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夏季の中部北太平洋におけるサンマの成熟と日齢

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Title: 夏季の中部北太平洋におけるサンマの成熟と日齢
Other Titles: Maturation and age in days of Pacific saury Cololabis saira (Brevoort) in the central North Pacific Ocean during the summer
Authors: 巣山, 哲1 Browse this author
桜井, 泰憲2 Browse this author →KAKEN DB
島崎, 健二3 Browse this author →KAKEN DB
Authors(alt): Suyama, Satoshi1
Sakurai, Yasunori2
Shimazaki, Kenji3
Keywords: サンマ
成熟過程
日齢
中部北太平洋
Issue Date: 15-May-1996
Publisher: 日本水産学会
Journal Title: 日本水産学会誌
Journal Title(alt): Bulletin of the Japanese Society of Scientific Fisheries
Volume: 62
Issue: 3
Start Page: 361
End Page: 369
Publisher DOI: 10.2331/suisan.62.361
Abstract: 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
© 1996 The Japanese Society of Fisheries Science
Type: article
URI: http://hdl.handle.net/2115/35565
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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