Fecundity of the Japanese Mitten Crab Eriocheir japonica(de Haan)

DOI Web Site 被引用文献2件 参考文献37件
  • Kobayashi Satoshi
    Laboratory of Functional Marine Biology, Graduate School of Agriculture, Kyoto University

この論文をさがす

抄録

Abstract: Fecundity of the Japanese mitten crab Eriocheir japonica was investigated at Tsuyazaki Beach, Fukuoka Prefecture, Japan. The numbers of eggs and hatched larvae counted in the laboratory were com bined and categorized by the number of ovipositions. When the number of oviposition could not be directly counted, it was estimated based on the appearance of the egg mass. The fecundity increased with increasing carapace width(CW)and decreased in the later ovipositions. It was estimated to range from120, 000(40mm in CW)to600, 000(70mm)in the first oviposition, 80, 000to300, 000in the second one and20, 000to80, 000in the third one. Females oviposit up to three times within one reproductive season and die without further moulting. Considering the energetic cost of migration, it may be more profitable to consume all accumulated energy within one reproductive season, and spawn many offspring while they are not ex hausted just after migration. Potential lifetime fecundity can be estimated from the total fecundity; it ranged from230, 000(40mm in CW)to980, 000(70mm). When compared to other marine grapsid crabs, maturity size and fecundity of the first oviposition of E. japonica are both larger, but the regression line describing the CW-fecundity relationship is similar to those of other grapsid crabs. Large fecundity per brood with large maturity size compensates for the decrease in their brooding time and lifetime fecundity.

収録刊行物

被引用文献 (2)*注記

もっと見る

参考文献 (37)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