Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 7481
Title: Validation of daily increment formation in otoliths from spring Chinook salmon
Author: P. M. Chittaro, Richard W. Zabel, Brian R. Beckman, Donald A. Larsen, Abby E. Tillotson
Publication Year: 2015
Journal: Northwest Science
Volume: 89
Issue: 1
Pages: 93-98
Keywords: otolith,age,daily increments,salmon

Increments of a fish otolith are commonly used to estimate age and somatic growth; yet the accuracy of such estimates first requires an understanding of the periodicity with which increments are formed. We conducted a rearing experiment to evaluate daily formation of increments in otoliths from spring Chinook salmon (Oncorhynchus tshawytscha), an anad- romous fish from the Yakima River, Washington. Specifically, we compared the known number of post-emergence days that fish were alive to the number of otolith increments formed after an emergence check. Our results indicated daily for- mation of otolith increments, thus corroborating previous studies and supporting the use of otolith increments to estimate age and somatic growth of individual Chinook salmon. Given the positive relationship between body size and survival to adulthood, continued use of otolith microstructure to quantify age and growth will help identify factors critical for the recovery of listed Chinook salmon populations. 


Daily tolith increment validation in spring Chiook salmon

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Theme: Recovery and rebuilding of marine and coastal species
Foci: Develop methods to use physiological, biological and behavioral information to predict population-level processes.