Comparative study of body composition of different fish species from brackish water pond

Seven species of fish [Catla catla, Cirrhinus mrigala, Cyprinus carpio, Hypophthalmicthys molitrix, Labeo rohita, Mori-Rahu Hybrid and Thalla-Rahu Hybrid] were collected from a brackish water pond near Muzaffargarh, Pakistan for the comparison of body composition. All the seven species were found relatively well adapted to the saline environment though some of them showed significant differences in body composition. Results obtained did not show any adverse effect of salinity on these fish species. The mean values of body constituents, except for protein content [dry and wet body weight] differed significantly [P<0.05] among various fish species. Minimum amount of water content and maximum amount of lipids, organic content and condition factor were observed in Cyprinus carpio indicating that Cyprinus carpio show overall better growth in brackish water as compared to other species. Cyprinus carpio may be recommended for culturing in such water bodies and farmers may be encouraged to farm this species on mass scale

Monitoring of chlorinated hydrocarbons in some fish species from Edku lake and Abu-Quir bay

The level of chlorinated hydrocarbons is detected in different fish samples from two sampling sites Edku lake and Abu-quir bay. HCH, DDE, DDD, endrin, DDT and polychlorinated biphenyls [PCB's] were the major detected chlorinated hydrocarbons. DDE is the major detected DDT metabolite in fish samples. The ratio of to alpha to gamma -HCH isomers in different fish species from lake Edku is higher than Abu-quir fish samples, the level of chlorinated pesticides in Tilapia fish El-Maadeia is higher than Edku fish and positively correlated with the tissue fat content. Polychlorinated biphenyl [PCV's] as Arochlor 1260 is detected more frequently in Abu-quir fish samples than Edku