山形県月光川において異なる時期に 放流したサケ Oncorhynchus keta の 回帰率比較

Translated title of the contribution: Comparison of return rates of chum salmon Oncorhynchus keta released at various times into the Gakko River, Yamagata Prefecture, Japan

Masaya Iida, Masaya Iida, Masatoshi Ban, Daigo Noguchi, Yasuyuki Miyauchi, Satoshi Katayama

Research output: Contribution to journalArticle

Abstract

To determine the optimal time for releasing chum salmon into the Gakko River, otolith-marked juveniles reared to more than 1 g body mass were released in late February, mid-March, and late March of 2009 to 2011. Although factors that determine return rates are yet unknown, the return rates were highest for the mid-March (0.62ô-1.02ô) groups of all three brood years. Return rates for the late February and late March groups were approximately half that of the mid-March groups. These results suggest that releasing chum salmon in mid-March is optimal for increasing return rates.

Translated title of the contributionComparison of return rates of chum salmon Oncorhynchus keta released at various times into the Gakko River, Yamagata Prefecture, Japan
Original languageJapanese
Pages (from-to)137-140
Number of pages4
JournalAquaculture Science
Volume66
Issue number2
DOIs
Publication statusPublished - 2018

ASJC Scopus subject areas

  • Aquatic Science
  • Animal Science and Zoology

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