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Z. I. Kizner, D. A. Vasilyev, Instantaneous separable VPA (ISVPA), ICES Journal of Marine Science, Volume 54, Issue 3, June 1997, Pages 399–411, https://doi.org/10.1006/jmsc.1996.0188
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Abstract
The approach suggested is in the class of cohort methods; it is a new technique for processing catch-at-age data on species having short (within a year) periods of fishery. The method can also be regarded as an approximation to more general conditions when fishery varies continuously during the year. In many cases it enables a more complete extraction of information on exploited populations and fishery from the catch-at-age matrices, including the natural mortality coefficient and terminal fishing parameters, without using any auxiliary data (survey data, fishing effort series etc.). A number of numerical experiments using simulated data illustrate the methodology and demonstrate the merits of the suggested method.