The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601EFFECT OF DIET COMPOSITION AND PROTEIN LEVEL ON GROWTH, BODY COMPOSITION AND COST OF PRODUCTION OF GILTHEAD SEA BREAM (SPARUS AURATA)118337210.21608/ejabf.1997.3372ENGaber HassanenDepartment of Fisheries Resources and Aquaculture, Faculty of Environmental Agricultural Sciences, Suez Canal University,
El- Arish, North Sinai, Egypt.Journal Article20170615sixteen week feeding trial was carried out with young gilthead sea bream with a mean weight of 3.2 g .The effects of diet<br />composition and varying dietary protein level on several nutritional parameters of S. aurata were studied. Three different combinations (A, B and C) were used as the main ingredient in formulating three pairs of diets differing in their protein content (38 or 46 % ). The growth of the fish was negatively correlated with the soybean meal content of the diet . The best growth was obtained with diet of 38% protein, containing the protein mixture (B). It is produced<br />significantly (p≤0.05) greater weight gain, feed conversion ,protein efficiency ratio value and protein retained than all other diets . Intermediate responses were observed for fish fed diet containing protein from mixture (A) with 46% protein. While diets containing mixture (C), for both two levels of protein yielded the lowest values . The protein content of the whole fish carcases was negatively correlated with the fish weight and positively with the soybean meal content of the diet. The body lipid content had an inverse relationship. Feed cost per kg weight gain with a diet containing 38 % protein formulated from mixture (B) proved to be the most economical diet. This diet appears to provide a practical<br />diet for Sparus aurata fingerlings . The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601UTILIZATION OF SOME AQUATIC PLANTS IN DIET OF NILE TILAPIA, OREOCHROMIS NLOTICUS, FINGERLINGS1934337310.21608/ejabf.1997.3373ENMohamed EssaNational Institute of Oceanography and Fisheries, Kayet Bay, Alexandria, EgyptJournal Article20170615The present study was undertaken to evaluate the value and inclusion of some available aquatic plants in the diet of Nile<br />tilapia, Oreochromis niloticus, fingerlings held in net-enclosures in frtilized earthen pond at El-Mex Research Station, National Institute of Oceanography and Fisheries, Alexandria. The plants chosen were pondweed (Potamogeton pectinatus); coontail (Ceratophylim demersum) and duckweed (Lemna lemna). Comparing the results revealed that: 1) no significant difference were found in percentage dry matter, crude protein and ether extract of fish carcass composition, fed different levels of aquatic plants (25% and 50%) in the diet, but ash percent was significantly increased as<br />the proportion of aquatic plants increased in the diet; 2) the fish tend to have more protein and less ash when fed diet containing 25% and 50% duckweed or 25% pondweed; and 3) tilapia used feed very efficiently at a level of 50% of the standard diet by duckweed and 25% by coontail or pondweed without any significantly adverse effects on appetite, feed utilization and growth performance.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601EFFECT OF COLD AND HOT SMOKING ON PHYSIOCHEMICAL PROPERTIES OF COMMON CARP (CYPRINUS CARPIO) DURING COLD STORAGE3552337410.21608/ejabf.1997.3374ENBassiouny S.Food Science Department, Faculty of Agriculture, Zagazig UniversityAbou-El-Maati M.Central Laboratory for Aquaculture Research, Abbassa, Agriculture
Research Center.Zakar A.Central Laboratory for Aquaculture Research, Abbassa, Agriculture
Research Center.Fatma AfezFood Science Institute, Agriculture Research CenterAbbas A.Food Science Institute, Agriculture Research CenterJournal Article20170615Due to the steady increase of carp fish product ion from new fish cultures in Egypt, and the poor quality of such fish which is not tasted for most Egyptian consumers, while the advantage of this fish is a rapid growth. This study was carried out in Central Laboratory for Aquaculture Research, Abbassa, Agriculture Research Center. The samples were selected for smoke process and washed with tap water. The samples were randomly assigned to 4 groups (fish fillets without skin, butter fly shape with skin, headed and gutted fish sample and skinless headed and gutted fish sample).