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タイトル: 夏季の中部北太平洋におけるサンマの成熟と日齢
その他のタイトル: Maturation and age in days of Pacific saury Cololabis saira (Brevoort) in the central North Pacific Ocean during the summer
著者: 巣山, 哲 著作を一覧する
桜井, 泰憲 著作を一覧する
島崎, 健二 著作を一覧する
キーワード: サンマ
発行日: 1996年 5月15日
出版者: 日本水産学会
誌名: 日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries
巻: 62
号: 3
開始ページ: 361
終了ページ: 369
出版社 DOI: 10.2331/suisan.62.361
抄録: The maturation process and age in days of female Pacific saury Cololabis saira (Brevoort) in the central North Pacific Ocean were examined based on histological observations and otolith daily growth increments. The maturation process of Pacific saury used in this study (243-342mm in knob length) was divided into 6 stages: early yolk vesicle stage, late yolk vesicle stage, yolk formation stage, maturation stage, atretic stage I, and atretic stage II. Atretic stage fish were considered to be post-spawning as many degenerated oocytes were observed. The large size group (more than 296mm), in which fish were more than 1.5 years old as estimated from daily growth increments in otoliths, contained spawning and post-spawning individuals, although all individuals from the medium size group (241-295mm), from 10 months to 1 year and 3 months old, were immature. Since post-spawning fish were seen to have recovered their initial condition factors, it is suggested that they survive beyond the first spawning season. Based on observations of asynchronously developing oocytes, it is considered that Pacific saury spawn several times during a single spawning season.
Rights: ©1996 公益社団法人日本水産学会 The Japanese Society of Fisheries Science
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 桜井 泰憲


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