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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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Title: Comparison of growth histories of immature Japanese common squid Todarodes pacificus between the autumn and winter spawning cohorts based on statolith and gladius analyses
Other Titles: 平衡石と軟甲解析に基づくスルメイカ秋・冬生まれ群の未成体期における成長履歴の海域間比較
Authors: Song, Hyejin1 Browse this author
Yamashita, Norio2 Browse this author
Kidokoro, Hideaki3 Browse this author
Sakurai, Yasunori4 Browse this author →KAKEN DB
Authors(alt): ソン, ヘジン1
山下, 紀生2
木所, 英昭3
桜井, 泰憲4
Keywords: Age
Growth
Gladius
Statolith
Todarodes pacificus
日齢
成長
平衡石
軟甲
スルメイカ
Issue Date: Jul-2012
Publisher: Springer Japan
Journal Title: Fisheries Science
Volume: 78
Issue: 4
Start Page: 785
End Page: 790
Publisher DOI: 10.1007/s12562-012-0503-7
Abstract: 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.
Rights: © 2012 公益社団法人日本水産学会
The final publication is available at www.springerlink.com
© 2012 The Japanese Society of Fisheries Science
Type: article (author version)
URI: http://hdl.handle.net/2115/49799
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 桜井 泰憲

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