Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model

Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model

 The effect of the fishing effort on the age structure has not been considered in many models. To consider both uncertainty and age structure, a density-dependent matrix model based on a discrete time-form of the logistic equation using the Leslie matrix was employed, with Monte Carlo simul...

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Autores principales: Vaca-Rodríguez, JG, Dreyfus-León, MJ
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2000
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/600
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id oai:cienciasmarinas.com.mx:article-600
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Vaca-Rodríguez, JG
Dreyfus-León, MJ
spellingShingle Vaca-Rodríguez, JG
Dreyfus-León, MJ
Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model
author_facet Vaca-Rodríguez, JG
Dreyfus-León, MJ
author_sort Vaca-Rodríguez, JG
title Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model
title_short Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model
title_full Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model
title_fullStr Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model
title_full_unstemmed Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model
title_sort analysis of the fishing strategies of the yellowfin tuna (thunnus albacares) eastern pacific fishery based on monte carlo simulations of a density-dependent matrix model
description  The effect of the fishing effort on the age structure has not been considered in many models. To consider both uncertainty and age structure, a density-dependent matrix model based on a discrete time-form of the logistic equation using the Leslie matrix was employed, with Monte Carlo simulations. A total of 66 different fishing scenarios were structured for the yellowfin tuna (Thunnus albacares) in the eastern Pacific. The experimental design consisted of 400 ten-year runs for each of the 66 fishing scenarios, considering each age-class. The uncertainty was considered for natural mortality, environmental carrying capacity, total number of sets, catch per set of each type (on dolphins, schools and logs), and recruitment. The age structure had the greatest relative importance in the model, according to sensitivity analysis. One way of controlling the age structure is directing the fishing effort towards the three types of fishing sets. The fishing strategies that presented the highest success probability values (percentage of iterations above arbitrary levels) were those with dominance of dolphin-sets, a small amount of school-sets and almost no log-sets. The best fishing strategies obtain high success probabilities for the especially susceptible age-classes and total biomass. These fishing strategies assure higher total catches, minimum juvenile tuna discards and lower incidental catches. The model predicts a 32% difference in the catches between non-dolphin-sets and dolphin-sets.
publisher Iniversidad Autónoma de Baja California
publishDate 2000
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/600
_version_ 1715723988239384576
spelling oai:cienciasmarinas.com.mx:article-6002019-05-03T20:14:10Z Analysis of the fishing strategies of the yellowfin tuna (Thunnus Albacares) Eastern Pacific Fishery Based on Monte Carlo simulations of a density-dependent matrix model Análisis de las estrategias de pesca del atún aleta amarilla (Thunnus albacares) en el Pacífico oriental basado en simulaciones Monte Carlo de un modelo densodependiente Vaca-Rodríguez, JG Dreyfus-León, MJ fishing strategies Thunnus albacares Leslie Monte Carlo estrategias de pesca Thunnus albacares Leslie Monte Carlo  The effect of the fishing effort on the age structure has not been considered in many models. To consider both uncertainty and age structure, a density-dependent matrix model based on a discrete time-form of the logistic equation using the Leslie matrix was employed, with Monte Carlo simulations. A total of 66 different fishing scenarios were structured for the yellowfin tuna (Thunnus albacares) in the eastern Pacific. The experimental design consisted of 400 ten-year runs for each of the 66 fishing scenarios, considering each age-class. The uncertainty was considered for natural mortality, environmental carrying capacity, total number of sets, catch per set of each type (on dolphins, schools and logs), and recruitment. The age structure had the greatest relative importance in the model, according to sensitivity analysis. One way of controlling the age structure is directing the fishing effort towards the three types of fishing sets. The fishing strategies that presented the highest success probability values (percentage of iterations above arbitrary levels) were those with dominance of dolphin-sets, a small amount of school-sets and almost no log-sets. The best fishing strategies obtain high success probabilities for the especially susceptible age-classes and total biomass. These fishing strategies assure higher total catches, minimum juvenile tuna discards and lower incidental catches. The model predicts a 32% difference in the catches between non-dolphin-sets and dolphin-sets. Muchos planes de manejo de pesquerías tienen aproximaciones determinísticas, sin considerar la incertidumbre en los modelos utilizados. El efecto del esfuerzo pesquero en la estructura de edad tampoco ha sido considerado en muchos modelos. Para considerar tanto la incertidumbre como la estructura de edad, se empleó un modelo matricial densodependiente basado en la forma discreta de la ecuación logística utilizando la matriz de Leslie, con simulaciones Monte Carlo. Se estructuraron 66 diferentes escenarios de explotación para el atún aleta amarilla (Thunnus albacares) en el Pacífico oriental. El diseño experimental consistió en 400 iteraciones de diez años cada una para cada uno de los 66 escenarios de explotación, considerando las clases de edad. La incertidumbre en el modelo se consideró para la mortalidad natural, la capacidad de carga del sistema, la cantidad total de lances, la captura por lance de cada tipo (sobre delfines, brisas y palos), y el reclutamiento. La estructura de edad presentó la mayor importancia relativa en el modelo, de acuerdo con el análisis de sensibilidad. Una de las maneras de controlar la estructura de edad es dirigiendo el esfuerzo pesquero hacia los tres tipos de lances pesqueros. Las estrategias de pesca que presentaron las mayores probabilidades de éxito (porcentaje de iteraciones arriba de un nivel arbitrario) fueron aquellas con dominancia de lances sobre delfines, una pequeña cantidad de lances sobre brisas y una cantidad mínima o nula de lances sobre palos. Las mejores estrategias de pesca obtienen altas probabilidades de éxito para las clases de edad especialmente susceptibles y para la biomasa total. Dichas estrategias de pesca aseguran altas capturas totales, mínimos descartes de atunes juveniles y bajos niveles de captura incidental. El modelo predice una diferencia del 32% en las capturas entre escenarios dominados por lances sobre delfines y los dominados por lances no asociados con delfines. Many fishery management plans have deterministic approaches, without considering uncertainty in the models used. Iniversidad Autónoma de Baja California 2000-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/600 10.7773/cm.v26i3.600 Ciencias Marinas; Vol. 26 No. 3 (2000); 369-391 Ciencias Marinas; Vol. 26 Núm. 3 (2000); 369-391 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/600/536

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