Dispersal of wild and domestic masu salmon fry (Oncorhynchus masou) in an artificial channel

M. Nagata, M. Nakajima, M. Fujiwara

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The day and night pattern of upstream and downstream dispersal of masu salmon fry of wild and domestic origin was compared in artificial channels (45 m long), for two ages of planting: unfed alevins and eyed eggs. Early dispersal was important for the wild stock (48–50%) compared with the domestic one (16–36%). More wild fry moved downstream than upstream, and more domestic fry dispersed upstream. Upstream movement in wild and domestic fry was more active by day than by night, except for wild fry planted as eyed eggs, where upstream migration was higher at night. In contrast, downstream movement in wild and domestic fry was more common by night than by day, but daylight catches were not negligible for the wild stock.

Original languageEnglish
Pages (from-to)99-109
Number of pages11
JournalJournal of Fish Biology
Volume45
Issue number1
DOIs
Publication statusPublished - 1994 Jul
Externally publishedYes

Keywords

  • dispersal
  • domestic
  • masu salmon
  • newly emerged fry
  • wild

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

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