Comparison of growth histories of immature Japanese common squid Todarodes pacificus between the autumn and winter spawning cohorts based on statolith and gladius analyses
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概要
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Growth of the autumn and winter spawning cohorts of the Japanese common squid Todarodes pacificus was examined based on daily growth increments in the statolith and gladius. The samples comprised three groups of young (≤180 days-old) squid: autumn cohort collected in the Tsushima Current and winter cohort collected in the Pacific near the coast and 1100 km offshore. The growth rate based on statolith analysis was highest in the winter cohort collected near the coast and similar in the two other groups. The daily growth based on gladius analysis during the month before capture was also highest in the winter cohort collected near the coast and fluctuated more in the autumn cohort than in the winter cohort. The results suggest that gladius growth increments will be an important tool in future studies of growth in T. pacificus.スルメイカの秋・冬生まれ群の未成体期の成長履歴を，平衡石と軟甲を用いて調べた．解析には，秋生まれ群は山陰沖の対馬暖流域，冬生まれ群は岩手沖の沿岸と沖合域の計3定点で採集した標本（外套長66-158mm）を用いた．その結果，平衡石による日齢と成長の関係から，太平洋沿岸域が他の2海域よりも成長速度が速かった．再捕前1か月間の軟甲の日間成長解析では，岩手沿岸の冬生まれ群が最も良く，山陰沖の秋生まれ群では成長履歴の個体差は冬生まれ群より大きかった．軟甲による成長解析は，今後のスルメイカ成長履歴研究に有効と判断された．
- 2012-07-01
著者
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KIDOKORO Hideaki
Japan Sea National Fisheries Research Institute
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Kidokoro Hideaki
Japan Sea National Fisheries Research Institute Fisheries Research Agency
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Sakurai Yasunori
Faculty Of Fisheries Hokkaido University
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Song Hyejin
Graduate School Of Fisheries Sciences Hokkaido University
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Sakurai Yasunori
Faculty Of Fisheries Sciences Hokkaido University
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YAMASHITA Norio
Hokkaido National Fisheries Research Institute, Fisheries Research Agency
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Yamashita Norio
Hokkaido National Fisheries Research Institute Fisheries Research Agency
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