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Age-specific patterns in density-dependent growth of white crappie, Pomoxis annularis

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Abstract:

Abstract

The relationship between growth in white crappie, Pomoxis annularis Rafinesque, and climate, lake morphometry and population density was studied in 103 Texas reservoirs. Growth of age-0 through age-3 white crappie was significantly (P≤0.05) related to latitude, growing season and surface area. Growth of age-1 through age-5 white crappie also was related to annual precipitation. Multiple linear regression models with precipitation and mean catch per unit effort (CPUE) of white crappie as independent variables explained 14–22% of the variation in growth of age-0, -1 and -2 white crappie. By contrast, growth of age-3, -4 and -5 white crappie was unrelated to CPUE. Apparently, between age 2 and 3, the density of white crappie in Texas reservoirs falls below a density-dependent growth threshold beyond which growth is no longer related to density. This density-dependent threshold was most likely related to angler harvest of larger, older white crappie.

Keywords: Pomoxis annularis; angling; length; population dynamics

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1365-2400.2004.00360.x

Publication date: February 1, 2004

bsc/fme/2004/00000011/00000001/art00004
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