Efeitos do Thiodan® sobre a morfologia do testículo de tilápia nilótica (Oreochromis niloticus) sexualmente imatura

• Autor(a) principal: Montoya, Luz Natália Franco
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4955
• topic: Oreochromis niloticus; Agrotóxicos; Histopatologia gonadal; Oreochromis niloticus; Agrochemicals; Gonadal histopathology; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA

The purpose was to evaluate the toxic effects caused by the acute exposition to the agrochemical endosulfan in its commercial formulation Thiodan®, in Nile tilapia sexually immature male individuals. The fishes were acclimatized during a 10 day period on laboratory conditions where they were maintained in glass aquariums with 50L water capacity, with continuous filtration and aeration, in a approximated temperature of 26 ± 1°C, pH around 7.0, and dissolved oxygen of 6,4 ± 0,8 mg/L. The fishes were divided in 4 groups, including a control group and three others exposed during 96h. at increasing toxic concentrations (0,5µg/L, 1,0µg/L e 1,4µg/L). On the 0,5µg/L exposed group were observed circumscribed areas of necrosis on the testes of some animals. On the 1,0µg/L and 1,4µg/L exposed groups, were found structural alterations on the spermatocysts, decreased primary spermatogonia populations, decreased testis area, as well as serious loss of tissue functionality because of necrosis and damage on the connective tissue. On the more serious cases, was observed severe necrosis of the testis with partial or total loss of the mesothelium. On the present study, the negative effects of Thiodan® over the testis morpho physiology of sexually immature Nile tilapia, was confirmed.