Fecundity of Colisa fasciatus (Bl. & Schn.) as an Index of Distillery effluent toxicity

In beginning of 21 century, various industries have been set up for boosting the production of various substances of commercial importance. A distillery factory has been established in industrial development area of Gorakhpur (GIDA). It releases its effluent in the adjoining field/aquatic bodies that directly or indirectly pose a threat to aquatic biota in general and fishes in particular. Present paper deals with effect of different concentrations of distillery effluent (5, 10 & 20%) on fecundity of Colisa fasciatus (Bl. & Schn.) a freshwater tropical perch. Observations reveal that 5% distillery effluent concentration brought least significant declining in the fecundity of experimental fish Colisa fasciatus. However, 10 and 20% effluent concentration produced significant (p<0.05-0.01) declining in the fecundity in this fish after 30 days of exposure during late spawning phase. Causes for declining in absolute fecundity has been illustrated.