Some factors affecting the distribution and apparent abundance of yellowfin and skipjack tuna in the Eastern Pacific Ocean

Broadhead, Gordon C. and Barrett, Izadore (1964) Some factors affecting the distribution and apparent abundance of yellowfin and skipjack tuna in the Eastern Pacific Ocean. Inter-American Tropical Tuna Commission Bulletin, 8(8), pp. 417-474.

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Abstract

ENGLISH: Since 1951, the Inter-American Tropical Tuna Commission has been investigating the biology, ecology and population dynamics of the yellowfin tuna, Thunnus albacares, and the skipjack tuna, Katsuwonus pelamis, in the Eastern Pacific Ocean. Of particular importance has been the study of the effects of fishing and of fishery-independent factors on the abundance and distribution of these tunas. For yellowfin tuna there is, on the average, an inverse relationship between total fishing effort and apparent abundance (Schaefer, 1957a). For skipjack there is no evidence to suggest that fishing effort has ever been sufficiently intense to affect measurably the abundance (Schaefer, 1961). Rather, it appears that the year-to-year fluctuations in apparent abundance are independent of the activities of the fishing fleets. SPANISH: Desde 1951 la Comisión Interamericana del Atún Tropical se ha dedicado a la investigación de la biología, ecología y la dinámica de las poblaciones del atún aleta amarilla, Thunnus albacares, y del barrilete, Katsuwonus pelamis, en el Océano Pacífico del Este. De importancia especial ha sido el estudio de los efectos de la pesca y de los factores independientes de las pesquerías sobre la abundancia y la distribución de esos atunes. En cuanto al atún aleta amarilla, existe, en promedio, una relación inversa entre el esfuerzo total de pesca y la abundancia aparente (Schaefer, 1957a) . Con respecto al barrilete, no hay evidencia que haga pensar que el esfuerzo de pesca haya sido nunca lo suficientemente intenso como para afectar sensiblemente la abundancia (Schaefer, 1961). Más bien parece que las fluctuaciones de un año a otro en su abundancia aparente, son independientes de las actividades de las flotas pesqueras.

Item Type: Article
Title: Some factors affecting the distribution and apparent abundance of yellowfin and skipjack tuna in the Eastern Pacific Ocean
Personal Creator/Author:
CreatorsEmail
Broadhead, Gordon C.
Barrett, Izadore
Journal or Publication Title: Inter-American Tropical Tuna Commission Bulletin
Volume: 8
Number: 8
Page Range: pp. 417-474
Date: 1964
Issuing Agency: Inter-American Tropical Tuna Commission
Additional Information: This article is bilingual and contains both Spanish and English translations.
Uncontrolled Keywords: distribution; abundance; yellowfin tuna; Thunnus albacares; skipjack tuna; Katsuwonus pelamis; Eastern Pacific Ocean; distribución; abundancia; atún aleta amarilla; barrilete; Océano Pacífico Oriental
Subjects: Fisheries
Item ID: 2618
Depositing User: Joan Parker
Date Deposited: 24 Sep 2009 12:10
Last Modified: 29 Sep 2011 18:47
URI: http://aquaticcommons.org/id/eprint/2618

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