Effect of commercial formulation of four organophosphorus insecticides on the LH-induced germinal vesicle breakdown in the oocytes of a freshwater teleost, Mystus vittatus (Bloch)--a preliminary in vitro study.

Effect of commercial formulation of four organophosphorus insecticides such as malathion, phosdrin (mevinphos), birlane (chlorfenvinphos), and gardona (tetrachlorvinphos) on LH-induced in vitro germinal vesicle breakdown (GVBD) in the oocytes of Mystus vittatus was investigated using three concentrations for each insecticide. All of these insecticides could significantly inhibit the LH-induced GVBD in all of their concentrations except two lower concentrations of birlane. A probable mechanism of inhibition of reproduction by these insecticides is discussed in the light of present findings.