eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
2015-04-01
19
2
1
11
10.21608/ejabf.2015.2252
2252
Original Article
Effect of pollution on macrobenthic invertebrates in some localities along the River Nile at Great Cairo, Egypt.
Abd El-Halim Saad
1
Waheed Emam
2
Hesham Mola
3
Hadeel Omar
4
Zoology department, Faculty of science, Ain Shams University, Cairo, Egypt.
Zoology department, Faculty of science, Ain Shams University, Cairo, Egypt.
National Institute of Oceanography and Fisheries (NIOF), El-Qanater.
Zoology department, Faculty of science, Ain Shams University, Cairo, Egypt.
The impact of heavy metals on macrobenthic invertebrates in five stations alongthe River Nile at Great Cairo (from Helwan to El-Qanater El-Khiria) was studiedduring the period from May, 2013 to February, 2014. Physico-chemical characteristicsand heavy metals (iron, manganese, zinc, copper and cadmium) were analyzed inwater. The highest average number (2305 org./m2) of macrobenthic invertebrates wasrecorded during spring, while the lowest (642 org./m2) was recorded during summer.Annelida, Mollusca and Arthropoda were the most dominant groups being 62 %, 34% and 4 % respectively. Twenty two species and taxa were recorded; Mollusca (13species) and Annelida (7 species) Arthropoda (2 species).All the heavy metal concentrations were within the permissible limits except atHelwan and Hawamdia due to the effect of discharged industrial wastes. The highestpositive correlation was recorded between Arthropoda and iron & zinc, while ironrecorded a negative correlation with Mollusca and Annelida. The principal componentanalysis (PCA) showed that the most dominant annelid Limnodrilus spp. had apositive correlation with cadmium and negative correlation with all other heavymetals. This indicates that this species can resist the high concentrations of cadmium
https://ejabf.journals.ekb.eg/article_2252_ea6e16026ff828159bf6b3120049d1c5.pdf
Macrobenthic invertebrates
Heavy metals
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
2015-04-01
19
2
13
20
10.21608/ejabf.2015.2253
2253
Original Article
Critical lengths, mortality rates and relative yield per recruit of the common sole Solea solea from the Egyptian Mediterranean coast off Alexandria
Sahar Mehanna
1
Noha Aid
2
Mohamed Abo Elregal
3
Fish Population Dynamics Lab, National Institute of Oceanography and Fisheries, Egypt
Fish Population Dynamics Lab, National Institute of Oceanography and Fisheries, Egypt
Marine Sciences Department, Faculty of Science, Port Said University, Egypt.
Mortality rates of the common sole Solea solea from Alexandria were estimatedbased on the von Bertalanffy growth parameters obtained by the same authors as L∞= 34.77cm; K= 0.55 year−1 and t0 = 0.07 years for males, L∞ = 36.24 cm; K= 0.63year−1, t0 = -0.01 years for females and L∞ =35.1 cm; K= 0.58 year−1 and t0 = 0.003years for sexes combined during two fishing seasons (2011-2013). The total, naturaland fishing mortalities were 2.09, 0.52 and 1.57 year−1 respectively for males, 1.75,0.53 and 1.22 year−1 respectively for females and 1.7, 0.52 and 1.18 year−1respectively for sexes combined. Correspondingly, the exploitation ratio was E =0.75, 0.7 and 0.69/y for males, females and sexes combined respectively. Theestimated length at first capture Lc was 15.97, 12.72 and 14.22 cm for males, femalesand sexes combined, respectively while the length at first maturity Lm was 15.31,15.87 and 15.98 cm for males, females and sexes combined, respectively. Theseresults reflect the high level of the exploitation. The relative yield per recruit analysisshowed that the stock of S. solea is over exploited and needs urgent managementregulations to conserve this potential fishery.
https://ejabf.journals.ekb.eg/article_2253_43224a77d9bd98c4a77f4f55c61d1488.pdf
alexandria
Soleidae, Solea solea, Mortality rates
per-recruit analysis
fisheries,management
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
2015-04-01
19
2
21
28
10.21608/ejabf.2015.2254
2254
Original Article
Seasonal occurrence and distribition of brachyuran crabs caught along the Suez Canal, Egypt.