<br />This work was carried out to study preservability of common carp fish by salting (dry and wet) and smoking process (cold and hot smoked) . Besides, raw and smoked f ish samples were evaluated chemical ly, microbiological ly, organolept ical ly immediately after processing and during cold storage(4±l°C). Results showed that fish butter fly shape with skin in coldsmoked process, vacuum packaged in polyethylene bags and stored at (4±1°C) for 75 days were the best conditions as compared with hot-smoking process during cold storage. The results showed that the smoking process of raw fish led to reduce moisture, protein, fat, TSN, SNPN and pH value, while ash, salt, TVN TBA and plasticity were increased. The overall acceptability scores of all stored smoked samples tended to be significantly decreased with<br />the increasing storage period. The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601CHEMICAL AND BACTERIOLOGICAL CHANGES OCCURRING DURING THE PROCESSING OF EGYPTIAN SILVER CARP FISH5370337610.21608/ejabf.1997.3376ENKhallaf F.Ain shams University, Faculty of Agriculture, Food Science DepartmentEl-samkary A.Ain shams University, Faculty of Agriculture, Food Science DepartmentAhmad A.National Institute of Oceanography and FisheriesAbo-Taleb M.National Institute of Oceanography and FisheriesJournal Article20170615This work was designed in an attempt to increase the acceptability and utilization of silver carp fish (SCF). Various<br />treatments were subjected to chemical, bacteriological as well as organoleptic determinations to evaluate the changes caused by freezing or canning processes of SCF. The obtained results indicated that SCF contained 82.94% protein on dry weight basis. Amino acid analysis showed l6 different amino acids included nine essential amino acids. Total<br />essential, total basic and total acidic amino acids were fluctuated during frozen storage, while sulfur containing amino acids were decreased. Bacterial counts of fresh fish was 296 c.f/g reached to 398 c.f/g at the end of frozen storage. Counts minimized after canning, the highest count showed in canned minced SCF, whereas the lowest was in<br />canned smoked SCF. The TVB-N content of canned SCF in the five groups of investigation (oil, vinegar and spices, sauce, smoked and minced) was gradually increased as the storage period increased. Canned SCF processed from frozen pre-stored fish was found to contain higher TVBN than canned SCF prepared from fresh fish. The lower increasing<br />rate of TMA-N content was recorded in canned fish prepared using fresh SCF. Canning process improved the organoleptic characteristics of SCF. Both canned smoked and canned minced fish showed noticeable increase in acceptance of flavor and color. Overall acceptability scores were decreased progressively in all canned fish groups during storage.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601STUDIES ON THE UTILIZATION OF EGYPTIAN SILVER CARP FISH7192337710.21608/ejabf.1997.3377ENEl-Samkary A.Ain Shams University, Faculty of Agriculture, Food Science DepartmentKhallaf R.Ain Shams University, Faculty of Agriculture, Food Science DepartmentAhmed A.National Institute of Oceanography and FisheriesAbo-Taleb M.National Institute of Oceanography and FisheriesJournal Article20170615This investigation was carried out to study the utilization of silver carp fish. Different canned silver carp fish forms were<br />manufactured. All samples were subjected to chemical analysis as well as organoleptic evaluation. The obtained results<br />revealed that fresh SC fish consists of 77.9% moisture, 82.9% protein, 11.8% fat and 5.3% ash. Calorific value was 437.7 Kcal / 100 g increased to 451.7 Kcl/100 g in samples of SC canned in oil. During frozen storage, protein, fat, ash and moisture decreased as the time of storage increased. Canned silver carp processed from frozen pre- stored fish showed lower protein and moisture contents. Canning caused increase in fat and ash. During frozen storage, TVB-N, TMA-N, NH3-N, FAN, VRS, tyrosine and TBA showed a significant increase with the prolongation of storage at -18°C. Values of TVB-N, NH3, tyrosine and TBA increased after canning. The rate of increasing of TVB-N, NH3-N and TBA values in canned fish were increased with the prolongation of frozen storage periods. The higher rate of increasing in tyrosine values found in canned SC fish produced from fresh fish. Significant decrease was found in TMA, FAN and VRS contents of SCF after canning. The highest rate of decrease in FAN and VRS was found in canned SC fish samples prepared from fish stored for 120 days at -18°C before canning. Reading of fresh silver carp fish electrophoretic diagrams revealed that six bands were separated. The number of bands of canned fresh fish are not changed but varied in their area percentages with noticeable decrease in soluble proteins. The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601EFFECT OF DIFFERENT DIETARY CRUDE PROTEIN LEVELS SUPPLEMENTED WITH GRADED LEVELS OF FLAVOMYCIN ON GROWTH PERFORMANCE OF NILE TILAPIA FRY AND THEIR UTILIZATION OF DIFFERENT NUTRIENTS93108337810.21608/ejabf.1997.3378ENAbdelhamid M.Animal production Dept., Faculty of Agriculture, Mansoura UnivF. KhalilAnimal production Dept., Faculty of Agriculture, Mansoura UnivM. ElbarbaryAnimal production Dept., Faculty of Agriculture, Mansoura Univ.Journal Article20170615This study was carried out on Nile tilapia fry, which were fed for 8 weeks on 25 or 30% dietary crude protein (CP) and 0,1,5 or 10 g flavomycin (FM)/kg diet. The following results were obtained: 1. dietary FM inclusion improved daily gain of fish body weight, relative growth rate (RGR), specific growth rate (SGR), feed intake (FI), and feed conversion ratio (FCR), particularly at the digest rate (10 g/kg). It reduced mortality rate of the fish and improved also protein productive value, protein efficiency ratio, and energy utilization. 