Reproductive biomarkers to identify endocrine disruption in Clarias gariepinus exposed to 4-nonylphenol

Assessment of the health status of wild fish inhabiting a cotton basin heavily impacted by pesticides in Benin (West Africa)

“…According to Mills et al (2001), the decrease in the GSI is usually explained by the presence of histopathological changes in the gonads (gonad regression). In this study, the lower GSI observed in males from the contaminated sites may be related to the presence of histopathological alterations most likely resulting from exposure to agricultural pesticides as previously reported by other authors (Jobling et al, 1996;Christiansen et al, 1998;Gimeno et al, 1998;Mdegela et al, 2010;Sayed et al, 2012). In the females, the decrease in the GSI could be attributed to the degeneration of the ovaries, particularly in the downstream site of the Alibori River (S4) (Scholz and Gutzeit, 2000).…”

“…Plasma sex steroids Many authors have investigated the effects of agricultural pesticides on the hormonal regulation of fish reproduction (Gimeno et al, 1996;Mckinlay et al, 2008;Palma et al, 2009aPalma et al, , 2009bSayed et al, 2012;Da Cuña et al, 2013). In this study, the plasma levels of androgens (T and 11-KT) were generally lower in fish from contaminated sites (especially in fish from S4), whereas the levels of E2 were significantly higher at this site compared with fish from the reference site, regardless of the species, sex or season.…”

Pesticides used in cotton production affect reproductive development, endocrine regulation, liver status and offspring fitness in African catfish Clarias gariepinus (Burchell, 1822)

“…Many authors (Gimeno et al, 1996;Mckinlay et al, 2008;Palma et al, 2009a,b;Sayed et al, 2012;Da Cuña et al, 2013) have investigated the effects of agricultural pesticides on the hormonal regulation of fish reproduction. In the present study, plasma E2 and 11-KT for both sexes decreased in Tihan exposed African catfish.…”

Estrogenic effects along the river saale

“…Although a number of reports have been made about possible effects of nonylphenols on fish [35][36][37], information about the impact on sediment-dwelling organisms is comparatively scarce. The presence of estrogen receptors or binding proteins was demonstrated in the free-living nematode species Panagrellus redivivus and Caenorhabditis elegans by Hood et al [38].…”