Document Type

Article

Publication Version

Version of Record

Publication Date

2014

Departmental Paper Identifier

NRM-156

Keywords

Age, growth, marginal increment analysis, otolith, smallmouth bass, walleye

Abstract

Walleye Sander vitreus and smallmouth bass Micropterus dolomieu were sampled monthly (May-October) from Lake Sharpe, South Dakota during 2006 and 2007 to estimate the timing of otolith annulus formation and to evaluate the influence of fish age, sex, and sample location (walleye only) on the timing and detection of annulus formation. Timing of annulus formation was evaluated using marginal increment analysis. Walleye samples were stratified by age, sex, and sample location (i.e., upper and lower Lake Sharpe) and smallmouth bass samples were stratified by age and sex. Monthly mean marginal increment measurements for both species generally increased from May to June, declined in July, and slowly increased from August to October. Although monthly differences in marginal increment measurements across analysis strata were rarely consistent, July generally had the lowest mean marginal increment across species and strata, suggesting that annulus formation in walleye and smallmouth bass in Lake Sharpe likely occurs in July. The lack of differences in timing of annulus formation across species-specific strata was surprising given the well-known influences of age, sex, and water temperature on somatic growth. Nonetheless, results will aid managers in improving the accuracy of age estimates.

Publication Title

The Open Fish Science Journal

Volume

7

First Page

1

Last Page

7

Pages

7

Format

application/pdf

Language

en

DOI of Published Version

10.2174/1874401X01407010001]

Publisher

Bentham Open

Rights

Copyright © 2014 the Authors

Creative Commons License

Creative Commons Attribution 3.0 License
This work is licensed under a Creative Commons Attribution 3.0 License.

Comments

This work was published in The Open Fish Science Journal 7:1-7

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