2. increasing dietary CP led to increased body weight of the<br />fish as well as body gain (as length and weight), RGR, SGR, FI, and FCR and reduced fat content of fish body.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601EFFECT OF DIETARY COMPOSITION ON SOME PERFORMANCE AND HEMATOLOGICAL ASPECTS OF SEA BASS (DICENTRARCHUS LABRAX).109130337910.21608/ejabf.1997.3379ENGaber HassanenFaculty of Environmental Agricultural Sciences, Suez Canal University,
El-Arish, EgyptAtef Abou-AshourFaculty of Agriculture, University of Monoufia, Shebin El Kom, EgyptHelmy Abd El- RahmanFaculty of Agriculture, University of Monoufia, Shebin El Kom, EgyptSoliman Abd El-RahmanNational Institute of Oceanography and Fisheries, EgyptAhmed El- HammadyNational Institute of Oceanography and Fisheries, EgyptJournal Article20170615The present study was carried out to gain addi t ional informat ion on rearing, feed and feeding as well as hematological aspects of sea bass (Dicentrarchus labrax) fingerl ings reared in pen enclosures. This study lasted for 224<br />days in Manzala lake (Port Said Governorate). The experimental fishes were subjected to five various feeding systems as follows:(1) 100% trash fish, (2) 75% trash fish plus 25% dry pelleted feed, (3) 50% trash fish plus 50% dry pelleted feed, (4) 25% trash fish plus 75% dry pelleted feed, and (5) 100% dry pelleted feed. Experimental periods were divided into two intervals 1-112 and 112-224 days. The results obtained could be summarized as follows: 1-The highest body weight gain after 1-112 days or 112-224 days and 1- 224 days was obtained by group fed 25% trash fish plus 75% dry pelleted feed. 2-The relative feed intake was increased in the first period and decreased in the second period as the water temperature decreased. 3-The best feed conversion ratio (1.18), feed conversion efficiency (84%) and the highest value of protein efficiency ratio (1.8) during the first rearing period were obtained where fish received 100% trash fish as compared to other experimental groups of fishes. 4- Neither trash fish nor dry pelleted feed had a significant effect on<br />chemical body composition. 5- Neither trash fish nor pelleted feed had significant effect on hematocrit<br />value, hemoglobin concentration, and mean corpuscular hemoglobin. 6- Total serum protein contents decreased significantly (P<0.05) as the percentage pelleted feed increased.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601COMPARISON OF IMPOSEX INDUCTION IN THE GASTROPODS MUREX TRIBULUS AND THAIS CARNIFERA FROM THE SUEZ CANAL AND THE MEDITERRANEAN SEA131143338010.21608/ejabf.1997.3380ENMahmoud H. Hanafy HanafyMarine Science Dept. Faculty of Science, Suez Canal University, Ismailia, Egypt.Andrew BrandPort Erin Marine Lab., Liverpool University, Isle of Man, UKJournal Article20170615The prosobranch gastropods Murex tribulus and Thais carnifera were found to exhibit imposex (growth of male parts in connection with female genital organs) in response to tributyltin (TBT) pollution. Six stages of imposex induction in T. carnifera (1-6) were distinguished and documented with SEM photographs for the first time; and compared with the<br />mode of imposex in M. tribulus which has only 4 stages. Sterilization in females of both species due to<br />imposex induction was recorded. Anatomical and histological details are given here. In late stages of imposex (i.e. 5 and 6) the genital pore of female T. carnifera is occluded by overgrowth of vas deferens tissue. This blockage of the pallial oviduct prevents the release of egg capsules and renders the female sterile. Hence, the aborted egg capsules are accumulated in the oviduct causing reproductive failure. In contrast, female M. tribulus did not show any potential for blockage of the genital pore. Histological investigation indicated that sterility in female M. tribulus is likely to be related to the failure of oogenesis where it was suppressed and supplanted by spermatogenesis. In contrast, oogenesis proceeded normally in T. carnifera even in late stages of imposex. It is concluded that imposex induction can virtually, if<br />not totally, eliminate all breeding activities in M. tribulus due to oogenesis depression, and in T. carnifera as a result of genital pore blockage.