Comparison between Hatchery-reared Ayu and Wild Ayu for Upstreaming through a Fishway in the Gokase River.
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- HIRANO Katsumi
- 宮崎大学農学部
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- IWATSUKI Yukio
- 宮崎大学農学部
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- YASUMOTO Jyunichi
- 延岡市役所
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- ODA Shigeyuki
- 宮崎大学農学部
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- MIMURA Fumitaka
- 宮崎大学農学部
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- YAGI Masao
- 宮崎大学農学部
Bibliographic Information
- Other Title
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- 放流種苗の違いによる遡上数の比較
- ホウリュウ シュビョウ ノ チガイ ニヨル ソジョウスウ ノ ヒカク
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Description
A comparsion of the numbers of three kinds of Ayu, Plecoglossus altivelis going upstream through the central fishway of Iwakuma weir in the Gokase River was made during 3 years. Fry bred in the Lake Biwa (A), sea-captured ones (B) and artificially hatched ones (C) were marked with ribbon tags of different colors and released into the downstream of the fishway. The upstreaming rates on the fishway were 1.44% for group C, 2.39-6.29 for group A and 3.96-9.65% for group B. The fry of group A and B mostly went upstream within 10 days after release, whereas many fry in group C swam up even after 20 days post release. The day on which most tagged fry swam up was consistent with the best upstreaming season for ayu.
Journal
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- Aquaculture Science
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Aquaculture Science 44 (2), 147-150, 1996
Japanese Society for Aquaculture Science
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Details 詳細情報について
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- CRID
- 1390282679691800832
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- NII Article ID
- 10004770464
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- NII Book ID
- AN00124667
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- ISSN
- 21850194
- 03714217
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- NDL BIB ID
- 3976898
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed