1989 年 55 巻 4 号 p. 583-589
Distinct spawning stocks of herring populations in the Far Eastern waters were examined on their sex ratios, age compositions and initial growth rates.
Most populations were the same in regards to their sex ratios, but the Atsuta population showed an unequal ratio suggesting the existence of different ecological properties.
Six populations around Hokkaido Island showed lower mean ages but higher growth rates than four northern populations which were 9-11 cm in body length at the first year of life.
Variations in the mode of life of ten populations have been classified into the following three ecological types; lake type (spawning in brackish lake and no migration), shore type (spawning in saline shore and narrow migration) and sea type (spawning in shore and extensive migration).
Those ecological characteristics seem to be closely associated with dynamics of each population of the herring in the Far Eastern waters.