Estimates of the rates of mortality of yellowfin tuna in the Eastern Pacific Ocean derived from tagging experiments

Bayliff, William H. (1971) Estimates of the rates of mortality of yellowfin tuna in the Eastern Pacific Ocean derived from tagging experiments. Inter-American Tropical Tuna Commission Bulletin, 15(4), pp. 379-436.

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Abstract

ENGLISH: Tag release and return data for the Baja California and Gulf of Guayaquil areas were selected for this study because substantial numbers of returns resulted from these releases and because the effects of emigration are small in these areas. The returns of tags per unit of fishing effort for several experiments in each area were used to estimate the coefficients of total mortality and shedding. The coefficient of annual natural mortality was estimated to be less than 2.0, which is in agreement with a previous estimate of 0.8, but does not improve upon it. The estimates for the average coefficients of catchability are 2.02 X 10-3 for the Baja California area and 0.67 X 10-3 for the Gulf of Guayaquil area. SPANISH: Se seleccionaron para este estudio algunos da tos de liberación y retorno de marcas en las áreas de Baja California y el Golfo de Guayaquil debido a que cantidades substanciales de retornos resultaron de estas liberaciones y porque los efectos de migración son pequeños en estas áreas. Los retornos de marcas por unidad de esfuerzo de pesca de varios experimentos en cada área fueron empleados para estimar los coeficientes de mortalidad total y desprendimiento. Se estimó que el coeficiente de mortalidad natural anual fue inferior a 2.0, lo que está de acuerdo con una estimación anterior de 0.8, pero no la mejora. Las estimaciones de los coeficientes promedios de capturabilidad son 2.02 X 10-3 en el área de Baja California y 0.67 X 10-3 en el área del Golfo de Guayaquil. (PDF contains 58 pages.)

Item Type: Article
Title: Estimates of the rates of mortality of yellowfin tuna in the Eastern Pacific Ocean derived from tagging experiments
Personal Creator/Author:
CreatorsEmail
Bayliff, William H.
Journal or Publication Title: Inter-American Tropical Tuna Commission Bulletin
Volume: 15
Number: 4
Page Range: pp. 379-436
Date: 1971
Issuing Agency: Inter-American Tropical Tuna Commission
Additional Information: This article is bilingual and contains both Spanish and English translations.
Uncontrolled Keywords: mortality rates; yellowfin tuna; Eastern Pacific Ocean; tagging experiments; tasas de mortalidad; atún aleta amarilla; Océano Pacifico Oriental; experimentos de marcación
Subjects: Fisheries
Item ID: 3051
Depositing User: Joan Parker
Date Deposited: 06 Apr 2010 12:28
Last Modified: 29 Sep 2011 17:58
URI: http://aquaticcommons.org/id/eprint/3051

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