Parasitic Nematodes Decrease Fecundity in the Western Mosquitofish, Gambusia affinis

I tested effects of infection by the parasitic larval nematode Eustrongylides ignotus on reproduction in the livebearing western mosquitofish Gambusia affinis. Generally, parasitized females had fewer developing broods than nonparasitized females. Parasitic nematodes significantly reduced fecundity in the western mosquitofish.