IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The influence of environmental pollution in the vitellogenesis of Astyanax fasciatus (Characiformes: Characidae)
Autor/es:
KUMAR, A.; HONJI, R.; TOLUSSI, C.E.; LO NOSTRO, F.; GUIMARAES MOREIRA, R.; GOMES, A.D.; BAIN, P
Lugar:
Gothenburg
Reunión:
Simposio; 8TH International Symposium on Fish Endocrinology; 2016
Institución organizadora:
ISFE
Resumen:
Chemicals present in the aquatic environment can alter the physiological processes of fish, such as reproduction. The aim of this study was to investigate the influence of environmental pollution on vitellogenesis of Astyanax fasciatus in two reservoirs from the same basin, with different degrees of eutrophication,located in São Paulo State (Brazil). Adult females were sampled during two years in the Ponte Nova (PN, reference site) and Billings (Bil, polluted site) reservoirs.Water samples were collected to evaluate physical and chemical parameters. Ovarian histology;relative fecundity (RF);gonadosomatic index (GSI);estradiol plasma levels (E2); VTG plasma absorbance;VTGand estradiol receptor (ER) gene expressionwere analysed. The water analysis confirmed the presence of pollutants in Bil, mainly high metal levels.Ovaries sampled in both reservoirs were mature throughout the year. Females from PN maintained a seasonal variation in GSI, FR, plasma E2 and plasma VTG, while these variables remainedalmost unchangedin animals fromBil.Females living in Bil showed higher GSI, FR, and plasma E2 than PN ones, mainly during the non-breeding season. VTG and ER gene expression did not change neither during the year nor comparing both reservoirs, except for an unexpected VTG peak in Bilduring summer. A. fasciatusshoweda high allostatic capacity toadjust the physiological set-points, allowingvitellogenesisin an impounded environment, at the expense of high E2 levels.