夏季のオホーツク海南西部におけるズワイガニの分布と形態学的成熟サイズ  [in Japanese] Distribution and morphological maturation size of the snow carb, Chionoecetes opilio in the southwest area of the Okhotsk Sea in summer  [in Japanese]

1997〜2000年の夏季にオホーツク海南西部でトロールによりズワイガニ採集調査を行い,分布と成熟サイズを検討した。水深100〜300mで主に採集され,分布の中心は150〜200mで,300m以深ではほとんど採集されなかった。ズワイガニが採集された調査点の底層水温は-0.96〜6.00℃で,500個体/km^2以上採集された調査点では-0.96〜5.77℃の範囲に限定されていた。水深別甲幅組成から,雌雄とも深所ほど大型の個体が多かった。50%成熟率甲幅は,雄106.0mm,雌63.4mmであった。

Bottom trawl surveys were conducted over four consecutive summer seasons, 1997〜2000, to collect the snow crab Chionoecetes opilion the southwestern area of the Sea of Okhotsk. Almost all snow crabs were collected from depths of 100〜300 m, and especially high densities at the depth range of 150〜200 m. Few individuals occurred deeper than 300 m deep. Males and females were larger with greater depths. The range of bottom temperature at the stations where the snow crabs were collected was between -0.96 and 6.00℃, and the temperature of stations where more than 500 individuals/km^2 were estimated was between -0.96 and 5.77℃. The size at which 50 percent of individuals had finished the terminal molt was estimated at 106.0 mm and 63.4 mm in carapace width for males and females, respectively.