Acute Toxicity of Abamectin to Fishes, Cyprinus carpio Linnaeus and Tilapia mosambica (Peters)

Laboratory studies conducted to determine the acute toxicity of abamectin, a broad spectrum pesticide to fresh water common carp, Cyprinus carpio (Linnaeus) and Tilapia mosambica (Peters) revealed that the fish are highly susceptible to abamectin. The median lethal concentration (LC₅₀) of abamectin for C. carpio and T. mosambica were 0.475 and 6.928 ppb, respectively. Likewise, the median lethal time (LT₅₀) were 3.119 and 1.804 h for abamectin at 0.50 and 0.55 ppb concentration to C. carpio and 19.039, 13.933 h for abamectin at 8.0 and 9.0 ppb concentration to T. mosambica, respectively.