About KASUGAI KIYOSHI
About 北海道総合研究機構 さけます・内水面水試 道東セ
About 北海道水産試験場研究報告
About Oncorhynchus keta
About Hokkaido
About seasonal variation
About littoral zone
About maturity
About age
About Oncorhynchus keta
About fish catch
About seasonal variation
About maturity
About age composition
About Fishes
About Fishing grounds and fishing conditions
About 北海道
About 沿岸
About 漁獲
About サケ
About 年齢
About 成熟度
About 季節変化