Upstream migratory history in juvenile stage of yellowfin goby <i>Acanthogobius flavimanus</i> in Tokyo Bay as revealed by otolith Sr:Ca ratios

MATSUZAKI KEISUKE, KANOU KOUKI, KOHNO HIROSHI

doi:10.2331/suisan.80.928

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Other Title

耳石微量元素分析によって明らかにされた東京湾産マハゼの稚魚期での河川遡上履歴
ジセキビリョウゲンソブンセキニヨッテアキラカニサレタトウキョウワンサンマハゼノチギョキデノカセンソジョウリレキ
Upstream migratory history in juvenile stage of yellowfin goby Acanthogobius flavimanus in Tokyo Bay as revealed by otolith Sr:Ca ratios

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The migratory history of yellowfin goby Acanthogobius flavimanus collected from brackish and fresh waters in Tokyo Bay and its adjacent rivers, central Japan was examined using otolith Sr:Ca ratios of 61 specimens (52.4-131.8 mm in standard length, SL). All the 21 yellowfin gobies collected from the fresh waters had higher Sr:Ca ratios (3.0-7.5×10⁻³) at the central otolith area, suggesting their origin was estuarine or marine areas, and the ratios decreased rapidly to 2.5×10⁻³ and lower toward the otolith edge, indicating their upstream migration to fresh waters in the juvenile stage. Of 40 specimens collected from brackish waters, 31 specimens were determined not to have experience of upstream migration and eight specimens to have temporarily entered or to have been momentarily exposed to fresh waters. The remaining one specimen of 96.5 mm SL had higher Sr:Ca ratios at the otolith center and edge portions and lower ratios at the middle portion, indicating that this specimen had experience of upstream and downstream migrations. The present study suggests that the yellowfin goby has flexible migration patterns, allowing it to utilize the full range of salinity during its life history.<br>

Journal

NIPPON SUISAN GAKKAISHI

NIPPON SUISAN GAKKAISHI 80 (6), 928-933, 2014

The Japanese Society of Fisheries Science

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