Synopsis
Growth patterns of the 1982 year-class, individual growth patterns, age at sexual maturity and longevity in the river-sculpin, Cottus hangiongensis (Cottidae), were investigated along the course of the Daitobetsu River of southern Hokkaido, Japan. Slow growth occurred in males from the lower reaches, while more rapid growth was found in males from upstream areas. Age at first sexual maturity in males generally increased from 2 or 3 years in downstream areas to 4–6 years in upstream sites. Longevity was estimated as 7 years throughout the river course except in the uppermost site where it was 6 years. The growth differences evident in male C. hangiongensis are likely a result of differences in sculpin population density and/or food abundance along the river course, and are apparently reflected in variation in their life-history as well.
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Goto, A. Growth differences in males of the river-sculpin Cottus hangiongensis along a river course, a correlate of life-history variation. Environ Biol Fish 24, 241–249 (1989). https://doi.org/10.1007/BF00001398
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DOI: https://doi.org/10.1007/BF00001398