Marwa Osman
1
Fedekar Madkour
2
Wafaa Sallam
3
Saad Mohammed
4
Department of Marine Sci., Fac. of Sci., Port Said Univ., Port Said, Egypt
Department of Marine Sci., Fac. of Sci., Port Said Univ., Port Said, Egypt
Department of Marine Sci., Fac. of Sci., Suez Canal Univ., Ismailia, Egypt.
Department of Marine Sci., Fac. of Sci., Suez Canal Univ., Ismailia, Egypt.
The present study aimed to document the brachyuran crab fauna caught byfishing nets operating in the Suez Canal and study their occurrence and seasonaldistribution along the canal during the period from April 2011 to March 2012. Fivesampling locations were selected representing the known landing sites along thecanal. Eleven species of crabs belonging to nine families were recorded, of themDorippe quadridens and Cryptodromia hilgendorfi are recorded for the first time inthe Suez Canal. The blue swimming crab Portunus pelagicus was the most distributedspecies in the study sites, followed by the spider crab Hyastenus hilgendorfi, whileColeusia signata and Cryptodromia hilgendorfi were the least common species. Thepresent study discussed the seasonal occurrence and distribution of the recordedspecies and compared them with the previous studies conducted on the Suez Canal.The study recommended continuous monitoring of the brachyuran crabs faunatogether with other crustaceans inhabiting the canal in order to provide an updatedinventory and establish a database for the fauna of this unstable environment.
https://ejabf.journals.ekb.eg/article_2254_b4d1914a0e2a6835f747b7f17550a605.pdf
Brachyuran crabs
Distribution
occurrence
Suez Canal
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
2015-04-01
19
2
29
41
10.21608/ejabf.2015.2255
2255
Original Article
Applying some biotic indices of macrobenthic invertebrates to assess water quality of Lake Manzala, Egypt
Mohamed . Fishar
1
National Institute of Oceanography and Fisheries, Cairo, Egypt
Water and macrobenthic invertebrate (MBI) samples were collected from nine stations of Lake Manzala during spring (May, 2014) and summer (August, 2014). Chemical parameters e.g. Dissolved Oxygen, Biological Oxygen Demand, TotalDissolved Solids, Ammonia, Nitrite, Orthophosphorus, Total Suspended Solids were measured for Nile Chemical Pollution Index (NCPI). Macrobenthic invertebrates were sorted, counted and identified for Biological Monitoring Working Party (BMWP) and Nile Biotic Pollution Index (NBPI) was conducted. The highest number of macrobenthic invertebrates and the best water quality was observed at the stations away from the source of pollution (Legan and Boom Station), while the lowest water quality and the lowest number of species were observed at Bahr El-Bakar and its discharged point.The present study revealed that, the average score of NCBI was ranged between 33 during spring and 29 during summer, indicating heavily polluted ranges (26-35). In this work, 19 MBI species under 18 families were recorded; out of these 8 families are bioindicatory families (Viviparidae, Planorbidae, Lymnaeidae, Thiaridae, Physidae,Neritidae, Tubificidae and Chironomidae) which used in the applied biotic indices. During spring, the average value of NCBI recorded high score, whereas BMWP-ASPT and NBPI-ASPT were decreased being 2.99 and 2.59 respectively. On the other hand during summer, the average value of NCBI recorded low score whereas BMWP-ASPT and NBPI-ASPT were increased. Regression values between the chemical index (NCBI) and BMWP-ASPT Index and NBPI Index showed a nonsignificant values (p value more than 0.05) during spring and summer. So, the presentstudy concluded that, BMWP-ASPT and NBPI-ASPT Indices did not show a good indication to assess water quality of Lake Manzala and they were not matching with chemical index (NCBI) and more developments to these indices are needed to developthem according to the nature of the lake and their dominant macrobethic indicator species
https://ejabf.journals.ekb.eg/article_2255_4744b2852d7e1b38b56967ade80cc123.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
2015-04-01
19
2
43
58
10.21608/ejabf.2015.2256
2256
Original Article
Effect of the farm operations for wheat cultivation in fish ponds on the growth performance and total yield of Nile tilapia (Oreochromis niloticus)
Ahmed El-Bab1
1
Mohamed Mostafa
2
Mohamed Shehab El-Din
3
Amal Hassan
4
Central Laboratory for Aquaculture Research, Agriculture Research Center. Fish production Department.
Central Laboratory for Aquaculture Research, Agriculture Research Center. Fish production Department.
Central Laboratory for Aquaculture Research, Sakha Aquaculture Research Unit. Fish diseases Department.
Central Laboratory for Aquaculture Research, Agriculture Research Center. Fish production Department.
This study aimed to investigate the effect of farming operations for wheat production in fish ponds on growth and vitality for Oreochromis niloticus. Six earthen ponds (4200 m²) were used in this study. Fish farming showed two successive seasons followed by cultivating of wheat in the winter period. Fish farming of O. niloticus in the first season began on 17/5/2012 up to 18/10/2012 then cultivated by wheat on 8/11/2012 up to 8/05/2013 and thereafter stocked by O. niloticus on 25/5/2013 up to 25/10 /2013. O. niloticus fish were fed on a diet containing 25% crude protein. Wheatculture was exposed to three treatments (two replicates for each treatment). The firsttreatment (T1) wheat was cultured without any fertilizers, while in the second treatment (T2) wheat was cultured with inorganic fertilization and in the thirdtreatment (T3) wheat was cultured with organic fertilization. O. niloticus fingerlings averaging 30.20g in weight in first year and 30.63g for the second year at stocking rate (12000 fingerlings/feddan). Results obtained can be summarized as following: Season of aquaculture: the second season recorded the highest averages of bodyweight (BW), body length (BL), condition factor (K), daily weight gain (DWG) and specific growth rate (SGR).Treatments: The third treatment (T3) O. niloticus recorded the highest ranges of body weight (BW), body length (BL), condition factor (K), daily weight gain (DWG) and specific growth rate (SGR).Wheat culture: second treatment (T2) recorded the highest ranges of total weight of Wheat crop.Based on the results obtained in this study and from the economical evaluation, it could be concluded that, Wheat cultivation in ponds during the winter period taking into account organic and inorganic fertilization for wheat crop, feeding O. niloticus on artificial feed containing 25% crude protein increased the weights of fish, as well asincreased the yield of wheat production from fish ponds in addition to that it was bestin terms of economic efficiency compared to other treatments
https://ejabf.journals.ekb.eg/article_2256_05917b08a912150ec4fb4b62ced7fc98.pdf
fish ponds
cultivation of wheat
Growth performance
Nile tilapia
O. 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
2015-04-01
19
2
59
64
10.21608/ejabf.2015.2257
2257
Original Article
Age and growth of the common sole, Solea solea from the Egyptian Mediterranean Coast of Alexandria
Sahar Mehanna
1
Noha Aid
2
Mohamed Abo Elregal
3
Fish Population Dynamics Lab, National Institute of Oceanography and Fisheries, Egypt
Fish Population Dynamics Lab, National Institute of Oceanography and Fisheries, Egypt
Marine Sciences Department, Faculty of Science, Port Said University, Egypt
The study of the age and growth of individuals in a population is very importantfor understanding the general biology of the species and in particular the populationdynamics. Age and growth of the common sole, Solea solea from Alexandria werestudied based on the whole otolith readings using a non-linear back-calculationmethod during two fishing seasons (2011-2013). A total of 1558 S. solea (11.9 – 34.1cm total length) were aged and the maximum life span was 4 years for both sexes. Itwas found that the age group one was the most frequent age group in the catchforming 65.8% of the total sampled specimens for male and female. The vonBertalanffy growth parameters obtained by using the back-calculated lengths were L∞= 34.77 cm; K= 0.55 year−1 and t0 = 0.07 years for males and L∞ = 36.24 cm; K= 0.63year−1 and t0 = -0.01 years for females. The results showed that the stock of S. soleaneeded to assess in the wise management of this potential fishery. It is also clear thatS. solea in Alexandria was considered one of the overfished species with a greaterneed for conservation.
