Importance of instream cover for young masu salmon, Oncorhynchus masou , in autumn and winter
2002; Wiley; Volume: 9; Issue: 4 Linguagem: Inglês
10.1046/j.1365-2400.2002.00300.x
ISSN1365-2400
AutoresYasuyuki Miyakoshi, Hirofumi Hayano, Hajime Omori, Mitsuhiro Nagata, James R. Irvine,
Tópico(s)Marine and fisheries research
ResumoDensities of wild masu salmon, Oncorhynchus masou Brevoort, were investigated before (late‐September) and after (mid‐November) autumnal habitat shifts in a small river in Hokkaido, northern Japan. Abundance of instream cover habitat formed by coarse woody debris, submerged vegetation and undercut banks was quantified. Density of 1+ and older masu salmon was significantly correlated with cover abundance in autumn, although cover was not significant for density of 0+ fish, indicating that clear‐cut reaches were utilized by 0+ masu salmon in autumn. In early winter, densities of 0+ and 1+ and older masu salmon were both correlated with cover availability. These results suggest that the amount of cover habitat is an important regulator for densities of juvenile masu salmon during winter.
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