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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References
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Acknowledgments
This research was funded in part by the Internal Grant Program at the Northwest Fisheries Science Center. The University of Washington School of Aquatic and Fishery Sciences (UW-SAFS) and Friday Harbor Laboratories provided funding and facilities for field work. A.H.B. was supported by the National Science Foundation, ARCS Foundation, and UW-SAFS. We thank the many volunteers involved in the collection of lingcod, especially A. Dufault and C. Sergeant. We thank K. Cooper and J. Dickey (UW-SAFS) for conducting the hormone assays. Thanks to three anonymous reviewers for providing valuable comments on a draft of the manuscript. The research complies with all applicable United States laws, and the authors declare that they have no conflicts of interest.
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Beaudreau, A.H., Andrews, K.S., Larsen, D.A. et al. Variation in plasma levels of insulin-like growth factor-I (IGF-I) in lingcod: relationships among season, size, and gonadal steroids. Mar Biol 158, 439–450 (2011). https://doi.org/10.1007/s00227-010-1571-9
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DOI: https://doi.org/10.1007/s00227-010-1571-9