Seasonal-dependent effect of endosulfan exposure on gonadotropins of Cichlasoma dimerus (Perciformes, Cichlidae).

DA CUÑA, RODRIGO; PANDOLFI, MATIAS; PIAZZA, YANINA; MAGGESE, CRISTINA; VISSIO, PAULA; LO NOSTRO, FABIANA

CYBIUM

The French Society of Ichthyology

Lugar: Paris; Año: 2008 vol. 32 p. 54 - 54

0399-0974

Adult C. dimerus were exposed for 2 months to endosulfan (ES)during summer or winter. Pituitaries were processed for Western blot (WB) or immunohistochemistry (IHQ)to evaluate LH and FSH content. WB showed a decrease in the pituitary ir-FSH content and an increase in that of LH in exposed fish during summer, correlating with the morphometric analysis of ir-cells.In winter the opposite tendencies were observed in pituitary content. This supports the role of ES as an endocrine disruptor and the existence of seasonal variations in gonadotropin’s responsiveness to ES.