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601EFFECT OF SOME ECOLOGICAL FACTORS ON THE PARASITIC FAUNA OF SOME FRESHWATER FISHES IN GHARBIA GOVERNORATE, EGYPT145158338110.21608/ejabf.1997.3381ENSaied Noor El – DinDepartment of Zoology, Faculty of Science, Tanta University, EgyptBadawy BadawyDepartment of Zoology, Faculty of Science, Tanta University, EgyptNahla OmranDepartment of Zoology, Faculty of Science, Tanta University, EgyptMohamed MonaDepartment of Zoology, Faculty of Science, Tanta University, EgyptJournal Article20170615It was found that the increase of the length of the host body results in an increase in the prevalence of infection.The<br />prevalence of infection in females approximatly equals that in males.The prevalence of infection reaches its peak in the spring and summer while in winter it decreased sharply.The study of the effect of 10 mg/1 copper sulphate was lethal to ectoparasitic Monogenea after five hours. This study was confirmed by using scanning electron microsocpe on the treated monogenean parasites.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601IMPACT OF DIFFERENT FOOD ITEMS AND STARVATION ON THE BIOLOGY AND LABORATORY MAINTENANCE OF BIOMPHALARLA ALEXANDRINA, THE INTERMEDIATE HOST SNAIL OF SCHISTOSOMA MANSONI IN EGYPT159185338210.21608/ejabf.1997.3382ENEl-Sayed RizkZoology Department, Faculty of Science, Tanta University Tata,Egypt.Nagla Abu- NaserZoology Department, Faculty of Science, Tanta University Tata,EgyptMohamed MonaZoology Department, Faculty of Science, Tanta University Tata,Egypt.Journal Article20170615The present investigation has been performed to study the effect of different food items and starvation on some biological<br />parameters and laboratory maintenance of B. alexandrina snail, the intermediate host of S. mansoni in Egypt. The growth rate, egg laying capacity, hatchability of deposited eggs, development of the newly hatched snails and the mortality rate of the experimental snails were quantitatively determined and compared with the control ones fed on dried lettuce. The tested experimental food items are, a market prepared food (the rabbit food pellets); a natural food source from the<br />common aquatic plants (Eichhornia carassipes, Lemna gibba and Ceratophyllum demersttm) and a mixed food (dry lettuce supplemented with milk powder). The biochemical composition of the three food items and control food were analyzed. The results showed that snails fed on market food for a period of six weeks showed a significant increase in<br />the number of egg masses and eggs, the rate of the egg hatchability and in the rate of growth. Moreover, market food was found a suitable food for maintenance of newly hatched as well as adult snails as indicated by low mortality rate. The results also showed that hermaphrodite gland acini of snails fed on market food were most frequently in the final stages of oogenesis and spermatogenegsis, and their digestive gland tubules were well organized. The wet weight of<br />the digestive gland gonad complex was significantly increased than that of the control and other tested food items. In conclusion, the market food was recommended as the food for stock aquaria. The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601SCHISTOSOMIASIS CONTROL IN EGYPT: THE IMPACT OF CHLORINATED LIME AS A CERCARICIDE ON SOME NON-TARGET AQUATIC SPECIES COMMONLY DISTRIBUTED IN IRRIGATION CANALS187198338510.21608/ejabf.1997.3385ENIsmail Al-SharkawiZoology Department, Faculty of Science, University of Tanta, 31111 Tanta, Egypt.Badawy BadawyZoology Department, Faculty of Science, University of Tanta, 31111 Tanta, Egypt.Journal Article20170618Chlorinated lime is the cercaricide of choice suggested for use in the control of schistosomiasis transmission in irrigation<br />canals and ditches by what is termed the "cercaricidal pocket". The present study was, therefore, conducted to evaluate the lethality of the compound against some representative aquatic species commonly found in the irrigation streams. The species tested were the snails: Physa acuta, Planorbis planorbis, Lanistes carinatus and Bellamya unicolor; the fish: Clarias lazera,Oreochromis niloticus and Gambusia affinis; the annelid: Hirudo sp.; the crustaceans: Daphnia sp., Cyclops sp., Cypris sp. and Caridina nilotica and the aquatic insects: Belostoma nilotica,Cybister sp. and the mosquito larvae as well as the tadpole larvae.The results obtained showed first that, except for tadpole larvae, no mortalities were observed at an exposure concentration of 5 ppm of the cercaricide. The lethal concentration of the compound varied with the species. Secondly, all mortalities of the species tested took place during the first 24 hours of exposure and the animals survived the exposure behaved normally thereafter. Thirdly, the cercaricide is safe for all the aquatic species tested at the cercaricidal concentration suggested for use in the control of Schistosoma mansoni transmission.<br />The advantage of the compound and the way of its application in the control of S. mansoni transmission in Egypt was<br />discussed in view of the results obtained.