@article { author = {H, El Sagheer and M., Labib}, title = {Effect of a rotifer and artemia on survival and growth performance of gilthead seabream Sparus aurata larvae.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {1-8}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2138}, abstract = {An experiment was carried out in order to study the effect of a rotifer Brachionus plicatilis and encapsulated Artemia nauplii as a live food on survival rate and growth performance for gilthead sea bream Sparus aurata larvae. Gilthead seabream larvae (20 days old) with body length and weight of (7.3 + 0.20 mm) (5.4 + 0.10 mg) respectively, were stocked in eight white fiberglass tanks (each of 1 m3 volume) at a density of 1,200-larvae/ tank. Four treatments were tested as follows, 1) low rotifers and low artemia (LRLA); 2) high rotifers and low artemia (HRLA); 3)low rotifers and high artemia (LRHA); and 4) high rotifers and high artemia (HRHA) for 24 days (5, 25 rotifers and 50, 250 artemia /ml, during the periods 1st, 8th, 9th, 16th, 17th and 24th days of the feeding experiment).The results showed that the survival rate of S.aurata larvae significantly (P< 0.05) improved with the application of the experimental program by feeding a high mixture of rotifers and artemia. Feeding of higher levels of rotifers and artemia increased the survival rate of S. aurata to 48.96%, however, the lower levels of both resulted in only 12.17 % survival rate. Other intermediate treatments of HRLA or LRHA resulted in better improvements in the survival rates (19.08 and 32.21% respectively) of S. aurata larvae. The results clearly showed the significant role of higher levels of encapsulated A. nauplii as a live food for saving the life of S. aurata larvae as compared with rotifers.Values of growth performance of S. aurata larvae (gain in length and weight; average daily gain in length and weight; and specific growth rate, (SGR %) significantly (P < 0.05) increased with increasing the levels of live food from both rotifers and artemia. The results clearly showed the superiority of the higher levels of live artemia in enhancing growth performance of S. aurata larvae than rotifers. Finally, a suitable live food program to improve the survival rates of S. aurata larvae by feeding high levels of rotifers and artemia could be recommended.}, keywords = {Rotifers,artemia,sea bream,Survival,Growth performance}, url = {https://ejabf.journals.ekb.eg/article_2138.html}, eprint = {https://ejabf.journals.ekb.eg/article_2138_04632cee0d331fee1d9b4a057ac32e4c.pdf} } @article { author = {Al-Sayes, Abdou and El-Bokhty, El-Azab and El- Bittar, Tamer and Ibrahim, Affiffi}, title = {Assessment of Oreochromis aureus caught by different fishing techniques at Lake Borollus, Egypt.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {9-16}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2139}, abstract = {Evaluation of Oreochromis aureus caught from Lake Borollus was studied based on the length-frequency of samples collected by different fishing gears. Analysis of the data using (FiSAT) computer program returned the estimate of the von Bertalanffy's growth curve parameters as: L∞ = 18.28 cm (total length); k = 0.87 year-1 (for Lokaffa), L∞ = 19.32 cm; k = 0.41 year-1 (for Trammel), L∞ = 17.19 cm; k = 0.42 year-1 (for Basket traps) and L∞ = 14.55 cm, K=0.39 year-1 (for Al-qerba). Very narrow selection range was observed and its upper limit didn't exceed 11.53 cm in most of the investigated fishing gears except that of trammels which reached 12.11 cm. The total mortality coefficient "Z" was found to be 3.05, 1.83, 1.46, and 1.58 year-1 corresponding the fore-mentioned fishing methods respectively. Also, their respective natural mortality coefficient "M" was 1.67, 1.01, 1.06, and 1.06 year-1. The estimated exploitation rate "E" was 0.45, 0.45, 0.28 and 0.33 respectively. Their relative yield and relative biomass per recruit analysis showed that the stock of O. aureus is moderately exploited and more effort could be added to reach the maximum sustainable yield and at the same time larger mesh sizes of fishing nets should be used to increase the mean lengths at first capture and also to conserve the reproducible part of O. aureus population.