Acute toxicity of commercial grade organophosphate insecticide, quinalphos (25% emulsified concentration) to common carp (Cyprinus carpio) was tested through bioassay. The acute toxicity of quinalphos to the fingerlings exposed for 96 hr was found to be 2.75 ppm. For sub lethal toxicity study, the fish were exposed to two concentration viz., 1/10th of LC50 (0.275 ppm) and 1/5th of LC50 (0.55 pp...

The current study was designed to investigate the potential effect of Spirulina platensis, Arthrospira platensis, (SP) on tissue protection of Nile tilapia (Oreochromis niloticus) through estimation of P53 level. Five isonitrogenous and isocaloric rations containing graded levels of dried SP 5, 7.5,10, 15, and 20 g/kg diet were fed separately to five equal groups of O. niloticus fingerlings, ad...

Endotoxin of E. tarda grown in brain heart infusion broth at 30 degrees C for 18 hr was extracted by differential centrifugation. Fingerlings of H. fossilis (weighing 1-2 g) were allowed for hyperosmotic infiltration in the endotoxin at the rate of 0,2,4,8,16 and 20 mg/l. Mortality varied from 20-50% at 2 to 20 mg/ml. Toxin treated fishes were challenged 21 days post treatment with the same E. ...