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Hokkaido University Collection of Scholarly and Academic Papers >
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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
| 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)
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Submitter: 桜井 泰憲
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