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601DELETERIOUS EFFECTS OF CYANIDE COMPOUNDS USED BY SOME FISHERMEN ON THE ECONOMIC FISHES OF BAHR SHEBEEN CANAL, EGYPTIAN DELTA199231338610.21608/ejabf.1997.3386ENAlaa Alne-na-eiDepartment of Zoology, Faculty of Science, Almenofiya University, Shebeen Alkoom,Journal Article20170618The potential impacts of different cyanide concentrations on the mortality, behavior and growth of the economic fishes: Tilapia zillii, Clarias lazera and Chrysichthys reuppelli were examined. The growth of T. zillii and C. lazera were significantly reduced at lower and higher cyanide concentrations while C. reuppelli showed insignificant growth depression at lower levels of cyanide. The application of sublethal dose 0.03 mg/L of KCN on T. zillii for 42 days resulted in: (1) Severe and diffuse multifocal lamellar aneurysms for 64 % of the fish gills. (2) Delayed or suppressed the ovarian growth (OSI) and oocyte maturation (diameter). The histological studies of the ovarian sections of cyanide-exposed T.<br />zillii revealed impaired ovarian development. The oocytes of 76 % female T. zillii failed to complete the secondary yolk deposition and the proportion of atretic oocytes per total number of oocytes was significantly higher compared to the control group. Collectively, the findings of this study suggest that the use of cyanide compounds by fishermen in Bahr Shebeen Canal as a fish poison might reduce the survival of fish by impairing growth, respiration and reproductive success. The oogenesis disorder and the decrease in number of the viable eggs can cause serious disturbance in the<br />natural reproduction and a drastic decline in fish population.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601CHEMICAL TREATMENT OF SEWAGE233246338710.21608/ejabf.1997.3387ENIbrahim RashedPhysical science Dept, Fac. of Eng., Mansoura Univ., EgyptAhmed Al-SarawyPhysical science Dept, Fac. of Eng., Mansoura Univ., EgyptMahmoud El-KomyPhysical and Math. Science Dept., Fac. of Eng. (Shoubra), Zagazig Univ., Egypt.Hodu Al-GamalPublic works Dept., Fac. of Eng., Mansoura Univ., EgyptJournal Article20170618Sewage treatment protects the receiving water from organic matter, nutrients, bacteria and viruses. The removal efficiency can be explained in terms of primary and secondary oxygen consumption. In Egypt the biological treatment process didn't prevent eutrophication in the receiving water bodies. Phosphorus is often the limiting factor for the algal growth. Today chemical precipitation is more frequently discussed as an alternative or complement to biological treatment. In many closed governorates,(Dakahlia, Damietta, El- Gharbia, El-Monofia, El-Kaliobia,... etc. ), the most crucial factor in erecting biological sewage treatment plants is the availability of land. In this paper the emphasizes will be on the demonstration of the different aspects of chemical sewage treatment as an alternative or complementary for biological sewage treatment, in addition to an experimental investigation for the use of conventional coagulants in sewage treatment through direct precipitation.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601EFFECT OF THE MOLLUSCICIDE BAYLUSCIDE ON THE TESTIS OF THE VIVIPAROUS FISH GAMBUSIA AFFINIS. AN ULTRASTRUCTURAL STUDY.247259338810.21608/ejabf.1997.3388ENSaid KamelNational Institute of Oceanography & Fisheries, Fish Research Station, Zamalik.Mohamad WalashAl-Azhar University, Faculty of Science for Girls, Zoology DepartmentHoda An ShomanAl-Azhar University, Faculty of Science for Girls, Zoology DepartmentAsmaa RadwanAl-Azhar University, Faculty of Medicine for Girls, Anatomy DepartmentJournal Article20170618exually mature specimens of the mosquitofish, Gambusia affinis (Baird and Giard) were exposed to a low concentration (0.2 mg/1) of the molluscicide Bayluscide for 15 days. The testes of these fishes, examined by the EM, have revealed severe cytological changes. The intertubular spaces were infiltrated binucleated cells,and different types of lymphocytes with degenerated mitochondria. The epithelial cells of the sperm follicles showed degenerated mitochondria and dilated endoplasmic reticulum. The round nuclei of the sertoli cells became flat and irregular in shape with less dense euchromatic material and degenerated nucleoli. The endoplasmic reticulum and the ribosomes became very few, and the<br />microfilaments became hardly defined. The sperm heads lost their normal arrangement and polarity in the sertoli cells. They became more round with irregular outlines. The acrosome and the cell membrane were degenerated. The mitochondrial sheath, in the midpiece, became separated from the axial filament and showed signs<br />of disintegration and disorganization The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601NILE FISH AS A CARRIER OF SOME FUNGI AND FOOD POISONING BACTERIA IN CONNECTION WIDTH RIVER NILE POLLUTION BY ABATTOIR SEWAGE261268338910.21608/ejabf.1997.3389ENEl-Bassiouny A.Hygiene, Preventive Medicine & Feeding Dept., and Food Hygiene & Control Dept., Fac. of