Agri.,Tanta Univ.,Egypt
Aone way experiment was conducted with Nile tilapia, Oreochromis niloticus, using restricted feeding with 4280, 4370, 4520, 4660, 4800 and 4860 Kcal / kg diet of dietary energy concentration with isonitrogenous contant (33 % crudeprotein). Diets were fed to triplicate random groups of 30 fry for 84 day in glass aquaria. At a constant dietary protein level, weight gain and protein efficiency ratio increased with increasing dietary energy level. The body fat content of theexperimental fish increased with the increaseing of dietary energy level. Fish fed diets E and F (4800 and 4860 Kcal/kg) had significantly higher fat content than those of fish fed all other diets. Protein productive value (PPV) of Nile tilapia given diet containing 330 g protein and 4800 kcal /kg diet was significantly higher than those of fish fed all other dietary energy levels. Dietary energy levels correlated positively with weight gain, body length, body weight, SGR and total feed intake, (r = 0.91, 0.91, 0.92, 0.92, 0.92) and negatively with feed conversion ratio (FCR) and PER (r = - 0.90 and - 0.86). The apparent digestibility coefficients for dry matter, protein and lipid were significantly affected by dietary energy levels while, digestibility of energy was not significantly affected by energy levels. The energy budget at the restrictedfeeding was 100 IE = 14.9 FE + 5.79 (ZE + UE) + 63.37 HE + 15.94 RE, where IE, FE, (ZE + UE), HE and RE represented gross energy intake, fecal energy, excretory energy loss, heat production and growth energy, respectively. It can be suggesed that dietary energy of 4800 Kcal GE / kg or 4000 Kcal DE / kg diet with a constant dietary protein of 33.0 % was superior to high growth rate and best food utilization of juvenile Nile tilapia under the conditions of this study.
https://ejabf.journals.ekb.eg/article_3433_d41d8cd98f00b204e9800998ecf8427e.pdf
Growth
feed
body composition
Orechromis niloticus
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
3
179
194
10.21608/ejabf.1999.3434
3434
Original Article
EFFECT OF THE HERBICIDE AMETRYN ON GROWTH AND METABOLIC ACTIVITIES OF SCENEDESMUS QUADRICAUDA, STAURASTRUM NATATOR AND MICROCYSTIS FLOS-AQUAE
Ola Taha
1
National Institute of Oceanography and Fisheries Inland Water and Aquaculture Branch.
9 6-h bioassay experiments were conducted in order to investigate the influence of the herbicide Ametryn on growth and metabolic activities of three freshwater microalgae, namely Scenedesmus quadricauda (Trup) de Brebisson, Staurastrumnatator (W.west) (Chlorophyceae) and Microsystis flos-aquea (wittr) Elenkin (Cyanophyceae). The EC50 values of the herbicide Ametryn for inhibiting growth,chlorophyll a dry weight, carbohydrate lipids and protein were determined. The three tested algae and their tested parameters varied greatly in their response to metryn. Scenedesmus quadricauda was the most susceptible species to Ametryn while - aquae was the most tolerant. Lipid proved to be the tolerant parameter to Ametryn in comparison with the other physiological parameters
https://ejabf.journals.ekb.eg/article_3434_d41d8cd98f00b204e9800998ecf8427e.pdf
Ametryn
Growth
scenedesmus
Microcystis
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
3
195
216
10.21608/ejabf.1999.3435
3435
Original Article
EFFECT OF USING DIFFERENT SOURCES OF CARBOHYDRATE IN PRACTICAL DIETS ON THE PERFORMANCE OF NILE TILAPIA, Oreochromis niloticus (L) FINGERLINGS
EL-Saidy D.
1
Gaber A
2
Department of Poultry Production, Faculty of Agriculture, University of Minufiya, Shebin El-Kom, Egypt
National Institute of Oceanography and Fisheries, Cairo, Egypt
A10-week feeding trial was conducted in aquaria with (1.93 0.2 g) Nile tilapia (Oreochromis niloticus) fingerlings, to examine the effect of different dietary carbohydrate sources in prepared diets. Corn meal, wheat bran, starch, date palmand akalona were incorporated into experimental rations at isonitrogenous (33.2 % crude protein) and isocaloric (488.6 kcal gross energy /100 g of diet). The results revealed that, there is a significant difference (P 0.01) in the final individual weight, weight gain %, specific growth rate % (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER), net protein utilization (NPU) and feed intake among fish groups. The highest final individual weight, weight gain %, SGR %, feed intake and condition factor (K) were recorded with diet 2, which contained wheat bran, while the best FCR, NPU and FER were obtained in diet 1, which contained corn meal. Body composition of fish flesh (on dry and wet basis %) were significantly different (P 0.01) among treatments. The best results of protein and fat contents were achieved incase of fish fed on diet 2, which contained wheat bran and diet 1 containing corn meal. The sources of carbohydrate in the diet significantly affect the crude protein, fat and energy digestibility coefficients. These results suggest that, wheat bran or corn meal at the 28.5 % level of the diet can efficiently be utilized as an energy source in ration for Nile tilapia diets, wheat bran being the best.
