Abstract
We investigated the effects of 30–480 ng/L 17α-ethinylestradiol (EE2) on the sperm motility and fertility of Japanese medaka (Oryzias latipes). Sperm motility was examined by computer-assisted image analysis. In male medaka, the velocity of sperm was found to have increased after 3 weeks of exposure at 60–480 ng/L. This result suggests that higher sperm velocities depleted sperm energy reserves more rapidly and shortened the time for which sperm were viable to fertilize eggs. In a separate experiment that studied whether EE2 exposure of males affects the fertilization rate or hatchability, sexually mature male medaka were exposed for 3 weeks and subsequently evaluated for their reproductive ability after pairing with unexposed females for 7 days. Exposure of males to EE2 exerted a potent inhibitory effect on a reproduction parameter (fertilization rate × hatchability), and the highest inhibition was observed at 60 ng/L. The results offer toxicological data for the assessment of EE2 exposure in medaka and suggest that short-term exposure to EE2 might reduce sperm function and fertility in adult male medaka.
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Acknowledgments
We thank Dr. T. Iwamatsu for helpful discussions. This study was supported in part by a grant for a Long-Range Research Initiative (LRI) by the Japan Chemical Industry Association (JCIA) and a grant from the Ministry of Education, Culture, Sports, Science and Technology of Japan (No. 15201003).
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Hashimoto, S., Watanabe, E., Ikeda, M. et al. Effects of Ethinylestradiol on Medaka (Oryzias latipes) as Measured by Sperm Motility and Fertilization Success . Arch Environ Contam Toxicol 56, 253–259 (2009). https://doi.org/10.1007/s00244-008-9183-9
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DOI: https://doi.org/10.1007/s00244-008-9183-9