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ALADYM: an age and length-based single species simulator for exploring alternative management strategies

Published online by Cambridge University Press:  17 June 2009

Giuseppe Lembo ,
Alvaro Abella ,
Fabio Fiorentino ,
Sergio Martino  and
Maria-Teresa Spedicato
Giuseppe Lembo
Affiliation:
COISPA Tecnologia & Ricerca, Via dei trulli 18-20, 70126 Bari, Italy
Alvaro Abella
Affiliation:
ARPAT-AREA MARE, Via Marradi 114, Livorno, Italy
Fabio Fiorentino
Affiliation:
IAMC-CNR, Via L. Vaccara 61, Mazara del Vallo (TP), Italy
Sergio Martino
Affiliation:
COISPA Tecnologia & Ricerca, Via dei trulli 18-20, 70126 Bari, Italy
Maria-Teresa Spedicato
Affiliation:
COISPA Tecnologia & Ricerca, Via dei trulli 18-20, 70126 Bari, Italy
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Abstract

ALADYM (age-length based dynamic model) is an age-length based simulation model designed to predict the consequences of management scenarios on a single population, in terms of different metrics and indicators. Removals are simulated as total mortality modulated using a selectivity pattern and a fishing activity coefficient. ALADYM uses the classical equations of population dynamics to create a tool that uses fishery-independent information (e.g. from trawl surveys) as the primary source. The formulation of population dynamics at a small time scale (month) allows to model the effects of harvest controls that evolve through the year, which is particularly useful for fast growing species. The possibility of specifying a vector of natural mortality by age/length makes the model more suitable for situations where stocks are exploited at an early life stage, as in many Mediterranean fisheries, while introducing variations along the time of the harvesting pattern accounts for non-equilibrium situations. Stochastic effects can be added to some key life-history traits to incorporate uncertainty in input parameters and in their relationships. ALADYM can be used for a range of applications such as comparing management strategies, evaluating indicator changes or searching for reference points.

Keywords

Fish population dynamicsSimulation modelFishery-independent approachFishery management
Type
Research Article
Information
Aquatic Living Resources , Volume 22 , Issue 2: Fish Stock Assessments Using Surveys and Indicators , April 2009 , pp. 233 - 241
Copyright
© EDP Sciences, IFREMER, IRD, 2009

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