Effects of Commercial Detergent On The Juveniles of Heterobranchus Longifilis (CURVIER AND VALIENNCES)
The effects of commercial detergent (OMO brand) on the juveniles of Heterobranchus longifilis was studied under in vivo conditions in the laboratory. Fry of one week old H. longifilis were distributed into glass aquaria of 3 liter capacity containing 1 liter of detergent at various concentrations (5, 10, 15, 20 and 25mg/l). Abnormal changes observed in the behavior of fish in the test solutions that were not observed in the control were hyperplasia of gill membrane, erosion and fusion of gill lamellae, erratic swimming, moribund activities and death. The concentration of detergents in which 50% mortality (LC50) occurred were 30mg/l in 48h; 20mg/l in 72h and 15mg/l in 96h respectively. The implications of these results on the continuous dumping of detergents into the aquatic environments are discussed.