1. College of Marine Technology ＆ Science, Shanghai Ocean Univ. , Shanghai 201306, China; 2. The Key Laboratory of Shanghai Education Commis sion for Oceanic Ocean Resources Exploitation, Shanghai Ocean Univ. , Shanghai 201306, China; 3. School of Life Science, East China Normal University, Shanghai 200062, China;4. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Shanghai Ocean University, Ministry of Education, Shanghai 201306, China
Abstract: The biological features including fork length, dressed body weight, maturity stages, feeding intensity and sex ratio of bigeye tuna Thunnus obesus caught in the central Atlantic Ocean were analyzed base on the data collected by Fishery Scientific Observers boarded on China tuna longline fleet from December 2005 to May 2006. The results showed that the dominant fork length ranged from 105 to 140 cm, and the dominant dressed body weight varied from 20 to 40 kg. The feeding intensity was found to be in the grade 0 to 4 and the gonadal maturity was dominant in stages Ⅱ, and Ⅲ. There was distinct difference in maturity between the female and the male. The relationship between fork length and dressed body weight was W = 1. 3373 × 10^-5L^3.0147,R^2 =0. 9691. Compared with other domestic authors, there were no significant differences in the biological features of the bigeye tuna in the Central Atlantic Ocean in recent years.
2009, Vol. 24 
