Variation in plasma levels of insulin-like growth factor-I (IGF-I) in lingcod: relationships among season,size, and gonadal steroids |
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Authors: | Anne H Beaudreau Kelly S Andrews Donald A Larsen Graham Young Brian R Beckman |
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Institution: | (1) School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, WA 98195, USA;(2) NOAA Fisheries, Northwest Fisheries Science Center, 2725 Montlake Blvd E., Seattle, WA 98112, USA;(3) Center for Reproductive Biology, Washington State University, Pullman, WA 99164, USA |
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Abstract: | The physiological response of a fish to its environment is mediated through the endocrine axis controlling growth. Therefore,
growth-regulating hormone levels can serve as ecologically relevant indicators of fish growth rate. We quantified variation
in plasma insulin-like growth factor-I (IGF-I) to evaluate its potential as an indicator of growth in lingcod, an economically
and ecologically important bottomfish species in the northeast Pacific. An information-theoretic model selection approach
was used to test the hypothesis that variation in lingcod IGF-I is related to season, body size, and gonadal steroid concentration.
Season and a length × season interaction were the most important predictors of plasma IGF-I among the variables we evaluated,
suggesting that season and body size should be explicitly accounted for when interpreting endocrine patterns in wild fish
populations. This is among the few studies that have measured and interpreted patterns of IGF-I in wild fish and the first
to describe seasonal endocrine profiles in lingcod. |
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