}, keywords = {missed}, url = {https://ejabf.journals.ekb.eg/article_2139.html}, eprint = {https://ejabf.journals.ekb.eg/article_2139_81b1bb6faa1027e33817427333cb691e.pdf} } @article { author = {Rizkalla, Esam and Haleem, Hany and Yassa, Venees}, title = {Variability of Heavy Metals in Wild Catfish Clarias gariepinus Collected South and North Cairo Area. II. Essential Heavy Metals.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {17-42}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2140}, abstract = {Four surveys were undertaken to investigate the bioaccumulation of Fe, Cu, Zn and Mn in the liver, kidney, gills, skin and muscles of Clarias gariepinus from the River Nile south (Al-Aiat) and north (Barrage) areas of Cairo. Metals bioaccumulation were analyzed then applied to differentiate between the concentrations found at the two locations, between all of the surveys, and the two sexes.No significant seasonal variations detected in the water metals. Fe and Cu are the highest elements and Mn is the least element. Cu is the more element affected by the locality with higher concentrations in Al-Aiat than Barrage. No hazardous effect on the environmental ecosystem observed.Higher concentrations of metals were observed in the tissues of C. gariepinus than the water in which they live. All heavy metals in all organs are present in measurable quantities and still within the safe limits for consumption.Concentrations of the analyzed metals revealed large numbers of significant values concerning location, sex and season differences. Discussion is focused on the significant results.}, keywords = {Clarias gariepinus,iron,copper,zinc,Manganese,season,Location,sex}, url = {https://ejabf.journals.ekb.eg/article_2140.html}, eprint = {https://ejabf.journals.ekb.eg/article_2140_bf1fef86e06b0d784b4ccb9c9f082e9e.pdf} } @article { author = {Hanafy, Mahmoud}, title = {Effects of recreational scuba diving and snorkeling on coral reefs of the sheltered bays of the Red Sea, Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {43-56}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2141}, abstract = {Due to the scarcity of the proper access point to the deep waters by divers and snorkelers, bays and lagoons are used as sheltered marine areas in the southern Egyptian Red Sea and are represented very valuable recreational areas. With the recent booming in tourism along the Egyptian coast of the Red Sea, the sheltered bays and lagoon reefs are tremendously impacted by recreational SCUBA diving activities. Three bays with similar environmental and topographic characteristics, but with different levels of diving and snorkeling activities were selected to study the impacts of recreational SCUBA diving on sedimentation rate, substrate analysis, coral cover, diversity, coral recruitment and coral reef fish assemblages. In addition to the expected physical damage causes by incidental contacts to corals by divers, the results showed that increasing sedimentation rate as a result of intensive SCUBA diving also caused a serious impact on coral reef communities of the surveyed bays. Highest sedimentation rate was estimated at the over-dived site of the Marsa Um El-Gurifat (approximately 51,000 divers per year). Walking and standing of divers on the sea floor was disturbing the fine sediments of the bay floor, increasing turbidity and sedimentation rate on the nearby coral reefs of the bay. High sedimentation rate on the reefs of Marsa Um El-Gurifat caused the following: reduced the coral cover; overgrown soft coral that dominated coral cover, reduced the recruitment of new coral colonies, increased dead coral cover, increased the macroalgal cover especially on the reef flat areas, decreased the diversity of hard coral and coral reef fishes, shifted the fish assemblage toward higher occurrence of herbivore fishes comparing with corallivore and carnivore ones.}, keywords = {Red Sea,recreational diving,Sedimentation,coral health,regulated diving,Egypt}, url = {https://ejabf.journals.ekb.eg/article_2141.html}, eprint = {https://ejabf.journals.ekb.eg/article_2141_860342aab890acac456bab304407ae8c.pdf} } @article { author = {Abdel Mola, Hesham and Abd El-Rashid, Mohamed}, title = {Effect of drains on the distribution of zooplankton at the southeastern part of Lake Manzala, Egypt.