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The develop of jack mackerel stock assessment in Chile

The develop of jack mackerel stock assessment in Chile. Cristian Canales R. Head of Stock Assessment Department Instituto de Fomento Pesquero (IFOP) - Chile. From the data to stock status. Data collecting. Data analysis/indexes. Work hypothesis. Previous knowldge. Modelling and stock

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The develop of jack mackerel stock assessment in Chile

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  1. The develop of jack mackerel stock assessment in Chile Cristian Canales R.Head of Stock Assessment DepartmentInstituto de Fomento Pesquero (IFOP) - Chile

  2. From the data to stock status Data collecting Data analysis/indexes Work hypothesis Previous knowldge Modelling and stock assessment Stock variables Hypothesis test Stock status

  3. Stock Assessment Process Parameters () Biological knowldge Data monitoring/collection Process model/Population dynamic model Ej Nt=Nt-1 *e(-M-Ft-1) Information to be used Observation model Ej. CPUEpred = q*N Error model Ej. d=(CPUEpred – CPUEobs) Joint likelikood function ¿max? no FIN

  4. General modelling approaches employed in Chile In 80s, the Virtual Population Analysis (VPA) methodology started to be used in the main Chilean fisheries This approach respond to necessity of integrate the recorder information under a stock assessment framework 1980-----------------------------------------------2000 ahead VPA family models--------------------------------------------- Bayesian approach Data based ----------------------------------------------------hypothesis based

  5. General modelling approaches employed in Chile

  6. General modelling approaches employed in Chile

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