Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico

In this paper a depletion model with two different approaches (stochastic and deterministic) was analyzed, in order to compare the observation error hypothesis in the catch-per-unit effort (CPUE) data, and the process error in the model, as well as its effect on the recruitment and catchability esti...

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Main Authors: Morales-Bojórquez, E, Nevárez-Martínez, MO
Format: Online
Language:eng
Published: Iniversidad Autónoma de Baja California 2002
Online Access:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/214
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spelling oai:cienciasmarinas.com.mx:article-2142019-05-02T17:29:43Z Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico Estimación estocástica de la capturabilidad y el reclutamiento del calamar gigante Dosidicus gigas (D’Orbigny, 1835) del Golfo de California, México Morales-Bojórquez, E Nevárez-Martínez, MO process error observation error Monte Carlo simulation risk error de proceso error de observación simulación Monte Carlo riesgo In this paper a depletion model with two different approaches (stochastic and deterministic) was analyzed, in order to compare the observation error hypothesis in the catch-per-unit effort (CPUE) data, and the process error in the model, as well as its effect on the recruitment and catchability estimates in the jumbo squid fishery from the Gulf of California, Mexico. Results showed an underestimation of the catchability (q) when the deterministic aproach was used. The observation error showed a bias in q (+31%) higher than in recruitment (+8%), while a Monte Carlo simulation estimated a negative bias for q, and a positive bias in recruitment. The computation of the expected value of catchability ( E(ˆqCPUE/Ci)) was 2.8 × 10–4, while the confidence intervals with the deterministic model were 3.3 × 10–4 < q < 4.1 × 10–4, showing that the estimate of E(ˆqCPUE/Ci) was not within these confidence intervals.  E(ˆqCPUE/Ci) fitted the model to the data, describing the trend of the CPUE index in time, and its implications in the management of the jumbo squid fishery. En este trabajo se analizó el desempeño de un modelo de extracción sucesiva con dos diferentes enfoques (determinístico y estocástico), para comparar las hipótesis de error de observación en los datos de captura por unidad de esfuerzo (CPUE), y el error de proceso en el modelo, así como su efecto sobre las estimaciones de reclutamiento y capturabilidad en la pesquería de calamar gigante del Golfo de California, México. Los resultados mostraron una subestimación de la capturabilidad (q) con el enfoque determinístico. El error de observación mostró un sesgo en q (+31%) más grande que en el reclutamiento (+8%), mientras que la simulación Monte Carlo estimó un sesgo negativo para q y sesgo positivo en el reclutamiento. El cálculo del valor esperado de la capturabilidad (E(ˆqCPUE/Ci)) fue de 2.8 × 10–4, mientras que los intervalos de confianza con el modelo determinístico fueron 3.3 × 10–4 < q < 4.1 × 10–4, mostrando que la estimación de  E(ˆqCPUE/Ci) no se encontraba dentro de estos intervalos de confianza.  E(ˆqCPUE/Ci) ajustó el modelo a los datos, describiendo la tendencia del índice de CPUE a través del tiempo, y sus implicaciones en el manejo de la pesquería de calamar gigante. Iniversidad Autónoma de Baja California 2002-03-06 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/214 10.7773/cm.v28i2.214 Ciencias Marinas; Vol. 28 No. 2 (2002); 193-204 Ciencias Marinas; Vol. 28 Núm. 2 (2002); 193-204 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/214/181
institution Ciencias Marinas
collection OJS
language eng
format Online
author Morales-Bojórquez, E
Nevárez-Martínez, MO
spellingShingle Morales-Bojórquez, E
Nevárez-Martínez, MO
Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico
author_facet Morales-Bojórquez, E
Nevárez-Martínez, MO
author_sort Morales-Bojórquez, E
title Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico
title_short Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico
title_full Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico
title_fullStr Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico
title_full_unstemmed Stochastic estimation of the catchability and recruitment of the jumbo squid Dosidicus gigas (D'Orbigny, 1835) Of The Gulf Of California, Mexico
title_sort stochastic estimation of the catchability and recruitment of the jumbo squid dosidicus gigas (d'orbigny, 1835) of the gulf of california, mexico
description In this paper a depletion model with two different approaches (stochastic and deterministic) was analyzed, in order to compare the observation error hypothesis in the catch-per-unit effort (CPUE) data, and the process error in the model, as well as its effect on the recruitment and catchability estimates in the jumbo squid fishery from the Gulf of California, Mexico. Results showed an underestimation of the catchability (q) when the deterministic aproach was used. The observation error showed a bias in q (+31%) higher than in recruitment (+8%), while a Monte Carlo simulation estimated a negative bias for q, and a positive bias in recruitment. The computation of the expected value of catchability ( E(ˆqCPUE/Ci)) was 2.8 × 10–4, while the confidence intervals with the deterministic model were 3.3 × 10–4 < q < 4.1 × 10–4, showing that the estimate of E(ˆqCPUE/Ci) was not within these confidence intervals.  E(ˆqCPUE/Ci) fitted the model to the data, describing the trend of the CPUE index in time, and its implications in the management of the jumbo squid fishery.
publisher Iniversidad Autónoma de Baja California
publishDate 2002
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/214
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