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Rhythmic changes in testicular activity with lunar cycle in the forktail rabbitfish

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Testosterone, 11-ketotestosterone and 17α ,20β-dihydroxy-4-pregnen-3-one in the forktail rabbitfish Siganus argenteus peaked around the full moon and the last quarter moon, respectively. Since changes in these hormones were correlated with histological change in the testis, the present study provided conclusive evidence for importance of the lunar periodicity in the reproductive activity of the forktail rabbitfish.

Keywords: Siganus argenteus; histology; lunar periodicity; plasma steroid hormones; testis

Document Type: Research Article


Affiliations: Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, 3422 Sesoko, Motobu, Okinawa 905-0227, Japan

Publication date: February 1, 2003

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