Vet. med., Tanta University.Saad M.Hygiene, Preventive Medicine & Feeding Dept., and Food Hygiene & Control Dept., Fac. of Vet. med., Tanta University.Edris M.Hygiene, Preventive Medicine & Feeding Dept., and Food Hygiene & Control Dept., Fac. of Vet. med., Tanta University.Mousa M.Food Hygiene & Control Dept., Fac. of Vet. med., Alexandria UnivJournal Article20170618Atotal of 300 swabs were taken from 100 Nile fish surfaces (3 swabs from each fish), in addition to 75 sewer swabs from<br />25 slaughterhouses (3 swabs from each sewer) at Gharbia and Kalyobia Governorates. All the swabs were subjected to<br />microbiological methods for isolation of Staphylococcus aureus, Salmonella spp. and Moulds and Yeasts. Staph. aureus could be isolated from 11% of the fish samples and 88% from the sewer samples. While Salmonella organisms were present in 8% of the sewer samples; they were absent in all samples. Aspergillus, Penicillium, Mucor, Candida, Rhodot could be isolated from both the sewer and fish samples. Moreover, isolates belonging to the genera Aspergillus and Candida were further identified to the species level. Aspergillus niger, A. fumigatus , A. flavus, Candida albicans, C. tropicalis and C. parapsillosis could be differentiated. The public health importance of the most isolated pathogenic organisms was given. The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601FISHERY MANAGEMENT OF THE NILE CATFISH SCHILBE (SCHILBE) MYSTUS (LINNAEUS, 1758) FROM THE RIVER NILE, CAIRO SECTOR269289339010.21608/ejabf.1997.3390ENAdel TharwatCairo Univ., Fac. of Agriculture, Animal Production Dept, Giza,Egypt.Waheed EmamAin Shams Univ., Fac. of Science, Zool. Dept., Cairo, EgyptJournal Article20170618Samples of the catfish, Schilbe (Schilbe) mystus were monthly collected from the Cairo sector of the River Nile in the period from January 1996 to May 1997 by using two common fishing gears namely; El-Nakaria and El-Mehair. The spawning season of this catfish extends from May to August. The sex ratio for males and females was about 1 :1.4 and they reach their first sexual maturity at about 17 cm of their total length which corresponding to age of about 1.3 year. The estimated gear selectivity for El-Nakria was 15.7 cm, while that for El-Mehair was 21.9 cm. The total<br />mortality coefficients for catfishes gilled by El-Nakaria and El- Mehair nets were 1.49 and 1.36 per year, respectively, while their respective exploitation rates were 0.53 and 0.48. The yield and biomass per recruit were computed for S. mystus obtained by each type of nets and recommendation necessary for proper management of the fisheries of this species have been discussed.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601FISHERIES MANAGEMENT STUDIES ON THE BARDAWIL LAGOON, NORTHERN SINAI, EGYPT.291307339110.21608/ejabf.1997.3391ENM. BreikaaNational Institute of Oceanography and Fisheries, Suez and Aqaba Gulfs Branch, Po. Box 182 Suez.Journal Article20170618The data of the present study on fisheries of the Bardawil Lagoon cover a successive 29 years from 1968 to 1996.<br />Two main fishing techniques are used at present; Bouss and Dabba. The surplus production model of Fox (1970) was<br />appl ied for measur ing the maximum sustainable yield (MSY) and the corresponding exerted effort; fmax. The results<br />were MSY = 2251.907 tons and fmax = 653.268 Dabba units. For management according to f0.1 level; the maximum economic yield (MEY) attains 2190.122 tons and fMEY 511 Dabba units. It is clear that, at f0.1 level the MEY value realizes about 97 % of MSY value and reducing 61.687 tons or 2.74 % of yield, while the reduction of fishing effort reaches about 22 % at f0.1 level. The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601FISHERIES STATUS IN BARDAWIL LAGOON, NORTH SINAI, EGYPT.309323339210.21608/ejabf.1997.3392ENAbd El-Hakim W.Faculty of Science, Al-Azhar University, Cairo, EgyptAzab, A. M. M.Faculty of Science, Al-Azhar University, Cairo, EgyptMoustafa T.General Authority for Fish Resources Development, Nasr City, Cairo, EgyptJournal Article20170618Fisheries status in the Bardawil Lagoon, during the period from 1985 till September 1997, was greatly varied. Analysis of<br />the yearly yield composition showed that the production of sea bream gradually decreased from 69.2% of the total catch during 1985 to only 5.5% during 1997. In contrast, the crustaceans (crabs and shrimps) which didn't represent more than 1.5% of the total catch till 1991, sharply increased during 1997 to 52.6%. Ecological and biological conditions in Bardawil Lagoon and the causes which led to these variations in the yield composition were discussed.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601SOME BIOLOGICAL ASPECTS AND POPULATION DYNAMICS OF THE RIVER NILE FISH, LABEO NILOTICUS (FORSKAL,1775)325345339310.21608/ejabf.1997.3393ENAdel TharwatDepartment of Animal Production, Faculty of
