Effects of 4n-nonylphenol exposure on the reproductive behavior and testis histology of Jenynsia multidentata (Anablepidae: Cyprinodontiformes).

53. ROGGIO, A.; A. HUED, M. BISTONI

NATURA NEOTROPICALIS

ASOCIACIÓN DE CIENCIAS NATURALES DEL LITORAL

Lugar: Santa Fe; Año: 2012

0329-2177

Increasing evidence has shown that wild populations of aquatic animals are exposed to chemical compounds that behave as hormone mimics and disrupt their reproductive physiology. Fish species are sensitive bioindicators of water quality. The one-sided livebearing fish Jenynsia multidentata has a wide neotropical distribution and has been used as an excellent model in both laboratory and field studies. The main goal of the present work was to assess the effects of subchronic 4n-nonylphenol (4n-NP) exposure in J. multidentata. Adult males were exposed to 0, 20 and 40 g l-1 4n-NP during 14 days. 17estradiol (E2) was used as positive control. Reproductive behaviour, somatic indices, testis and liver histology were evaluated. Our results suggest that 4n-NP has adverse effects on reproductive behaviour and histological characteristics in males of J. multidentata. Individuals exposed to 4n -NP show similar alterations to those recorded in E2 treatments. The changes in the reproductive biology caused by exposure to xenoestrogens could potentially lead to long-term effects at population levels that may not always be immediately evident. To the best of the authors’ knowledge, this is the first report to evaluate the effects of 4n -NP on reproductive aspect of native fish species .