Data on the biology of the Japanese swimming crab, such as sexual dimorphism, size and weight structure, sex ratio, allometric growth, and fecundity were obtained in Sukhodol Bay (Ussuri Bay). The maximum carapace width was 116 mm and the largest weight was 340 g in males and 107 mm and 210 g, respectively, in females. The female to male ratio was 1.0: 2.4. The mean number of eggs in a clutch was 571300 (94000–1786000). Molting lasted from August through October, and a mass molt was recorded in August. As compared to crabs of the central part of the range, off the Korean Peninsula, Charybdis japonica in Ussuri Bay had larger size and higher fecundity. The breeding period in Ussuri Bay was slightly shifted from June–August to late June-September. The mass hatching of larvae occurred in July.
Russian Journal of Marine Biology – Springer Journals
Published: Jan 8, 2012
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