Agriculture, Cairo Univ.El-Sayd Fikri El-DawiDepariment of Zoology, Faculty of Science, Ain Shams Univ.Journal Article20170618abeo niloticus, is one of many fishes that decreased or nearly disappeared in catch, from different areas of the River Nile,<br />especially in Cairo and Giza. In the present study age, growth, reproductive biology and population dynamics of this species from the River Nile at Cairo and Giza were studied. The study revealed that the total mortality rate was 81% yearly, whereas, the estimated values for natural and fishing mortality coefficients were 0.58 and 1.08, respectively. Also, the exploitation rate of the fish stock was 0.65. Moreover, the longevity of L. niloticus in the catch<br />was three years only. Average fish size (26 cm, total length and 145 g total weight) was smaller than the size and weight at the first sexual maturity (31 cm. total length and 248 g. total weight). The aforementioned results indicate that the low density in the population of Labeo niloticus is attributed to over fishing. Thus, it is recommended to prevent catching the fish size less than 31 cm T.L. or 248 g T.W. This is to give at least one time for the mature fish to spawn and to recruit the fish stock.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601REVISION OF DIPLOSTOMUM SPATHACEUM (RUDOLPHI, 1819) AND D. PSEUDOSPATHACEUM NIEWIADOMSKA, 1984 (TREMATODA: DIPLOSTOMATIDAE) FROM THE FARM FISH CARP CYPR1NUS CARPIO347357339410.21608/ejabf.1997.3394ENMostafa El-MmehlawyZoology Department, Faculty of Science, Tanta University, Tanta, EgyptJournal Article20170618Diplostomum spathaceum (Rudolphi, 1819) and D. pseudospathaceum Niewiadomska, 1984 have been known<br />for a long time under two different names. The above mentioned two species are revised in this article, on the basis of<br />plenty of collected materials from fish farms in Kafr Elsheikh, Egypt. Variations of both fixed metacercariae (heat-fixed) and live ones were critically investigated on the basis of the morphologically and specific systematic organs. The<br />monographic data and the available measurement ratio which were obtained revealed a high similarity for the fixed<br />metacercariae. However, the comparison of the variations are not enough to separate them as two distinct species.<br />Consequently, D. pseudospathaceum could be recognized as a synonym for the D. spathaceum.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601A STUDY ON SOME PROTOZOA INFESTING THE FRESHWATER CRAYFISH, PROCAMBARUS CLARKII IN EGYPT359377339510.21608/ejabf.1997.3395ENNadia RamadanDept. of Zoology, Faculty of Science, Ain Shams Univ., Cairo, EgyptJournal Article20170618The present investigation is concerned with the protozoan parasites of the freshwater crayfish, Procambarus<br />clarkii, wnidv was accV&erxtatty introduced to the River Nile in Egypt during the 1980s. A total of 120 specimens were<br />collected from different water localities in Giza, Cairo and Qualyubia governorates, brought to the laboratory and<br />microscopically examined. Three protozoan parasites were detected either in the gills or in the connective tissue underneath the carapace. The most common parasite was the ciliate, Epistylis cambari, which was found on the gills of 36 out of the 120 specimens examined (30%). Another parasitic ciliate of the genus Tracheluis was also found on the gills of only 3 out of the 120 specimens examined (2.5%). Cysts of a third parasite, Psorospurmium sp. were detected in smears of the connective tissue underneath the carapace of a single specimen. The morphology of the three recorded parasites is described by light microscopy and the SEM structure of Epistylis cambari and its pathological effect on<br />the gills were also studied. The taxonomic position of Psorospurmium sp., which is recorded for the first time in Egypt<br />in the present investigation, was discussed. The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601A REVIEW OF THE TREMATODE GENERA HAPLOSPLANCHNUS LOOSS, 1902 AND PROHAPLOSPLANCHNUS TANG AND LIN, 1978 WITH REDESCRIPTION OF THREE SPECIES ISOLATED FROM MULLETS IN LIBYA.379395339610.21608/ejabf.1997.3396ENDayhoum Al- BasselDepartment of Zoology, Faculty of Science, Cairo University,Fayoum branch.Journal Article20170618The trematode genera Haplosplanchnus Looss, 1902 and Prohaplosplanchnus Tang and Lin, 1978 were reviewed. H.<br />indica Gupta and Ahmad, 1979, H. mugitis Nahhas and Cable, 1964 and P. diorchis Tang and Lin, 1978 were redescribed from Mugil capito from Libya. The three species were reported for the first time in Libya while H. mugilis and P. diorchis were reported for the first time from Mugil capito. A comparison between the previous results on 13 species of the genus Raplosplanchnus were presented.