Toxicity of mosquitocides on freshwater mussel larvae.
The effect of four insecticides also used for mosquito-killing (Fyfanon ULV, K-Othrin ULV, Unitox 7 ULV and Unitox 20 ULV) was studied on the larvae (glochidia) of two freshwater mussel species, Anodonta cygnea and Anodonta anatina. In addition to the determination of the 24-96 h LC50 values of the insecticides, studies were also performed on their effect exerted on a physiological process, the tryptamine-(TA)-induced activation of the larvae in normal and 24 h test. On the basis of the LC50 values, Fyfanon and Unitox 20 were found to be the most toxic to the studied mussel larvae, however, the TA-induced adductor muscle activity, as physiological process, was also inhibited by Unitox 7 in relatively low concentrations. This effect may reduce the chance of further development of the larvae, by exerting harmful effect on the number of freshwater mussels.
D000818:Animals; D049872:Bivalvia / Q000187:drug effects*; D009033:Culicidae; D005618:Fresh Water; D007306:Insecticides / Q000633:toxicity*; D007814:Larva / Q000187:drug effects; D007928:Lethal Dose 50; D009119:Muscle Contraction / Q000187:drug effects; D014363:Tryptamines / Q000494:pharmacology
D007306:Insecticides; D014363:Tryptamines; C030820:tryptamine