Analysis of age determination methods for yellowtail rockfish, canary rockfish, and black rockfish off Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6m311r83c

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  • Methods and utility of age determination of yellowtail rockfish (Sebastes flavidus), canary rockfish (Sebastes pinniger), and black rockfish (Sebastes melanops) collected off Oregon during 1972 to 1975 are discussed. Structures compared on the basis of the reproducibility of counts of annuli (consistency of readings) were the anal fin pterygiophore, opercle, otolith, scale, and vertebra. The effect of deviations between otolith readings on survival estimates and agelength relationships is presented. Consistency of otolith readings is generally superior to other structures for these three species. For yellowtail, canary, and black rockfish, respectively, 71, 76, and 77% of two independent otolith readings deviated by no more than ±1 assumed annulus. Consistency of otolith readings of all three species decreases with age. Chapman-Robson and catch curve estimates of survival and age-length relationships, derived from two readings of the same otolith, are not significantly different at the 95% level for any of the species.
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