https://ejabf.journals.ekb.eg/article_2257_c2728af74138e45a017a506278b59edd.pdf
Soleidae
Solea solea
age and growth
otolith
Population dynamics
anagement
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
2015-04-01
19
2
65
72
10.21608/ejabf.2015.2258
2258
Original Article
Yeast fermented sunflower meal as a replacer for fish meal in diets of the Nile tilapia, Oreochromis niloticus
Magdy Soltan
magdyasoltan@yahoo.com
1
Mohammed Abdella
2
Mohammed Hassaan
3
Mohammed El-Ashry
4
Gamal El-Syaad
5
Department of animal production, Faculty of Agriculture, Benha, University, Egypt
Department of animal production, Faculty of Agriculture, Benha, University, Egypt
Aquaculture division, National Institute of Oceanography and Fisheries (NIOF) Egypt
Department of animal production, Faculty of Agriculture, Benha, University, Egypt
Department of animal production, Faculty of Agriculture, Benha, University, Egypt
This study aimed to improve the nutritional value and utilization of sunflowermeal (SFM) used as feed ingredient for tilapia by an approach of solid-statefermentation with Saccharomyces cerevisiae. The protein content and lipid contentwas increased, while phytic acid and tripsin inhibitor were decreased duringfermentation. Dietary fish meal was replaced with yeast fermented sunflower meal(YFSFM) in four isonitrogenous (297 g/ kg crude protein and isocaloric 19.6 MJ/ kggross energy) diets. Fish meal was replaced with YFSFM in the experimental diets infour levels 0, 25, 50 or 75% to formulate four experimental diets (control diet), D1,D2, D3 and D4, respectively. Each diet was fed to triplicate groups of fish with aninitial weight 10.30 ±0.12 g for 84 days. The highest final body weight (FBW),weight gain (WG), specific growth rate (SGR) and the best condition factor (K) wereobtained with D1 and D2. The lowest growth response was obtained with D4.Generally, a positive protein substitution effect was observed at 25% substitutionlevels (D2). The highest feed intake (FI) g/fish and the best feed conversion ratio(FCR) and protein efficiency ratio (PER) were recorded for fish fed D1 and D2, withvalues statistically different from the other treatments. Fish fed different levels ofYFSFM did not have a significant impact on dry matter, lipid, crude protein and ashcontents of the fish.
https://ejabf.journals.ekb.eg/article_2258_d41d8cd98f00b204e9800998ecf8427e.pdf
Sunflower meal
Solid state fermentation
Growth
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
2015-04-01
19
2
73
87
10.21608/ejabf.2015.2259
2259
Original Article
Effect of some water sources on growth performance of Nile tilapia (Oreochromis niloticus) and Grey mullet (Mugil cephalus)
Mohamed Shehab El-Din
1
Ahmed El-Bab
2
Ibrahim, Samra
3
Amal, Hassan
4
Central Laboratory for Aquaculture Research, Sakha Aquaculture Research Unit. Fish diseases Department, Egypt.
Central Laboratory for Aquaculture Research, Agriculture Research Center. Fish production Department, Egypt.
Central Laboratory for Aquaculture Research, Agriculture Research Center. Fish production Department, Egypt.
