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Irregularly shaped otoliths from saugers prevent back-calculation of length at previous ages in Wyoming

North American Journal of Fisheries Management

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Abstract

We collected otoliths from saugers Stizostedion canadense in Boysen Reservoir, Bighorn Reservoir, and the Bighorn River in Wyoming to evaluate age and growth. All otoliths in our samples (264 fish) were irregularly shaped, and the irregularities became more pronounced with increasing age of the fish. Age estimates with irregular otoliths were possible, but back-calculation of length at previous ages was not possible as a result of radically inconsistent lengths of radii. It should not be assumed that otoliths can be used for back calculation of length at age among all stocks of sauger. The assumption of regular otolith formation within a stock should be tested before obtaining samples of otoliths for age and growth assessment.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Irregularly shaped otoliths from saugers prevent back-calculation of length at previous ages in Wyoming
Series title:
North American Journal of Fisheries Management
Volume
17
Issue:
3
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
North American Journal of Fisheries Management
First page:
769
Last page:
772
Number of Pages:
4