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Population structure and migration of walleye pollock in the western coastal area of Hokkaido.

Research Project

Project/Area Number 62560181
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field General fisheries
Research InstitutionHokkaido University

Principal Investigator

MAEDA Tatsuaki  Hokkaido University, Faculty of Fisheries, Professor, 水産学部, 教授 (00001595)

Co-Investigator(Kenkyū-buntansha) TAKAGI Shogo  Hokkaido University, Faculty of Fisheries, Instructor, 水産学部, 助手 (60179421)
NAKATANI Toshikuni  Hokkaido University, Faculty of Fisheries, Instructor, 水産学部, 助手 (80188979)
TAKAHASHI Toyomi  Hokkaido University, Faculty of Fisheries, Associate Professor, 水産学部, 助教授 (40002349)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsWalleye pollock / Northern Japan Sea / Fishing and hydrographic conditions / Fish migration / Size composition / Vertical distribution / Dominant year class / 海況 / 魚群の分布回遊 / スケドウダラ / 分布回遊
Research Abstract

To elucidate the population structure and migration of walleye pollock, Theragra chalcogranna, in the western coastal area of Hokkaido, sampling surveys were conducted in Japan Sea from Shiribeshi to Aomori Prefecture from April 1987 to October 1989 . Distribution of walleye pollock was observed by echo surveys and mid-water trawling. Zooplankton was collected by vertical hawls with Norpac net from 500 m depth to the sea surface. Hydrographic observations were carried out with CrD system. In February, tagging experiments were conducted to know the migration after spawning. Results are summarized as follows;
1. Shoal of Walleye pollock in April was found in 150-300 m depth near the spawning area, while in 200-400 m depth in the offshore area. Distribution of Walleye pollock expanded to the central area of Japan Sea, concentrating in the frontal zone between the Tsushima Warm Water and the Liman Cold Water.
2. Walleye pollock migrated to the shallower area in October with advancement of go … More nad maturation. In this period, they concentrated in deep layer from 400 m to 500 m, because of high temperature,
3. Population in this area was mainly constituted by 3-8 year classes and the 1984 year class dominated. The highest biomass of walleye pollock was observed in October, 1989.
4. The 2500 tagged fish were released from 1987 to 1989 in the coastal area of Hiyama. Results of recapture showed that walleye pollock migrated to the south from Toyama to Tsugaru Straight during the summer feeding season and retored in this study area prior to the spawning season. These suggest that they have strong homing instinct.
5. Formerly, it has been believed that walleye pollock migrated from the northern area (Musashi Bank) to this study area and returned after spawning. However, it was found that they migrated from southwestern area to the coastal spawning grounds. Prediction of population density requires further observations concerning the transport process of fish eggs and larvae, and ecology of immature fish. Less

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 前田辰昭: "北海道檜山沖合におけるスケトウダラ成魚群の分布回遊と産卵場について" 北海道大学水産学部研究彙報. 39(4). 216-229 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 前田辰昭: "北海道南西部の日本海岸におけるスケトウダラの回遊について" 水産海洋研究会. 53(1). 38-43 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 前田辰昭: "北海道檜山および後志沖合におけるスケトウダラ成魚の分布回遊" 昭和63年度漁業資源研究会議・北日本底魚部会会議報告・水産庁. 22. 1-18 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Tatsuki Maeda: "Distribution and migration of adult walleye pollock off Hiyama,South western Hokkaido." Proceeding of the International Symposium of the Biology and management of Walleye Pollock.Alaska Sea Grant College Program University of Alaska.89-1. 325-347 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Maeda T., T. Takahashi, and T. Nakatani: "Distribution, migration and spawning grounds of adult walleye pollock Theragra chalcogramma in the coastal waters of Hiyama Subprefecture, Hokkaido (In Japanese with English summary)." Bull. Fac. Fish. Hokkaido Univ., 39(4), 216-229, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Maeda T., T. Nakatani, T. Takahashi, S. Takagi, Y. Kajiwara, and T. Meguro: "On migration of walleye pollock in the coastal waters of the southwestern Hokkaido (In Japanese)." Bull. Japan. Soc. Fish. Oceanogr., 53(1), 38-43, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Maeda T., T. Nakatani, T. Takahashi, and S. Takagi: "Distribution and migration of adult walleye pollock off Hiyama, southwestern Hokkaido." Proc. Int. Symp. Biol. Mgmt. Walleye Pollock, Nov. 1988, Anchorage, Alaska, 89-1, 325-347, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Maeda T., T. Nakatani, T. Takahashi, S. Takagi, Y. Kamei, Y. Kajiwara, and T. Meguro: "Distribution and migration of adult walleye pollock off Hiyama and Shiribeshi, Hokkaido (In Japanese)." Rep. Northern Japan demersal fish, 22, 1-18, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 前田辰昭: "北海道檜山沖合におけるスケトウダラ成魚群の分布回遊と産卵場について" 北海道大学水産学部研究彙報. 39(4). 216-229 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 前田辰昭: "北海道西南部の日本海岸におけるスケトウダラの回遊について" 水産海洋研究会. 53(1). 38-43 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 前田辰昭: "北海道檜山および後志沖合におけるスケトウダラ成魚の分布回遊について" 昭和63年度漁業資源研究会議・北日本底魚部会会議報告、水産庁. 22. (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Tatsuaki Maeda: "Distribution and migration of adult wolleys pollock off Hiyama,South western Hokkaido." Proceeding of the International Symposium of the Biology and management of Walleye Pollock.Alaska Sea Grant college Program University of Alaska. 89-1. 325-347 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 前田辰昭: 北海道大学水産学部研究景報. 39(4). 216-229 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 前田辰昭: 水産海洋研究. 53(1). 38-43 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 前田辰昭: 昭和63年度漁業資源研究会議 北日本底魚部会会議報告書.

    • Related Report
      1988 Annual Research Report
  • [Publications] 前田辰昭・中谷敏邦・高橋豊美・高木省吾・梶原善之・目黒敏美: 水産海洋研究会報. 52-4.

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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