Thiodan® insecticide on the follicular development of lambaris/ O inseticida Thiodan® sobre o desenvolvimento folicular de lambaris

Thiodan® is an organochlorine based in endosulfan which can cause morphological changes in fish tissues exposed to it depending on the concentration and exposure time. This study aimed to determine the [LC.sub.50]-96h of Thiodan® (350g [L.sup.-1] endosulfan) for lambaris females of Astyanax bimaculatus in a reproduction period and analyze the morphology of follicular development in different experiments. Four experiments were performed: without adaptation and no feeding, feeding without adaptation, with adaptation and without feeding, with adaptation and feeding. The [LC.sub.50]-96h determined was 13.6 µg [L.sup.-1], with a confidence interval from 10.1 to 18.4 µg [L.sup.-1] (P