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {57-68}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2142}, abstract = {The drains of Lake Manzala play important role in the distribution of zooplankton, especially at the southeastern part of the lake. Samples were collected from six stations at southeastern sector of the lake from August, 2009 to May, 2010. Physico-chemical parameters and zooplankton were analyzed following APHA (1992). Six groups of zooplankton were recorded; Rotifera constituted the main dominant group in the lake contributing 80.04 % of the total zooplankton population followed by Copepoda (17.29 %), Protozoa (1.35%) and Cladocera (1 %). Ostracoda and Nematoda were the less dominant groups forming 0.20 and 0.12% respectively. The Highest density of zooplankton was recorded at Ibn Salam Station (4519665 Org./m3) during spring due to the effect of wastewater discharge, rich in nutrients, through 3 main drains at this area, while the lowest abundance was recorded at El-Qaboti Station (17666 Org./m3) during winter. The lowest average numbers of total zooplankton was recorded at Bahr El-Bakar Station (160840 Org./m3). This due is to discharging sewage from Bahr El-Bakar drain which considered the main source of pollution in the lake.}, keywords = {water quality,Zooplankton,Lake Manzala}, url = {https://ejabf.journals.ekb.eg/article_2142.html}, eprint = {https://ejabf.journals.ekb.eg/article_2142_873ac5a17e791f21e134b05096c020b5.pdf} } @article { author = {Khalil, Magdy and Sayed, Montaser and Amer, Amany and Nassif, Marian}, title = {Impact of pollution on macroinvertebrates biodiversity in Ismailia Canal, Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {69-89}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2143}, abstract = {This study was conducted to monitor the adverse effect of the drainage wastewater of three main factories on the macroinvertebrates biodiversity of Ismailia Canal. Water and benthos samples were collected seasonally during 2010 from 10 stations along Ismailia Canal from El-Mezalat to Abu Zaabal city.The results revealed that most of the physico-chemical parameters were within the permissible limits, although, Cairo Power station and Abu Zaabal factory are causing partial pollution. The community of macrobenthic invertebrates was represented by Mollusca (35.20 %), Annelida (33.62 %) and Arthropoda (31.18 %). Limnodrilus hoffmeisteri and Chironomus larvae were dominating the whole studied area (32% and 28.51% of total macrobenthos, respectively) and they are considered to be potential bioindicators for polluted ecosystem. Low species diversity and occurrence of pollution-tolerant species (e.g. Limnodrilus hoffmeisteri and Chironomus larvae) indicate that the water quality of the canal is deteriorated. A regular program for biomonitoring is recommended which will allow future changes and enhancing in this important ecosystem.}, keywords = {Ismailia Canal,Macroinvertebrates,biodiversity,pollution}, url = {https://ejabf.journals.ekb.eg/article_2143.html}, eprint = {https://ejabf.journals.ekb.eg/article_2143_d984622b90e1c8bc8e78fc5ad60c91c4.pdf} } @article { author = {Abdel Gawad, S. and Abdelhamid, A. and Mabrouk, A. and El-Barbary, M.}, title = {Benthic invertebrate fauna in Ashtoum El Gamil protected area (Lake Manzalah), Egypt.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {91-101}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2145}, abstract = {Macrobenthic and meiobenthic invertebrates' samples were collected seasonally during 2010 from five stations in Ashtoum El Gamil protected area which located in the north western part of Lake Manzalah. Macrobenthic community was found including fifteen species belonging to three groups. Of these, 11 Mollusca, 2 Arthropoda and 2 Annelida. Some of them have a freshwater origin and others have marine origin. Mollusca has been ranked the first position, constituting about 68.5 % of the total population density (P. D.) of macrobenthic invertebrates, followed by Arthropoda and Annelida, constituting 28.7 % and 2.8 % respectively. The highest average standing crop was recorded in station 3. Macrobenthic fauna average value reached its maximum in winter in the whole area, while summer was the least productive season. Meiofauna community consisted of 3 main groups. Ostracoda was the first one, constituting 70.71 % of the total population of meiofauna followed by Foraminifera (27 %) and Nematoda (1.5 %). Meiofauna flourished during summer and spring in the area, while it reached its minimum levels during autumn and winter. Salinity and nature of the sediment were important factors affecting distribution and abundance of benthic invertebrates.