Atypical swimbladders of lake charr, Salvelinus ...

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Paper title Atypical swimbladders of lake charr, Salvelinus namaycush, from Great Slave Lake, Northwest Territories, Canada
Paper author(s) Randy L. Eshenroder, E. Don Stevens, Mara S. Zimmerman, Charles C. Krueger
Proceedings title Environmental Biology of Fishes; International Charr Symposium 2006
Date 2008
Abstract Swimbladder walls of lake charr, Salvelinus namaycush, from Great Slave Lake (GSL), Northwest Territories, Canada, were unusually thick for the species. The thinnest sections of the GSL bladders (mean = 2.44mm, range = 1.1-4.4mm) were significantly thicker (P = 0.001) than lake charr swimbladders collected from two small Province of Ontario lakes (means = 0.65 and 0.92mm), whose populations were assumed to be representative of the species. Variance in wall thickness was also greater in GSL lake charr than in charr from two small lakes (P < 0.02). Within individuals, some of the GSL bladder walls were markedly irregular in thickness, but whether these anomalies exist in situ or were artifacts of preservation remains uncertain. The bulk of the tissue in the thickest sections of the GSL swimbladders was in the tunica serosa (outer layer). The extent of the modification of the GSL swimbladders is extraordinary for northern fishes in postglacial lakes.

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