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Biology of the Sand Roller in the Central Columbia River
Author(s) -
Gray Robert H.,
Dauble Dennis D.
Publication year - 1979
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1979)108<646:botsri>2.0.co;2
Subject(s) - tributary , biology , fish measurement , zooplankton , larva , fish <actinopterygii> , fishery , aquatic insect , crustacean , ecology , geography , cartography
The sand roller, Percopsis transmontana, is endemic to the Columbia River and its tributaries. The species occurs at depths to 4 m over rock and sand bottom at temperatures of 2.5 C in winter to 20.5 C in summer. The fork length (FL, mm)‐weight (W, g) relationship of the sand roller is log e W = 10.65 + 2.91 log e FL. Sand rollers attain at least age VI and 103 mm FL. Fish growth is greatest during the first year of life and declines after maturity at age II‐III. Spawning occurs in midsummer. Aquatic insect larvae (mainly Diptera and Trichoptera) are the major food items, but crustacean zooplankton constitute a greater portion of the diet of immature fish less than 40 mm FL.