山田湾産ホッカイエビの生態学的研究-I : 成長および抱卵期間について

概要

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The paper deals with growth and the egg carrying period of the “Hokkai-ebi”, Pandalus kessleri CZERNIAVSKI, collected from the Yamada Bay, Iwate Prefecture, the area recognized as the southern limit of the dsitribution of this species. The relationship among the total, body and carapace lengths can be expressed by a linear equation. The weight-length relationships were also observed essentially as straight lines on a log scale.The prawns soon after hatching were 8.3mm in average body length in March, and grew to 59.1mm 12 months after and 88.7mm 24 months after. It is certain that the growth of the prawn is almost arrested during winter. As compared with the Hokkaido data, the growth in the area of the present study appears better over that of the Notsuke Bay, but is not so good as that of the Akkeshi Bay.It seems that the prawn lay their eggs in the middle or the end of October, carry them over winter, and hatch them from late March to early April. So the egg carrying period was estimated to be five months or six months. This result is shorter than that of the Hokkaido study. The product of time and water temperature of the carrying period in the Yamada Bay was similar to that of the Hokkaido area.
公益社団法人日本水産学会の論文