Recruitment fluctuations and biological responses of walleye pollock in the Pacific coast of Hokkaido

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  • Recruitment fluctuation and biological responses of walleye pollock in the Pacific coast of Hokkaido

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We review published/unpublished information on the early life stage of walleye pollock along the Pacific coast of Hokkaido. Evidence of the recruitment fluctuations was suggested by cohort analysis, and the 1995 year class was recognized as the strongest year class in the last two decades. The highest distribution of eggs was observed in the vicinity of Funka Bay, the southwestern part of Hokkaido. Egg transport and match/mismatch processes are pointed out as possible causes of recruitment fluctuations during the larval stages. In August 2000, we observed a high-density juvenile aggregation in the eastern Pacific Hokkaido. The estimated hatch dates of juveniles ranged between early-January and mid-March, suggesting they originated from Funka Bay. We suggest that the juveniles migrate from Funka Bay to the eastern Pacific Hokkaido during their first summer and that they use this area as for a nursery ground. Larval transport, migration mechanism and environmental conditions in the nursery area may also be important in establishing year-dass strength.

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