北海道及び樺太に於けるタラバカニの Stock に關する一二の知見

抄録

The data on which the present paper is based consist of the records concerning the tagging experiments, the measurements of the carapace-breadth, and the statistics of the catches already published by Imperial Fisheries Experimental Station, Hokkaido Fisheries Experimental Station, and Sagbalin Fisheries Experimental Station. The analysis of the data has revealed that (1) the stock of the crab in each of four regions, viz., (a) Pacific coast of Hokkaido, (b) Okhotsk coast of the same, (c) coast of the same bordering the Japan Sea, and (d) the coast of Saghalin is almost independent from any other; (2) the male in the catch off Prov. Kitami of Hokkaido is mainly constituted by 4-5 year old ones, but the catch from Saghalin is mostly comprised in 5-6 year old males and 6-year old females; and (3) successive yearly survival rate is •32-•42.