}, keywords = {Macrobenthic invertebrates,meiobenthic invertebrates,Fauna,population density}, url = {https://ejabf.journals.ekb.eg/article_2145.html}, eprint = {https://ejabf.journals.ekb.eg/article_2145_34e043bae2b5287480b19b3772c075d8.pdf} } @article { author = {Riad, Rafik and Kilada, Raouf}, title = {Reproductive biology of the musky octopus Eledone moschata (Cephalopoda: Octopodidae) in the eastern Mediterranean, Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {103-113}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2146}, abstract = {The current study was designed to address the lack of information regarding the reproduction biology of the musky octopus, Eledone moschata, in the Mediterranean Sea. The work presents the first detailed study of seasonal variation in sexual maturity and age determination using length-frequency analysis. The length-frequency analysis in both male and female samples revealed 2 modes that are assumed to be 2 years classes. Eggs number per ovary weight (g) showed a significant differences among seasons (P = 0.001), with peak fecundity occurring during the winter followed by a progressive decline in spring through fall. The GSI values also showed similar results where the index value was higher in winter and then declined in the following seasons. This indicates that the spawning season of the musky octopus may occur in the summer and may extend to the fall of the same year. The musky octopus is dioecious. The male were found to reach sexual maturity earlier than the female tissues. The 50% sexual maturity level was reached at 7.2 cm CL for males and 7.4 cm CL mm for females.}, keywords = {Musky octopus,Eledone moschata,reproduction biology,sexual maturity,length frequency}, url = {https://ejabf.journals.ekb.eg/article_2146.html}, eprint = {https://ejabf.journals.ekb.eg/article_2146_9f4eeaa90d001b750c27f89fc21e5bbb.pdf} } @article { author = {Hellal, Ahemd and Gab-Alla, Ali and Morsy, Nesreen and Mohamed, Saad}, title = {Reproductive strategy of the common star fish, Astropecten polyacanthus (Echinodermata: Asteroidea) from Suez Canal Lakes, Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {113-128}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2147}, abstract = {Specimens of the star fish, Astropecten polyacanthus were collected monthly from the Great Bitter lakes and Lake Timsah during the period from1999 to 2001. Individuals of A. polyacanthus showed a sex ratio (males to females) of 1:1.34 and 1:0.97 in Great Bitter lakes and Lake Timsah respectively. The examination of reproductive data showed that individuals of A. polyacanthus spawned all the year around with peaks during spring and autumn. Oocyte size frequency distribution was similar in both lakes and the egg size ranged from 8 μ to 90 μ. All different sizes of oocytes were found all the year around with different proportions. Maximum fecundity (oocytes / female) reached 4800000 at Great Bitter Lakes and 7465860 at Lake Timsah. Fecundity showed exponential increases with the increase in body size, body weight and gonad weight.}, keywords = {Astropecten polyacanthus,Gonad index,sex ratio,fecundity}, url = {https://ejabf.journals.ekb.eg/article_2147.html}, eprint = {https://ejabf.journals.ekb.eg/article_2147_3df97397df7931e62f50d4f12f5fa429.pdf} } @article { author = {Azab, Ahmad}, title = {Histological Studies on the Liver of Some Plectognthid Fishes (Order: Tetraodontiformes), Red Sea, Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {129-137}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2148}, abstract = {This work was carried out on some plectognathid fishes to study the normal histological structure of the liver. They contained puffer fishes, Arothron hispidus and A. stellatus; porcupine fish, Diodon hystrix; and blue trigger