Oestrogenic contaminants in the aquatic environment are associated with endocrine disruption and feminisation in fish. The effects of endocrine disrupting chemicals (EDCs) on fish have been well documented. However, very few studies have focused on 17 ?-oestradiol (E2) and its effects on endocrine system and biotransformation in a single prolonged exposure. This study investigated changes in the levels of serotonin (5-hydroxytryptamine) and acetyl choline esterase (AchE) in brain, cortisol in plasma and Ethoxyresorufin-O-deethylase (EROD) activity in gill of two different size groups (fingerlings and juveniles) of Japanese sea bass (Lateolabrax japonicus) upon exposure to two sub-lethal concentrations (200 and 2000ngL(-1)) of E2 for 30d. The results indicate that cortisol level and EROD activity significantly increased in both groups, whereas serotonin level increased in juveniles and decreased in fingerlings due to E2 exposure. The correlation analysis revealed that E2 significantly affected the endocrine and biotransformation systems in both age groups.
Authors: Thilagam H, Gopalakrishnan S, Bo J, Wang KJ. ;Full Source: Marine Pollution Bulletin. 2014 Aug 30;85(2):332-7. doi: 10.1016/j.marpolbul.2014.05.024. Epub 2014 May 29. ;