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Annual life cycle of adult marbled sole Pleuronectes yokohamae in the coastal waters around Kikonai Bay, Hokkaido, Japan

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Title: Annual life cycle of adult marbled sole Pleuronectes yokohamae in the coastal waters around Kikonai Bay, Hokkaido, Japan
Other Titles: 北海道木古内湾におけるマコガレイ成魚の生活年周期
Authors: Shafieipour, Mohamad M. Browse this author
Takahashi, Toyomi2 Browse this author
Ishino, Kengo3 Browse this author
Konno, Yukihiro4 Browse this author
Nakao, Hiromi5 Browse this author
Sano, Mitsuhiro6 Browse this author
Tominaga, Osamu7 Browse this author
Takatsu, Tetsuya8 Browse this author →KAKEN DB
Authors(alt): 高橋, 豊美2
石野, 健吾3
今野, 幸弘4
中尾, 博己5
佐野, 満廣6
富永, 修7
髙津, 哲也8
Keywords: Pleuronectes yokohamae
Annual life cycle
Spawning season
Feeding intensity
Issue Date: 2004
Publisher: 日本水産増殖学会
Journal Title: 水産増殖
Journal Title(alt): Aquaculture Science
Volume: 52
Issue: 4
Start Page: 351
End Page: 358
Abstract: To clarify the annual life cycle of adult marbled sole Pleuronectes yokohamae in the coastal waters around Kikonai Bay, the seasonal changes in gonadosomatic index, hepatosomatic index, and condition factor of samples obtained with commercial set nets and research bottom trawl nets during May 1994 through October 1996 were examined. In addition, feeding intensity was investigated using a stomach contents index and noting the percentage of empty stomach. The annual life cycle of adult P. yokohamae was divided into the following three periods: spawning (February-April), active feeding and recovering (May-July), and inactive feeding (August-January). The inactive feeding period was further divided into two sub-periods: immature (August-October) and mature (November-January). It seems likely that P. yokohamae in this study area feeds intensively after spawning and matures under these high levels of nutrition.
木古内湾に生息するマコガレイ成魚の生活年周期を明らかにするため,1994年5月から1996年10月までの期間,底建網と底曳網で得られた標本の生殖腺体指数 (GSI),肝臓重量指数 (HSI),肥満度 (CF),胃内容物重量指数 (SCI),空胃率の季節変化を検討した。GSIは雌雄ともに11月から増加して2月から4月にかけて著しく低下した。HSIとCFは雌雄ともに7月に最も高く,3月に最も低かった。SCIは5月に高く,11月と3月に低かった。また,空胃率は5月と7月に低く,11月と3月に高かった。以上から,本種成魚の生活年周期は産卵期(2-4月),摂餌盛期・回復期(5-7月),摂餌緩慢期(8-1月)の3期に区分され,さらに摂餌緩慢期は未成熟期(8-10月)と成熟期(11-1月)に分けられた。当海域はマコガレイのほぼ最北の漁場であるが,津軽暖流水の流入により冬季間も温暖なため産卵後活発に摂餌を行い,良好な栄養状態のもとで成熟を開始すると判断された。
Rights: © 2004 日本水産増殖学会
Type: article
URI: http://hdl.handle.net/2115/38493
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: 高橋 豊美

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