Schooling habits of yellowfin tuna (Neothunnus macropterus) and skipjack (Katsuwonus pelamis) in the Eastern Pacific Ocean, as indicated by purse seine catch records, 1946-1955

Orange, Craig J. and Schaefer, Milner B. and Larmie, Fred M. (1957) Schooling habits of yellowfin tuna (Neothunnus macropterus) and skipjack (Katsuwonus pelamis) in the Eastern Pacific Ocean, as indicated by purse seine catch records, 1946-1955. Inter-American Tropical Tuna Commission Bulletin, 2(3), pp. 81-127.

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Abstract

ENGLISH: These aspects of the schooling habits of the yellowfin and skipjack tuna may be investigated by means of the logbook records of the catches of individual sets of the nets of purse-seine vessels. For both purposes it must be assumed that a set is made, in each case, on a single school of fish. The study of school sizes based on these data requires the additional assumption either that the entire school is captured or that each set captures a constant fraction of the school upon which it is made. In this paper we report on the results of such investigations based on logbook records of the purse-seine fleet. SPANISH: Estos aspectos de los hábitos gregarios de los atunes aleta amarilla y barrilete pueden ser investigados a base de los registros de bitácora en que se anotan las pescas resultantes de cada una de las operaciones con la red de encierre que realizan los barcos rederos. Para ambos propósitos hay que suponer que las operaciones se efectúan, en cada caso, en un cardumen independiente. El estudio de los tamaños de los cardúmenes o manchas, a base de estos datos, requiere una suposición adicional: que el cardumen entero es capturado o, en su defecto, que en cada operación con la red se pesca una fracción constante de la mancha objeto de la pesca. En el presente artículo damos cuenta de los resultados de dichas investigaciones basadas en los registros de bitácora que lleva la flota de embarcaciones que utilizan redes de encierre. (PDF contains 47 pages.)

Item Type: Article
Title: Schooling habits of yellowfin tuna (Neothunnus macropterus) and skipjack (Katsuwonus pelamis) in the Eastern Pacific Ocean, as indicated by purse seine catch records, 1946-1955
Personal Creator/Author:
CreatorsEmail
Orange, Craig J.
Schaefer, Milner B.
Larmie, Fred M.
Journal or Publication Title: Inter-American Tropical Tuna Commission Bulletin
Volume: 2
Number: 3
Page Range: pp. 81-127
Date: 1957
Issuing Agency: Inter-American Tropical Tuna Commission
Additional Information: This article is bilingual and contains both Spanish and English translations.
Uncontrolled Keywords: Schooling habits; yellowfin tuna; Neothunnus macropterus; skipjack Katsuwonus pelamis; Eastern Pacific Ocean; purse seine; hábitos gregarios; atún aleta amarilla; barrilete; Océano Pacífico Oriental; redes de encierre
Subjects: Fisheries
Item ID: 2628
Depositing User: Joan Parker
Date Deposited: 25 Sep 2009 20:58
Last Modified: 29 Sep 2011 18:48
URI: http://aquaticcommons.org/id/eprint/2628

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