Catch rates as indices of abundance of yellowfin tuna, Thunnus albacares, in the Eastern Pacific Ocean

Allen, Robin and Punsly, Richard G. (1984) Catch rates as indices of abundance of yellowfin tuna, Thunnus albacares, in the Eastern Pacific Ocean. Inter-American Tropical Tuna Commission Bulletin, 18(4), pp. 301-379.

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Abstract

ENGLISH: Catch and effort data from logbooks of tuna seiners were used to make estimates of catch per hour of searching for 1970-1980. The estimates were standardized using a regression model to make annual estimates of abundance adjusted for fishing mode, speed, capacity, use of aerial assistance, net dimensions, and sea-surface temperature. Inside the CYRA the standardized estimates for tuna schools associated with dolphins and those for schools not associated with dolphins showed a similar overall pattern of decline. The 1980 catch rates were about 300/0 of the 1970 rates, the decline being greater for the schools not associated with dolphins. Dolphin-associated schools outside the CYRA declined to about 60% of the 1970 levels. SPANISH: Se emplearon los datos de la captura y el esfuerzo de los cuadernos de bitácora de las embarcaciones cerqueras para hacer las estimaciones de la captura por hora de búsqueda correspondientes a 1970-1980. Se normalizaron estas estimaciones usando un modelo de regresión con el fin' de hacer las estimaciones anuales de la abundancia, ajustadas según la moda de pesca, velocidad, capacidad, uso de ayuda aérea, dimensiones de la red y temperatura de la superficie del mar. En el ARCAA las estimaciones normalizadas de los cardúmenes de atún asociados con delfines y aquellas de los cardúmenes no asociados con delfines, indicaron una pauta general similar de reducción. Las proporciones de captura de 1980, fueron cerca del 300/0 de las de 1970, encontrándose la mayor reducción en los cardúmenes no asociados con delfines. Los cardúmenes asociados con delfines, fuera del ARCAA, se redujeron en un 60% con respecto a los niveles de 1970. (PDF contains 79 pages.)

Item Type: Article
Title: Catch rates as indices of abundance of yellowfin tuna, Thunnus albacares, in the Eastern Pacific Ocean
Personal Creator/Author:
CreatorsEmail
Allen, Robin
Punsly, Richard G.
Journal or Publication Title: Inter-American Tropical Tuna Commission Bulletin
Volume: 18
Number: 4
Page Range: pp. 301-379
Date: 1984
Issuing Agency: Inter-American Tropical Tuna Commission
Additional Information: This article is bilingual and contains both English and Spanish translations.
Uncontrolled Keywords: catch rates; abundance; yellowfin tuna; Thunnus albacares; Eastern Pacific Ocean; abundancia; atún aleta amarilla; Thunnus albacares; Océano Pacifico Oriental
Subjects: Fisheries
Item ID: 3386
Depositing User: Joan Parker
Date Deposited: 18 May 2010 12:39
Last Modified: 29 Sep 2011 17:29
URI: http://aquaticcommons.org/id/eprint/3386

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