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Scheda modello

APRI: Statistical analysis of fish populations

The program allows the parameter estimation and simulation of natural population under explotation, under the assuption that the recruitment is relatively constant. This is the case, for instance, of population migrating from their native environment and being exploited in a different area.
APRI has been mainly developed for fish populations.

Two models can be developed: an age-structured model, in case data of the fishing effort are available for a series of years and, at least in one year, data on catchment and selectivity for each age class have been collected; or an age-independent model, when only the effort and the total catchment are available in a series of years. Both models allows the estimation of survival rates, catchability coefficients and recruitment.


area: dynamics of natural ecosystems
objectives: modelling, parameter estimation
description: population dynamics/demography, exploitation, age-structured populations, fishes, recruitment


The program is available at:
Citta' Studi scrl
Piazza Leonardo da Vinci, 7
20133 Milano
Tel. 02-2361583
Fax. 02-2367642


Prof. M. Gatto
Dipartimento di Elettronica ed Informazione
Politecnico di Milano
Via Ponzio 34/5
20133 Milano


  • Marino Gatto "APRI, manuale d'uso". CLUP, Milano.



Estratto dalla banca modelli del progetto CEE GAIA INCO - www.ess.co.at/GAIA