Growth and age composition of northern bluefin tuna, Thunnus thynnus, caught in the Eastern Pacific Ocean, as estimated from length-frequency data, with comments on trans-Pacific migrations

Bayliff, William H. (1993) Growth and age composition of northern bluefin tuna, Thunnus thynnus, caught in the Eastern Pacific Ocean, as estimated from length-frequency data, with comments on trans-Pacific migrations. Inter-American Tropical Tuna Commission Bulletin, 20(9), pp. 501-540.

[img]
Preview
PDF (The document's language is [Undefined] .) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (4Mb) | Preview

Abstract

ENGLISH: The spawning of Pacific northern bluefin tuna, Thunnus thynnus, takes place only in the western Pacific Ocean (WPO), but substantial numbers of the juveniles migrate to the eastern Pacific Ocean (EPO), where they remain for several months, or longer, and the.n return to the WPO. Lengthfrequency and tagging data show that many bluefin arrive in the EPO as 1-and 2-year olds, and remain there for one or two fishing seasons before returning to the WPO. The proportion of the fish which make the west-to-east migration varies among years. The numbers of 1-, 2-, 3-, 4, and >4 –year olds in the catches of the EPO are estimated for most years of the 1952-1991 period. SPANISH: EI desove del atun aleta azul del norte del Pacifico, Thunnus thynnus, ocurre solamente en el Océano Pacifico occidental (WPO), pero números substanciales de los juveniles migran al Océano Pacifico oriental (OPO), donde permanecen unos meses, 0 mas, antes de regresar al WPO. Datos de marcado y frecuencia de talla indican que muchos aletas azules llegan al OPO a 1 o 2 anos de edad, y permanecen alIi una 0 dos temporadas de pesca antes de regresar al WPO. La proporcion de los peces que migra del oeste al este varia entre anos. Se estima el numero de peces de 1, 2, 3, 4, Y>4 anos de edad en las capturas del OPO para la mayoria de los anos del periodo de 1952-1991. (PDF contains 40 pages.)

Item Type: Article
Title: Growth and age composition of northern bluefin tuna, Thunnus thynnus, caught in the Eastern Pacific Ocean, as estimated from length-frequency data, with comments on trans-Pacific migrations
Personal Creator/Author:
CreatorsEmail
Bayliff, William H.
Journal or Publication Title: Inter-American Tropical Tuna Commission Bulletin
Volume: 20
Number: 9
Page Range: pp. 501-540
Date: 1993
Issuing Agency: Inter-American Tropical Tuna Commission
Additional Information: This article is bilingual and contains both Spanish and English translations.
Uncontrolled Keywords: growth; age composition; northern bluefin tuna; Thunnus thynnus; Eastern Pacific Ocean; length-frequency data; trans-Pacific migrations; crecimiento; composición; atún aleta azul del norte; Océano Pacifico Oriental; migraciones traspacíficas
Subjects: Fisheries
Item ID: 3523
Depositing User: Joan Parker
Date Deposited: 08 Jun 2010 07:00
Last Modified: 29 Sep 2011 17:15
URI: http://aquaticcommons.org/id/eprint/3523

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...