Central Laboratory for Aquaculture Research, Agriculture Research Center. Fish production Department, Egypt.
The present experiment was carried out to study the impact of water sources oncultured Nile tilapia; Oreochromis niloticus and Grey mullet; Mugil cephalus. Sixearthen ponds (1 feddan for each) were used in this experiment in three different farmsin the same area. Three treatments were tested in two replicates (2 ponds), thereforesix ponds were stocked with O. niloticus (9000 fish/pond) and (3000 fish/pond) ofGrey mullet for each pond. O. niloticus and M. cephalus fingerlings averaged 37.18,38.14 and 36.56g for O. niloticus and 23.69, 21.89 and 22.15g for M. cephalus inweight were assigned randomly to the three treatments. The first experimental pondsgroup was supplied by underground water, while the second group was supplied byagricultural drainage water and finally, the third ponds group were irrigated by amixture between underground water and drainage waste water. The growth experimentperiod lasted for 26 weeks and the obtained results indicated that, the third pondsgroup showed the best regarding health and growth of cultured fishes.Though water performance quality characteristics differ between undergroundwater and agricultural drainage water, but both sources are considered suitable foraquaculture. And ground water and mixture between underground water and drainagewater are gave the best of final weights and the highest total yields and quite safe forhuman consumption.
https://ejabf.journals.ekb.eg/article_2259_5cc1991a893b5ffd743d98937f5c3db7.pdf
Grey mullet
Mugil cephalus
Nile tilapia
Oreochromis niloticus
Aquaculture
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
2015-04-01
19
2
89
100
10.21608/ejabf.2015.2260
2260
Original Article
Accumulation of some heavy metals and its effect on hematological indices of fresh water fish, Oreochromis niloticus
El-Sayed El-Sayed
1
Central Laboratory for Environmental Quality Monitoring, National Water Research
Accumulation of some heavy metals (copper, iron, manganese, nickel and zinc) and its effect on the hematological indices on the freshwater fish (Oreochromis niloticus) were studied. Fish Samples were collected from the River Nile near El- Kanater El-Khyria and contaminated water from Iron and Steel Basin in El-Safe Village near Helwan, south of Cairo. Results of this study showed that there was a significant difference between the water qualities indices among the two different locations. Meanwhile, fish samples that collected from polluted location showed high values for the hematological indices namely hemoglobin (Hb), red blood count (RBC), hematocrit (Hct), white blood cell count (WBC) and erythrocyte. Moreover, the concentrations of heavy metals were also high in the fish. However, the levels ofthe heavy metal accumulation were within the maximum permissible limit for human consumption (FAO, 1992). The order of bioaccumulation of such metals in the liver of fish were Fe > Zn> Cu > Mn > Ni. It was concluded for this study that the discharge of different types of wastes, especially heavy metals from washing processof Iron and Steel in Helwan Company deteriorated the water quality and consequently affecting the fish. It is recommended to treat the different wastes before discharging to Iron and Steel Basin in ElSafe Village.
https://ejabf.journals.ekb.eg/article_2260_e1586f33037e93bfd8f9c39a251e3a63.pdf
Heavy metals
fish
Accumulation
hematology
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
2015-04-01
19
2
101
116
10.21608/ejabf.2015.2261
2261
Original Article
Population dynamics of the freshwater crayfish Procambarus clarkii (Girard,1852) in the River Nile, Egypt
Abd El-Halim Saad
1
Sahar Mehanna
2
Magdy Khalil
ejabf2017@gmail.com
3
Mohamed Said
4
Department of Zoology, Faculty of Science, Ain Shams University, Cairo, Egypt.