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601INCIDENCE AND PREVALENCE OF SOME PROTOZOAN PARASITES INFECTING THE NILE FISH OREOCHROMIS NILOTICUS IN EGYPT397430339710.21608/ejabf.1997.3397ENKoura A.Girls College for Arts, Sciences & Education, Ain Shams Univ.Kamel G.Girls College for Arts, Sciences & Education, Ain Shams Univ.Abd El-Aziz M.Faculty of Science, Al-Azhar UniversityEl-Deep I.Girls College for Arts, Sciences & Education, Ain Shams Univ.Journal Article20170618The present study was carried out as a general survey searching for the possible protozoan parasites that can infect the Nile fish Oreochromis (Syn: Tilapia) niloticus. A total of 217 live fish specimens were obtained from the River Nile at Giza district (Pharaonic Village, Imbaba and El-Warak). Examination of the investigated fish species in this study<br />revealed that fishes are infected with numerous protozoan parasites which have pathological effects on the host fish with subsequent economic losses. 15 different species belonging to 6 genera of parasitic protozoa were detected. Identification of parasites, their incidence, and intensity of infection were discussed. Generally, the detected protozoan parasites were classified into three main categories: 1- Ectoparasites: Under which 5 different species were detected.<br />2- Myxosporea: Under which 3 species of the genus Myxobolus were detected.<br />3- Coccidia: Under which 7 different species were recorded: three of Isospora; two of Eimeria and two coccidian oocysts of<br />unidentified species. Among the obtained parasites, the following were recovered for the first time from O.niloticus in Egypt, Myxobolus sp1. Myxobolus sp3. Isospora sp1.<br />Isospora sp2. Isospora sp3. Eimeria sp1., Eimeria sp2. and the two<br />unidentified species of coccidianThe Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601STUDIES ON SOME ENTERIC HELMINTHES OF NILE FISHES FROM SHARKIA PROVINCE, LOWER EGYPT431451339810.21608/ejabf.1997.3398ENMahmoud D.Animal Health Research Institute, Dokki.Nashaat MahmoudAnimal Health Research Institute, Dokki.Salah Abu El-WafaParasitology Department, Faculty of Veterinary Medicine Mansoura University.Ahmed Abd El-AalAnimal Health Research Institute, DokkiJournal Article20170618The present work aims to determine the enteric helminth parasites which infest two of the most common Egyptian<br />freshwater fishes Clarias lazera and Oreochromis niloticus collected from different localites at Sharkia province.<br />Out of 554 examined fish specimens 293 (52.89%) were infested. The infestation rates were 81.27% in Clarias lazera and<br />23.25% in Oreochromis niloticus. Concerning the infestation with different helminth parasites among examined fish; Clarias lazera was infested with Orientocreadium batrachoides, Eumasenia degyptiacus, Polyonchobothium clarias, Monobothroides species, Botherio-ccphalus species, Procamallanus laeviconchus, P. cyathopharynx, Spinitectus<br />allaeri, Rhabdochona pellucida and R. aegyptiacus, while Oreochromis niloticus was infested only with Acanthosentis tilapiae. The effect of seasonal variation dynamics on the infestation rate with the different helminth parasites was also studied. The morphological characters of each parasite and single and mixed infestation in fish species were detected.<br />In the present study, Sharkia province is considered as a new locality for both Rhabdochona pellucida and R. aegypticus.The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)Egyptian Journal of Aquatic Biology and Fisheries1110-61311219970601LIGHT AND SCANNING ELECTRON MICROSCOPIC STUDY OF THE MORPHOLOGY OF THREE TREMATODE SPECIES FROM SOME NILE FISH.453447339910.21608/ejabf.1997.3399ENBadawy BadawyDepartment of Zoology, Faculty of Science, Tanta University, Egypt.Saied Noor El - DinDepartment of Zoology, Faculty of Science, Tanta University, Egypt.Nahla OmranDepartment of Zoology, Faculty of Science, Tanta University, Egypt.Mohamed MonaDepartment of Zoology, Faculty of Science, Tanta University, Egypt.Journal Article20170618The morphological characters of Acanthostomum spiniceps, A. abscondihim and Orientocreadium lazeri studied using light<br />microscope, and were supported by the scanning electron micrographs which showed that the tegument of A. spiniceps is<br />covered by triangular spines till the anterior half of the body, while the rest is free of spines. The oral sucker spines are broad with pointed end and partially or totally ensheathed with a pitted tegument, while the mouth opening surrounded by a row of dome-shaped papillae. The tegumental spines of A. absconditum are of two types; the first is scally, indented, closely packed and arise in the anterior part of the first third of the body, followed by elongate indented spines. The oral sucker spines are elongated and narrower than those of A. spiniceps and ensheathed with the tegument till the second third of its length. In O. lazeri the tegument is covered by claw-like spines with blunt tips and arranged in transverse rows<br />and diminished posteriorly. The oral sucker carries sensory papillae while the ventral sucker is provided with small spines in addition to sensory papillae.