Contribution to the catch and reproduction of hatchery-reared ayu Plecoglossus altivelis altivelis in the upper reaches of Kagami Dam Lake in the Kagami River, Kochi Prefecture

被引：0

作者：

Urabe, Atsushi ^{[1
,3
]}

Nagaiwa, Riou ^{[1
,4
]}

Sumikawa, Kazu ^{[1
]}

Tsuyuki, Atsushi ^{[2
,5
]}

Umino, Tetsuya ^{[2
]}

机构：

[1] Kochi Prefectural Freshwater Fisheries Ctr, Kochi 7820016, Japan

[2] Hiroshima Univ, Grad Sch Biosphere Sci, Higashihiroshima, Hiroshima 7398528, Japan

[3] Kochi Prefectural Govt, Fisheries Promot Dept, Fisheries Management Div, Kochi 7800850, Japan

[4] Kochi Prefectural Govt, Fisheries Promot Dept, Fisheries Promot Div, Kochi 7800850, Japan

[5] Okayama Prefectural Technol Ctr Agr Forestry Fishe, Res Inst Fisheries Sci, Setouchi, Okayama 7014303, Japan

来源：

NIPPON SUISAN GAKKAISHI | 2025年 / 91卷 / 02期

关键词：

PROGRAMS;

D O I：

10.2331/suisan.24-00028

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

We investigated the strain identification between hatchery-reared and landlocked ayu Plecoglossus altivelis altivelis using meristic character (number of scales above the lateral line based on the dorsal fin ray) and otolith Sr:Ca ratios in the upper reaches of Kagami Dam Lake in the Kagami River. The percentages of landlocked and hatchery ayu in angling (tomozuri) caught fish in May-September in 2017 were 17-92% and 8-83%, respectively. Using microsatellite DNA markers, we examined the reproduction of landlocked and hatchery ayu in Kagami Dam Lake. The genetic origin of parent and upstream migrated populations in the landlocked form in Kagami Dam Lake was identified as hybrid fish between amphidromous and Lake Biwa strains using assignment tests. Moreover, among the spawning in November and December, 23-27% of individuals were identified as amphidromous strain, suggesting that hatchery-reared ayu contributed to the reproduction. These results indicated the contribution of hatchery-reared ayu to the reproduction and enhancement of resources in Kagami Dam Lake and its upper reaches. However, most individuals within the upstream migrated population were identified as hybrid fish. This indicates that most of the ayu in Kagami Dam Lake are hybrid fish, and their reproduction contributes to the persistence of the population.

引用

页码：73 / 83

页数：11