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Proceedings of the research workshop on the rapid estimation of fish age using Fourier Transform Near Infrared Spectroscopy (FT-NIRS)
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2019
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Series: AFSC processed report ; 2019-06
[PDF-3.50 MB]
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Description:Fish ages are a fundamental data element of integrated stock assessments because they provide information on recruitment, growth, maturity, and production (Maunder and Punt 2013, Ono et al. 2015). Estimation of age composition, size at age, maturity at age and longevity of a fish population is critical for assessing the overfishing or overfished status of a stock (Ricker 1975, Hilborn and Walters 1992, Campana and Thorrold 2001, Ono et al. 2015). Fish age has historically been determined by microscopically counting pairs of annual opaque and translucent growth zones in a number of different hard structures including scales, vertebrae, opercula, spines, and most commonly otoliths (Bagenal and Tesch 1978, Chilton and Beamish 1982). In federally managed waters of the United States, over 1.1 M hard structures (minimum estimate) have been examined for age estimates during the period from 2008 to 2015 (T. Helser, AFSC, personal c ommunication) and most management regions have shown a steady increase in the number of otoliths aged per year.
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Rights Information:Public Domain
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