National Institute of Oceanography and Fisheries, Suez, Egypt
Department of Zoology, Faculty of Science, Ain Shams University, Cairo, Egypt
Department of Zoology, Faculty of Science, Ain Shams University, Cairo, Egypt
The red swamp crayfish, Procambarus clarkii was introduced into the RiverNile in the early 1980s and has become a resident in the Egyptian freshwaterecosystems, but up till now no detailed study has been done to know its stock or evenits population dynamic in the River Nile.The population dynamical parameters of Procambarus clarkii were estimatedduring the period from 2009 to 2012; based on 3465 specimens (1455 males and 2010females) (7.0 – 15.0 TL), collected from two locations along the River Nile. It wasfound that this species attains its highest growth rate during the first six months oflife, after which, the increment in length is decreased with the further increase in age.The growth of this species is isometric based on the b-value of length weightrelationship. From the length frequency distribution analysis, the populationparameters for combined sexes were: asymptotic length L∞ = 16.45cm TL, growthcoefficient K = 1.60/y, instantaneous total mortality Z = 3.65/y for male and 5.60/y forfemale, natural mortality M = 2.28/y for male and 1.91/y for female, fishing mortalityF = 1.37/y for male and 3.69/y for female, exploitation ratio E = 0.38 /y for male and0.66/y for female, length at first capture Lc = 9.11 and 9.25 cm TL for males andfemales, respectively. The relative yield per recruit (Y'/R) and relative biomass perrecruit (B'/R) analysis for P. clarkii in the River Nile gives a maximum (Y'/R) at E=0.70 and the exploitation level which maintains the spawning stock biomass at 50% ofthe virgin spawning biomass E0.5 was estimated as 0.37. This indicates that there is achance to expand the red swamp crayfish fishery by increasing the current E to thatwhich gives the maximum Y'/R but raising the exploitation ratio to that level will notbe reasonable and will be associated with a very little portion of yield. So, keeping theexploitation ratio at its current value or reducing it to E0.5 value (E= 0.37) to achievemore economic return
https://ejabf.journals.ekb.eg/article_2261_ebbc962640a22bc23daac12ef86e2b2e.pdf
Procambarus clarii
Population dynamics
freshwater crayfish
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
2015-04-01
19
2
117
124
10.21608/ejabf.2015.2262
2262
Original Article
Assessment of burrowing behavior of Procambarus clarkii, in Fatmia Drain,Sharqya Governorate, Egypt; Case Study Overview
Magdy Khalil
ejabf2017@gmail.com
1
Mohammed Fishar
2
Khadra Mohammed
3
Faculty of Science, Ain Shams University, Cairo, Egypt.
National Institute of Oceanography and Fisheries, Egypt
National Water Research Center, Environment and Climate Research Institute, Egypt
The invasive Red swamp crayfish Procambarus clarkii was introduced in early 1980s into the Egyptian freshwater system for aquaculture from the United State of America. It has been, since, rapidly expended in all aquatic ecosystems including streams, ponds, and marshes; in polluted or clean waters. P. clarkii successfully adapted to Egyptian water streams and became an important component of the local aquatic fauna. It dispersed in fields and water canals through digging tunnels and burrows. Types of burrows and burrowing behavior of P. clarkii were assessed in Fatmia Drain in Dyarb-Negm, Zakazek Center, Sharkya Governorate, Egypt. These burrows were recorded in many crops fields. Damage to levees structure and banks was depending on P. clarkii densities and its burrowing behavior. Each burrow entrance was represented by the earth "castle". The average number of burrows varied from 25 to 40 burrows / m2 in poorly structured small channel banks of the study area. Burrowing behavior of P. clarkii triggered damage for levees and irrigation structures of small channels that forced the Ministry of Water Resources and Irrigation to periodical pitching those banks.
https://ejabf.journals.ekb.eg/article_2262_08a7b25354cc83d658ef63fcb4c51c48.pdf
Procambarus clarkii
burrows
Fatmia Drain
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
2015-04-01
19
2
125
136
10.21608/ejabf.2015.2263
2263
Original Article
Effect of Chlorpyrifos and Neem seed extract (Azadirechtein) on hepatopancreatic cellular structures of the freshwater crayfish Procambarus clarkii
Abdel menam K.
