Abstract
Tilapia were exposed to sublethal methomyl concentrations of 0, 0.2, 2, 20 or 200 μg/L for 30 days, and then transferred to methomyl-free water for 18 days. The sexual steroid hormones 17β-estradiol (E2), testosterone (T), and 11-ketotestosterone (11-KT) in tilapia testes were examined at 0, 6, 12, 18, 24 and 30 days after methomyl exposure, and at 18 days after fish were transferred to methomyl-free water. There were no significant changes in the hormone parameters in testes of tilapia exposed to low concentration 0.2 and 2 μg/L methomyl compared with the controls. However, high concentration 20 and 200 μg/L methomyl had the potential to disrupt the endocrine system of male tilapia, as shown by an increase in E2 and a decrease in T and 11-KT in the testes. Thus, it would appear that the 2 μg/L methomyl might be considered the no-observed-adverse-effect level. Recovery data showed that the effects produced by the lower concentration of 20 μg/L were reversible but the effects were not reversible at the higher concentration of 200 μg/L.
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Acknowledgments
The authors acknowledge support from Natural Science Foundation of Jiangsu Province for Youth (No.BK20150117), Special Scientific Research Funds for Central Non-profit Institutes, Chinese Academy of Fishery Sciences (No.2015C02XK01) and China Agriculture Research System (No.CARS-49) for the financial supports.
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Meng, S.L., Qiu, L.P., Hu, G.D. et al. Responses and recovery pattern of sex steroid hormones in testis of Nile tilapia (Oreochromis niloticus) exposed to sublethal concentration of methomyl. Ecotoxicology 25, 1805–1811 (2016). https://doi.org/10.1007/s10646-016-1726-7
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DOI: https://doi.org/10.1007/s10646-016-1726-7