Size composition, growth and sexual maturity of bigeye tuna, Thunnus obesus (Lowe), from the Japanese long-line fishery in the Eastern Pacific Ocean

Kume, Susumu and Joseph, James (1966) Size composition, growth and sexual maturity of bigeye tuna, Thunnus obesus (Lowe), from the Japanese long-line fishery in the Eastern Pacific Ocean. Inter-American Tropical Tuna Commission Bulletin, 11(2), pp. 45-100.

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Abstract

Size composition data of bigeye tuna taken from the eastern tropical Pacific Ocean by Japanese Prefectural experimental training vessels from 1958 to 1964 are examined. A gradient of increasing fish size from east to west is noted. Males increase in ratio over females for the entire range of lengths examined, and beyond 170 cm comprise more than 75 per cent of the total. The first semester of the year is important as a bigeye spawning season. A general relationship between sexual maturity and thermal structure of the water is discussed. At the end of their 12th quarter of life bigeye are about 114 cm long, by the 16th quarter, 137 cm and at the end of 20 quarters, about 153 cm. The long-line fishery in the eastern Pacific has had a marked effect on the size composition of the stocks of bigeye, but whether the fishing has driven the stocks below a point which could afford a maximum sustainable yield could not be determined. (PDF contains 55 pages.)

Item Type: Article
Title: Size composition, growth and sexual maturity of bigeye tuna, Thunnus obesus (Lowe), from the Japanese long-line fishery in the Eastern Pacific Ocean
Personal Creator/Author:
CreatorsEmail
Kume, Susumu
Joseph, James
Journal or Publication Title: Inter-American Tropical Tuna Commission Bulletin
Volume: 11
Number: 2
Page Range: pp. 45-100
Date: 1966
Issuing Agency: Inter-American Tropical Tuna Commission
Additional Information: This article is bilingual and contains both Spanish and English translations.
Subjects: Fisheries
Item ID: 2929
Depositing User: Joan Parker
Date Deposited: 26 Feb 2010 12:11
Last Modified: 29 Sep 2011 18:12
URI: http://aquaticcommons.org/id/eprint/2929

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