西部ベーリング海のアブラガニ資源に関する研究-I : 産卵周期

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In researches on the blue king crab, Paralithodes platypus BRANDT, in the Western Bering Sea, as carried out from August to October, the following results were obtained as to the spawning cycle. 1. Female crabs were classified into five groups as shown in following keys. Immature group: Eggs and thread-like substace sticking to pleopods are absent. Ovary is undeveloped. Virgin group: Ovary is fully ripe. Group of carrying eggs: Eggs are present and ovary is immature. Group of no carrying eggs: Eggs are absent but the thread-like substance is present. Ovary is fully ripe. Senile and injured group: Eggs and the thread-like substance are absent. Ovary is very thin. 2. The five developmental stages of female crabs are arranged as follows. Immature stage→ Virgin stage→ →Stage of carrying eggs ↔Stage of no carrying eggs→Senile stage It is deduced from this study that the periods of the stages of carrying eggs and of not carrying eggs are nineteen months and several months respectively and the spawning cycle is two years, which is different from the annual spawning cycle of the king crab, Parali-thodes camtschatica TILESIUS.
公益社団法人日本水産学会の論文