Estimation of the mixed ratio of native and released ayu <i>Plecoglossus altivelis altivelis</i> caught in the Takatsu River, Shimane Prefecture, Japan
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- TERAKADO HIROYOSHI
- Shimane Prefectural Fisheries Technology Center
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- MURAYAMA TATSURO
- Shimane Prefectural Fisheries Technology Center
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- KANAIWA MINORU
- Department of Aquatic Bioscience, Faculty of Bioindustry, Tokyo University of Agriculture
Bibliographic Information
- Other Title
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- 島根県高津川におけるアユの天然魚と放流魚の混合率の推定
- シマネケン タカツガワ ニ オケル アユ ノ テンネンギョ ト ホウリュウギョ ノ コンゴウリツ ノ スイテイ
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Abstract
<p> Mixed ratios of native and released ayu Plecoglossus altivelis altivelis caught in the Takatsu River were estimated for years 2009 to 2012. The stock of ayu in this river consists of three types: native amphidromous and two released hatchery-reared forms bred at different hatcheries. Mixed ratios were estimated by fitting a multiple normal distribution to the frequency distribution of the scale number above the lateral line using the maximum likelihood method. The data of scale numbers above the lateral line of ayu caught in the upper and lower waters of the dam in this river were resampled by the bootstrap method at 2,000 repetitions, and then each bootstrap distribution was fitted to the multiple normal distribution with two peaks. The native ayu ratios were estimated at 26.3-58.8% and 82.6-100%, respectively. These estimates reflected upstreaming conditions of native ayu, and were considered to be proper values.</p>
Journal
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- NIPPON SUISAN GAKKAISHI
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NIPPON SUISAN GAKKAISHI 82 (6), 911-916, 2016
The Japanese Society of Fisheries Science
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Details 詳細情報について
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- CRID
- 1390001206416992384
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- NII Article ID
- 130005284177
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- NII Book ID
- AN00193422
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- ISSN
- 1349998X
- 00215392
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- NDL BIB ID
- 027777329
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed