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首页> 外文期刊>うみ >Reproductive biology of two sillaginid fishes, Sillago sihama and S. aeolus, in tropical coastal waters of Thailand
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Reproductive biology of two sillaginid fishes, Sillago sihama and S. aeolus, in tropical coastal waters of Thailand

机译：Reproductive biology of two sillaginid fishes, Sillago sihama and S. aeolus, in tropical coastal waters of Thailand

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摘要

Reproduction in two co-occurring sillaginid fishes, Sillago sihama and Sillago aeolus, was investigated on the basis of 1,140 and 836 specimens, respectively, collected from Sikao Bay, Trang Province, Thailand, between May 2003 and April 2004. Histological examinations of go-nads showed that the smallest mature females and males in S. sihama were 117 and 106 mm in standard length (SL), respectively, and 113 and 109 mm SL, respectively, in S. aeolus. The body size at which 50 of individuals attained maturity was estimated to be 130 mm SL for both sexes in both species. The lowest spawnable gonadosomatic indices for female and male S. sihama were 0.53 and 0.04, respectively, and 0.47 and 0.03, respectively, in S. aeolus. Spawning occurred continuously throughout the year in both species, with peaks in activity between August and November (S. sihama) and July and December (S. aeolus). Oocytes at various developmental stages, together with post-ovulatory follicles, were found in the mature ovaries of both species during their spawning periods, suggesting that they are multiple spawners.

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