魚類学雑誌
Online ISSN : 1884-7374
Print ISSN : 0021-5090
ISSN-L : 0021-5090
淀川大堰湛水域における琵琶湖産アユの河川残留個体の存在
瀬口 雄一山本 義彦竹門 康弘源 利文
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ジャーナル 認証あり 早期公開

論文ID: 20-038

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A population of freshwater Ayu (Plecoglossus altivelis altivelis) was found in the “wandos”, semi-enclosed remnants of artificial pond-like structures along the Yodo River at Shirokita, upstream of the Yodo River barrage. Microsatellite analysis of collected individuals showed their genetic origin to be a Lake Biwa strain, with a hatching date between September and November, estimated by otolith analysis. Otolith strontium and calcium concentrations indicated no history of seaward migration, the individuals analyzed having inhabited freshwater since hatching. In addition, eDNA analysis suggested that they had migrated from the main river course into the “wandos” in November.

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© 2021 The Ichthyological Society of Japan
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