Validation of age determination from Otoliths for Bay of Biscay anchovy
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AuthorsUriarte, A. (Andrés); Rico, I. (Iñaki); Villamor, B. (Begoña); Duhamel, E. (Erwan); Dueñas-Liaño, C. (Clara); Aldanondo, N.(Naroa); Cotano, U. (Unai)
Comprehension of the annual pattern of annulus formation throughout the anchovy life span was first achieved from the observations of the strong 1982 year class which showed a neat annual progression of modal lengths passing through the fishery until the exceptional age of 5. Validation of the proposed method was subsequently obtained through monitoring of the progression of the strong 1987, 1989 and 1991 year-classes, both by spring annual surveys and by continuous sampling of the commercial catches, coupled to the monitoring of the seasonal marginal edge formation of the otoliths. Since then Age validation has been confirmed by the correlation between the pulses of recruitments (at age 1), as reflected in their relative occurrence in the population in Spring, and the abundance of those recruitments according to surveys. Typically, annual growth of anchovy otoliths of the one and two years old diminish to about 2/3-1/2 and 1/3 of that occurring in their previous ages respectively. ...
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