Protogynous hermaphroditism in the parrotfish,Calotomus japonicus |
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Authors: | Janny Dirk Kusen Akinobu Nakazono |
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Institution: | 1. Faculty of Fisheries, Sam Ratulangi University, Manado, Indonesia 2. Department of Fisheries, Faculty of Agriculture, Kyushu University, Higashi-ku, Hakozaki, 812, Fukuoka, Japan
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Abstract: | Sexual patterns of the parrotfish,Calotomus japonicus, were studied using fifteen specimens collected in February and April, 1990, near Makurazaki, Kagoshima Prefecture. The males
ranged from 265 to 345 mm SL, and were larger than the females on average. Most females ranged from 202 to 260 mm SL, but
a female of 305 mm SL was obtained. Sexual dichromatism was conspicuous. Histological examination of the gonads and low values
of gonado-somatic indices of both males and females indicated that they were not in spawning season. It was concluded that
C.japonicus is a protogynous hermaphrodite, because all male specimens had secondary testes. It was pointed out that the present species
has a weak size-sex relationship. Because the specimens examined did not include primary males, it is suggested that primary
males are relatively rare, if they occur at all. |
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Keywords: | |
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