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Título : | Improving estimates of recruitment and catchability of Jumbo squid Dosidicus gigas in the Gulf of California |
Autor : | Morales Bojorquez, Enrique Hernández Herrera, Agustin Cisneros Mata, M. A. Nevarez Martinez, M. O. |
Palabras clave : | Management catchability depletion model Recruitment Dosidicus gigas outliers squid |
Fecha de publicación : | 2008 |
Editorial : | Journal of Shellfish Research |
Resumen : | We analyzed the effect of outliers of the catch-per-unit effort on the catchability coefficient estimated by using a depletion model. When we used catch-per-unit effort in the Delury model, we observed a curve in the regression of depletion against time. When we then solved the model with a normal probability distribution, the catchability coefficient was poorly estimated. We improved the estimation of catchability using an algorithm that used a two-component-mixture probability distribution. The estimations for catchability (q) and recruitment (N0) were q = 0.41 X 10–3, N0 = 9.13 X 106, and the estimated likelihood was 2.65 X 104 using an algorithm of the normal probability distribution, whereas the estimations made using the algorithm of a two-component-mixture probability distribution were q = 0.23 X 10–3, N0 = 18.07 X 106, and the estimated likelihood was 4.89 X 106. The maximum likelihood estimated with the mixture-distribution algorithm was greater than the maximum likelihood estimated with the normal-distribution algorithm. We believe the two-component-mixture probability distribution fit the data better than the normal probability distribution. From this we determined the consequences on management when overestimations or underestimations of catchability are estimated. |
URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/13309 |
ISSN : | 0730-8000 |
Aparece en las colecciones: | Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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Morales_Bojorquez_Enrique_2008_Journal_of_Shellfish_Research_2296.pdf | 54.93 kB | Adobe PDF | Visualizar/Abrir |
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