Standard Weight Equation For Brook Trout In Southern Appalachian Mountains Streams

JOURNAL OF FISH AND WILDLIFE MANAGEMENT(2021)

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摘要
Brook Trout Salvelinus fontinalis in southern Appalachian Mountains streams of the United States occur at the southernmost portion of their native range, and occupy small, isolated, and low-productivity headwater streams. The existing standard weight (W-s) equation is applicable only to Brook Trout > 120 mm total length (TL), but many individuals in the region are smaller than this minimum size threshold due to their habitat characteristics. Here, we developed a new W-s equation for Brook Trout in southern Appalachian Mountains streams using length-weight data on 72,502 individuals. The weighted quadratic empirical-percentile method minimized length-related bias in relative weight compared to the regression-line-percentile and weighted linear empirical-percentile methods. The proposed W-s equation was: log(10)W = -3.364 + 1.378 x log(10)L + 0.397 x (log(10)L)(2), where W was weight (g) and L was TL (mm). The new equation characterized body condition of Brook Trout in southern Appalachian Mountains streams more accurately than the existing equation.
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关键词
Salvelinus fontinalis, fisheries management, relative weight index, body condition, length-weight indices
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