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Sunrival, growth, and various measures of reproductive performance were examined for an estuarine mysid, Mysidopsis bahia, throughout its life cycle during exposure to the organophosphate insecticide, fenthion (0,O-dimethyl 0-13-methyl-4-(methylthio) phenyl] phosphorothioate). Concentrations of fenthion responsible for lethality (300 ng 1-') did not vary significantly between that observed after 4 d exposure of newly released juvenile mysids and that produced with continuous exposure through maturation and production of young. Exposure of maturing juveniles to 166 ng fenthion 1-' postponed the onset of reproduction by 4 d. Both individual fecundity of females and total population production of young were reduced by fenthion concentrations of 79 ng 1I and higher. Suppression of mysid growth rates was evident after only 4 d exposure of juvenile mysids to a sublethal fenthion concentration of 166 ng 1 l ; a lower concentration (79 ng I' ) retarded growth rates of the more rapidly growing advanced juveniles after approximately 2 wk exposure. Reduced survival capacity, retarded growth rates, and diminished reproductive success of mysid populations with chronic, low-level exposure to fenthion would result in lowered production rates of an important prey population for commercially important fish that utillze the estuary as a nursery.

diseases of aquatic organisms

Influence of the organophosphate insecticide fenthion on Mysidopsis bahia exposed during a complete life cycle. I. Survival, reproduction, and agespecific growth