1
Mahmoud A.
2
Zeinab K.
3
Radwa S.
4
Department of Zoology, Faculty of Science, Zagazig University, Zagazig, Egypt
Department of Zoology, Faculty of Science, Zagazig University, Zagazig, Egypt
Department of Zoology, Faculty of Science, Zagazig University, Zagazig, Egypt
Department of Zoology, Faculty of Science, Zagazig University, Zagazig, Egypt
Histological and ultrastructural studies on the normal structures of hepatopancreas of P. clarkii showed three main cell types, secretory, absorptive and fibrillar cells. The ultrastructural alterations in the hepatopancreas of the red swampcrayfish P. clarkii exposed to sublethal concentrations of Chlorprifos and neem seed extract (Azadirechtein) pesticides were studied. LC 25 of Chlorpyrifos (0.0075 ppm) produced deformation of the apical surface of absorptive cell, dispersedmicrovilli, mitochondrial swelling with ballooned cristae, deformed cisternae of RER, lytic and vacuolated cytoplasm and pyknosis of nuclei. On the other hand, LC 25 of Azadirechtein (4.99 ppm) caused deformation of mitochondria with the sparce of their cisternae, fragmentation of microvilli, ruptured RER beside the presence ofautophagic vacuole containing dark granules and finally bizzar nuclei having segregated nucleoli and irregular clumps of their chromatin. Chlorpyrifos was found to be more toxic than Azadirechtein on P. clarkii.
https://ejabf.journals.ekb.eg/article_2263_04c833de449643e0a9a4cda0ee949f37.pdf
Procambarus clarkii
chlorpyrifos
Azadirechtein
hepatopancreas
Ultrastructure
eng
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
2015-04-01
19
2
137
148
10.21608/ejabf.2015.2264
2264
Original Article
An overview on the fisheries population of Arabian scad, Trachurus indicus Nekrasov, 1966 (F: Carangidae) caught by two different fishing methods from the Gulf of Suez, Red Sea, Egypt.
Manal Sabrah
1
National Institute of Oceanography and Fisheries, NIOF, Egypt
Trachurus indicus is a semi pelagic species caught by the bottom trawl and purse seine gears adopted in the Gulf of Suez, Red Sea. The objective of this study was to demonstrate and compare the fish size, length frequency, ages and length-atage of T. indicus in the two fishing gears. The average T. indicus catch percentage constituted about 20% of the total trawl catch during the period from Sep. 2010 to Nov. 2011, while it formed about 50% of the total purse seine catch. The lengths and age compositions of T. indicus were varied between sexes in the two gears. Length ranged from 10.0±0.85cm to 26.5±1.82cm in the trawl fishery; however it ranged from 6.5±0.66 to 22.0±1.45 cm in the purse seine fishery. The maximum life span of T. indicus was estimated at 5 and 7 years in purse seine and trawl respectively. Thegrowth parameters were evaluated as K= 0.37/year, L∞ 23.9 cm and K= 0.39/year and L∞ = 22.6 cm for males and females respectively in purse seine gear. While, in the trawl gear K= 0.42/year, L∞ 24.6 cm and K=0.34/year, L∞= 27.9 cm for males and females respectively. Also, the instantaneous total, natural and fishing mortality rateswere investigated in the two gears. Results indicated that, T. indicus is exactly different in length composition, age composition and mortality rates in the two fishing gears under study. As T. indicus is the most abundant commercial species in the Gulf, its production was exploited mainly by the two gears and the exploitation rates wereapproximately the same over 0.7.
https://ejabf.journals.ekb.eg/article_2264_05ba3b07737023bb4d16e78222a1e56e.pdf
Trachurus indicus
Gulf of Suez
Red Sea
trawl and purse seine
fishery characteristics
exploitation rate