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We investigated the mechanism of temporal changes in yearly catches and resources of iceˆsh Salangichthys microdon in Lake Abashiri from 1936 to 2007. Iceˆsh have lived in Lake Abashiri since the early 1930s because of climate change and topographical features, and have been caught by commercial ˆsheries. Their population size ‰uctuated annually from 1 to 94 tons. The periodicity of one-year intervals relating to the life-history of iceˆsh was observed in yearly catches. Population sizes at the beginning of each ˆshing season were estimated to be 36,763× 103487,590×103 individuals based on the daily CPUE and the density of juveniles. The iceˆsh seem to be stimulated to migrate seaward by rising water and ‰ooding, resulting in an abrupt decline in commercial catches and high spawner abundance in the following year. The relationship between the number of adults and recruitment ˆtted well to Ricker's reproduction model.

Temporal change in catches and resources of icefish <i>Salangichthys microdon</i> in Lake Abashiri, eastern Hokkaido, Japan