Resident fish and support one of the largest and most important 1997).Īmphidromous fish are generally larger and more abundant than Organized by major river basin, which may contain both resi*Corresponding author: Apaccepted May 13, 2013ĭent and sea-run individuals (McCart 1980 Everett et al. Throughout their range, populations are largely West and south through Alaska to the Seward Peninsula (ReistĮt al. Referred to as Dolly Varden, are distributed along the ArcticĬoast of North America from the Mackenzie River in Canada,
Northern-form Dolly Varden Salvelinus malma, hereafter Nonlethally in these cohorts using scales otoliths should be used Because scale and otolith ages exhibited littleīias within cohorts younger than age 6, age may be determined Potential sources of error and management implications are discussed. Underestimation was alsoĪpparent, but less distinct, within fin ray–otolith and scale–fin rayĬomparisons. Agebias plots suggested that, scales consistently underestimated age Significantly different from those for otoliths and fin rays. Furthermore, the CV for scales was intermediate to and not That otoliths produced more precise age determinations than fin Among-reader, within-structure tests of CVs suggested Were used to estimate bias and precision for among-reader, withinstructure comparisons and within-reader, among-structure comparisons. Plots, coefficients of variation (CVs), and percent agreement (PA) To address these gaps, the precision of age determinations generated from scales, otoliths, andįin rays was examined for 126 amphidromous Dolly Varden collected from two Arctic rivers. Otoliths, despite little research investigating the consistency of this Varden Salvelinus malma have been traditionally garnered using The accuracy of population statistics and the validity of management actions they motivate are in part dependent on the acquisition School of Fisheries and Ocean Science, University of Alaska–Fairbanks, 905 North Koyukuk Drive, Post Office Box 757020, Fairbanks, Alaska 99775, USAĭownloaded by at 07:36 19 November 2014 Precision Analysis of Three Aging Structuresįor Amphidromous Dolly Varden from Alaskan Arctic RiversĪlaska Cooperative Fish and Wildlife Research Unit, University of Alaska–Fairbanks, Terms & Conditions of access and use can be found at North American Journal of Fisheries Management 33:732–740, 2013 Reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in anyįorm to anyone is expressly forbidden. This article may be used for research, teaching, and private study purposes. Or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of
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