fish, Pseudobalistes fuscus. Specimens of these fish species were collected from the Red Sea.Histological results showed that the liver was composed of hepatic parenchyma which externally covered by a loose connective tissue and a layer of squamous epithelium. Hepatocytes are radially arranged around a central vein in interconnecting laminae of two cells thickness, separated by blood sinusoids. They are big and rounded or oval in shape with transparent cytoplasm, because of the presence of a large quantity of lipids. It contained a large, rounded, and peripherally nucleus with a prominent dark nucleolus.The pancreatic tissue is distributed in the liver as hepatopancreas. Thin septa of connective tissue separated pancreatic cells from hepatocytes. The pancreatic cells are tall and columnar, with spherical and basal nuclei, having prominent dark nucleoli. Zymogen granules are located in the apical ends of these cells. The results showed the presence of melano-macrophage aggregations in hepatic parenchyma of all studied fish species of tetraodontiformes.}, keywords = {Fishes,Plectognathids,Tetraodontiformes,histology,Liver}, url = {https://ejabf.journals.ekb.eg/article_2148.html}, eprint = {https://ejabf.journals.ekb.eg/article_2148_a0cd75399a34d042cee8520e45560628.pdf} } @article { author = {Saad, Abd El-Halim and Khalil, Magdy and Fishar, Mohamed and Bedir, Tadros}, title = {Biodiversity of meiobenthic invertebrates in Lake Bardawil, Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {139-149}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2149}, abstract = {Species composition, distribution of meiobenthic invertebrates in Baradwil Wetland were studied during 2006-2007. Seasonal samples were collected from 12 stations representing different habitats of the wetland. The results revealed that Thirteen species and 2 types of larval stages were identified in the lake (4 Foraminifera, 3 Copepoda, 2 Ostracoda, 2 Nematoda, one Tardigrada and one Mollusca). Ostracoda dominated the other groups forming 42.8 % of total meiobenthos.The population density of meiobenthos was obviously higher in eastern part of the lake, with a major peak of about 3780 Org/10 cm2 at station I, while the lowest crop of an average 942 Org/10cm2 was found at station II. Regarding seasonal variation, there was a gradual increase in meiobenthos standing crop from minimum of 1103 Org/10cm2 in summer until reaching a maximum of an average 3048 Org/10cm2 in winter with an overall average of 1820 Org/10cm2.Fish community changes during the last two decades, which consequently changed the whole ecosystem of the lake, encourages us to recommend establishing a monitoring program to follow up changes in the lake ecosystem, especially the benthic fauna that will be of great help in the management of such important water body}, keywords = {Bardawil Lake,Meiobenthos,Invertebrates,biodiversity,Ecology,Egypt}, url = {https://ejabf.journals.ekb.eg/article_2149.html}, eprint = {https://ejabf.journals.ekb.eg/article_2149_18a62786b13e3d69f7b8e984797313fe.pdf} } @article { author = {Nasser, El-Hag and Hammod, El-Sagheer}, title = {An economic study of the production and consumption of fish in Yemen during the period (1996 -2010)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {16}, number = {4}, pages = {1-7}, year = {2012}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2012.2150}, abstract = {Fish is one of the main commodities consisting of style food in coastal areas of Yemen, but it is one of goods which play an important role in the food security of the population in Yemen. With increasing awareness of fish, became favorite in many provinces mountainous interior offshore Yemen, which led to an increase in demand for fish during the period of study and although there is self-sufficiency of the fish, that the average per capita consumption is 6.5 kg only, as the fish is the most important export commodities in Yemen, as the study showed that the annual rate of exports amounted to about 34 thousand tons with a total value of 10 million Ryals annually.}, keywords = {fish,production,Consumption,Exports,Yemen}, url = {https://ejabf.journals.ekb.eg/article_2150.html}, eprint = {https://ejabf.journals.ekb.eg/article_2150_55d1588a68190ed2c5296ccbc04a5972.pdf} }