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The stock of Hokkaido spring spawning herring Clupea pallasii collapsed in the middleof the 20th century. In the first half of the 20th century, large amounts of spawning herring werecaught by set nets at coastal spawning grounds off the coast of Hokkaido, Japan. Using the catchdata, we analyzed the mean length at age with respect to sea-surface temperature and densitydependentgrowth during the years 1910 to 1954 by generalized additive modeling (GAM). Thisstock is distributed at the southern boundary of the distribution range of Pacific herring, and we thushypothesized that high temperatures have a negative effect on growth. Our study shows that lengthof Hokkaido spring spawning herring is highly dependent on growth during the first years of life andon temperatures preceding and during the feeding season. Higher temperatures during winter havea negative effect on growth. We found only weak indications of density-dependent growth in thestock of Hokkaido spring spawning herring

Determinants of mean length at age of spring spawning herring off the coast of Hokkaido, Japan