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オホーツク海北部における夏季のニシンの研究. II, 魚群組成の特徴,および魚群の分布と海況との関係について

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Title: オホーツク海北部における夏季のニシンの研究. II, 魚群組成の特徴,および魚群の分布と海況との関係について
Other Titles: Studies on the Ecology of the Herring in the Northern Part of the Okhotsk Sea in Summer. II, On the Characteristics of the Age Composition of the Shoals, and the Relationship between their Distribution and Hydrographic Conditions
Authors: 高橋, 豊美1 Browse this author
Authors(alt): Takahashi, Toyomi1
Issue Date: 1976
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: 42
Issue: 4
Start Page: 427
End Page: 436
Publisher DOI: 10.2331/suisan.42.427
Abstract: In a previous paper, the size and age composition of the shoals and several biological characteristics of the herring, Clupea pallasi, in the northern part of the Okhotsk Sea in the summer of 1971 were reported. In the present study, the author attempted to clarify the features of the age composition of the shoals and the relationship between their distribution and hydrographic conditions on the surface layer. Fish samples and data of oceanographic observation were obtained by the research vessel "Oyashio Maru" in the northern part of the Okhotsk Sea in the summers of 1971-1973. The surface gill nets used were composed of nets of various mesh sizes 30, 35, 42, 48, 55, 63, 72, 82mm, and others, and the results of the analysis of these mesh selection curves suggested that these nets can relatively capture herrings non-selectively. The results obtained are summarized as follows: 1) The shoals were separated into 3 groups according to the type of their age composition; Shoal A was composed of fish older than 4 years old (3+), Shoal B was mainly composed of 2-3 year-old fish, and Shoal C was mainly composed of 4 year-old fish. 2) Shoal B was distributed in comparative warm waters (12-14℃), where the temperature and salinity gradient were small. 3) Shoal C was observed in only remarkably low salinity areas (27.1-31.2‰), where the discharges of rivers could have some influence. 4) There is a possibility that the extension of the low salinity waters helped to define the distribution of Shoal A. 5) It is deduced that each shoal generally separates from one another geographically due to the distribution of Shoal B and Shoal C in connection with peculiar water masses, respectively.
1971~1973年の8~9月にオホーツク海北部で行なわれたさけ・ます幼魚採集用の表層流網に混獲されたニシンの標本,および海洋観測結果に基づき,当海域における夏季ニシンの群組成の特徴,および魚群の分布と海況との関係について検討した。1) 夏季のニシン群は年令構成の特徴からみて,4才以上の年令魚で構成されている中・高令魚群,2~3才の若令魚主体群,および4才魚主体群の以上,3つの魚群集団に分けられる。これらの各群は一般に地理的な分離を示す。2) 若令魚主体群は表層が温暖(12~14℃)で,水温・塩分の傾度が小さい安定した海洋環境の中に分布する。3) 4才魚主体群は水温との対応性は認められないが,Amure河などの河川水の流入域となつている表層低鹹域(27.2~31.2‰)でのみ漁獲が認められた。4) 中・高令魚群については低鹹な水帯が分布障壁となつている可能性があるものと考えられた。5) 年令構成の異なる各々の魚群集団が一般に地理的分離を示すのは,それぞれ特有の水塊と対応しているためと推察され,特にB群とC群との関係はそれをよく反映している。
Rights: © 1976 公益社団法人日本水産学会
© 1976 The Japanese Society of Fisheries Science
Type: article
URI: http://hdl.handle.net/2115/38566
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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