Abstract
Susceptibility of carp, Cyprinus carpio, to 8 pesticides was evaluated at various stages in their life cycle from eyed eggs to fingerlings about 5cm in length. No remarkable change in susceptibility with growth was observed to trichlorfon, fenitrothion, phenthoate, diazinon and IBP (O, O-diisopropyl S-benzyl phosphorothiolate), which are organophosphorus insecticides or a fungicide, or to pentachlorophenol-sodium herbicide, showing that the chorion of the egg was not an effective barrier to permeation of these pesticides. However, susceptibility to chlornitrofen herbicide and endosulfan insecticide was low at the eyed egg stage, increased during the early growth stages and decreased with further growth. Data from the present study and others suggests that age-susceptibility patterns produced in carp can be grouped on the basis of chemical structure or mechanism for toxicological action of pesticides as in the case of the mallard duck, Anas platyhrynchos.
