<論文>1986年7月下旬に北部ベーリング海へ分布したシロサケOncorhynchus ketaについて

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概要

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• The distribution, age and size compositions, and feeding condition of chum salmon (Oncorhynchus keta Walbaum) were investigated in the northern Bering Sea between 60°N and 62°N, near St. Lawrence Island. The fish were captured with surface gilinets on July 23-27,1986. The abundance in catch per unit tan was between 0.9 and 2.7. The age-3 fish were dominant with 65-89 % of the total fish, followed by age 4-fish. The mean size of age-3 fish was 58-63 cm in fork length and 2,400-3,600 g in body weight. The gonad weight measured 8-375 g in female and 1-310 g in male. While immature fish occurred abundantly in the southern water, the mature fish prevailed in the northern water or near the Alaskan coast. The chum salmon fed mainly on amphipod Parathemisto libellula and pteropod Clione limacina in the offshore region. In the coastal region, they fed on variety of foods, including larval gadid, sandlance and sculpin. The feeding indices as percentage prey weight to body weight of fish were generally high, showing good feeding conditions of chum salmon.

• 北海道東海大学の論文
• 1989-03-30

著者

• Willette Mark

  Institute Of Marine Science University Of Alaska

• 西山 恒夫

  Department of Marine Sciences and Technology, School of Engineering, Hokkaido Tokai University

• 増田 紀義

  Faculty of Fisheries, Hokkaido University

• 増田 紀義

  Faculty Of Fisheries Hokkaido University

• 西山 恒夫

  Department Of Marine Sciences And Technology School Of Engineering Hokkaido Tokai University

関連論文

• 東部ベーリング海における海況とベニサケ(O. nerka)分布との関係：特に，1973年ブリストル湾系ベニサケの回帰異変に関する一考察
• ベーリング海東部海域における流網の直角投網よりみたサケ・マスの水平移動
• 1986年7月下旬に北部ベーリング海へ分布したシロサケOncorhynchus ketaについて
• サケマス初漁期にアッツ島南西方に発達する漁場の水理条件ならびに魚群について

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