神通川と庄川におけるサクラマス親魚の遡上生態
書誌事項
- タイトル別名
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- Upstream Migration and Summer Stay of Adult Masu Salmon in the Jinzu and Shou Rivers of the Hokuriku Region
- ジンツウガワ ト ショウガワ ニ オケル サクラマス オヤザカナ ノ ソジョウ セイタイ
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The upstream migration and the summer stay of adult masu salmon Oncorhynchus masou were investigated in the Jinzu River and the Shou River of the Hokuriku region from 1991 to 1995. The period of upstream migration estimated from the monthly fluctuation of the catch data of masu salmon in the Jinzu River was from February to June, and the peak was in May. The mean fork length of the migrants was 58.5±4.9cm and the mean body weight was 2.8±0.8kg, and the female occupied 74.7% of the total. In the fishing surveys using the drift net in the Shou River, the number of adult masu salmon caught at the pools of the middle reaches occupied 96.4% of total catch. Most of fish (80.2%) caught from the the Jinzu River had empty stomachs. These findings indicate that adult masu salmon migrates to a river and stays in the pools of the middle reaches during summer season, feeding rarely. For effective increase of masu salmon resources, the preservation and/or the reconstruction of larger and deeper pools in a river are very important.
収録刊行物
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- 日本水産学会誌
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日本水産学会誌 66 (1), 44-49, 2000
公益社団法人 日本水産学会
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詳細情報 詳細情報について
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- CRID
- 1390001206414963328
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- NII論文ID
- 110003144957
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- NII書誌ID
- AN00193422
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- ISSN
- 1349998X
- 00215392
- http://id.crossref.org/issn/00215392
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- NDL書誌ID
- 4968009
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可