Instantaneous separable VPA (ISVPA)

Z. I. Kizner, D. A. Vasilyev

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageEnglish
Pages (from-to)399-411
Number of pages13
JournalICES Journal of Marine Science
Issue number3
StatePublished - Jun 1997


  • Cohort
  • Convergence
  • Instantaneous fishing
  • Minimization
  • Separability
  • VPA


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