https://ejabf.journals.ekb.eg/article_3435_d41d8cd98f00b204e9800998ecf8427e.pdf
carbohydrate
practical diets
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
3
217
243
10.21608/ejabf.1999.3436
3436
Original Article
MONTHLY VARAITIONS AND SUCCESSION OF ROTIFERA IN WADI ELRAYAN AREA IN RELATION TO SOME PHYSICAL AND CHEMICAL CONDITIONS
Gamal El-shabrawy
1
National Institute of Oceanography & Fisheries , El-Kanater Fish Research Station, El-Kanater El-Kyryia, , Egypt
In Wadi El-Rayan area, two successiv lakes at different levels were created as a reservoir for drainage wastewater from agriculture lands. In the area under investigation rotifers were represented by 34 species,of which 6 were recorded forthe first time, namely:Brachionus falcutus, Monostyla quadridentata, Lecane ledwigi, transparency, dissolved oxygen and chlorosity seem to be the most important factors controlling succession of these rotifers in Wadi El-Rayan area. Generally, rotifers were well represented in the two lakes, as compared with the situation in the other areas. Statistical analysis showed a highly similarity index (45.2) between El-Wadi drain and El-Banat canal, followed by first lake and connecting channel (34.3). The second lake revealed the lowest similarity index with other sites and sustained the lowest richness and equitability values of 1.93 and 0.35, respectively.
https://ejabf.journals.ekb.eg/article_3436_d41d8cd98f00b204e9800998ecf8427e.pdf
Rotifera
Wadi El-Rayan
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
3
245
258
10.21608/ejabf.1999.3437
3437
Original Article
BIOMETRIC STUDY ON MUGGIAEA ATLANTICA CUNNINGHAM AND MUGGIAEA KOCHI (WILL) (DIPHYIDAE,CALYCOPHORAE) FROM THE FRENCH MEDITERRANEAN COAST
Mohamed Dowidar
1
National Institute of Oceanography and Fisheries, Kayet-bey, Alexandria,Egypt.
Genus Muggiaea (Diphyidae, Calycophorae) comprises four species namely: Muggiaea kochi (will,1844); M. atlantica Cunningham, 1892; M. baramannae Totton, 1954 and M. delsmani Totton, 1954. In the Mediterranean Sea, only M.atlantica & M. kochi have been reported. The differentiation between these species depends on the lengths of the somatocyst and the nectophore, and the depth of the hydroecium. The present study is a biometric test of the taxonomic criteria defined for these siphonophores by Totton, which shows that the ratio between the lengths of the somatocyst and the nectophore is essential to the identification of M. kochi & M. atlantica that were obtained from the French Mediterranean waters.
https://ejabf.journals.ekb.eg/article_3437_d41d8cd98f00b204e9800998ecf8427e.pdf
Biometry
Muggiaea atlantica
Muggiaea kochi
Nectophore
Somatocyst
Hydroecium
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
3
259
278
10.21608/ejabf.1999.3438
3438
Original Article
A REVIEW OF THE TREMATODE GENERA HAPLOPORUS LOOSS,1902 DICROGASTER LOOSS, 1902 AND SACCOCOELIOIDES SZIDAT, 1954 WITH REDESCRIPTION OF THREE SPES CIS FROM MULLET IN LIBYA
Dayhoum AL-Bassel
1
Department of Zoology, Faculty of Science, Cairo University, Fayoum Branch
In the present work, three trematode genera: Haploporus Looss, 1902, Dicrogaster Looss, 1902 and Saccocoelioides Szidat, 1954 were reviewed. Haploporus lateralis Looss, 1902, D. fastigatus Thatcher and Sparks 1958 and S. pearsoni, Martin, 1973 were redescribed from the mullet Liza ramada from Libya. This represent a new host record and new locality. A comparison between the previous results and the present work is presented and discussed. A key was suggested to distinguish between the known species of the two genera Dicrogaster Looss, 1902 and Haploporus Looss, 1902.
https://ejabf.journals.ekb.eg/article_3438_d41d8cd98f00b204e9800998ecf8427e.pdf
Trematoda
Digenea
Haploporidae
Parasites
Fishes