博文
Reproductive biology of bigeye tuna in Eastern Pacific Ocean
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Understanding
reproductive potential of any species is of great importance to their resource
assessment and management. In this study, the reproductive biology of bigeye
tuna, Thunnus obesus, was studied
based on 1,283 samples taken from the Chinese longline vessels in the eastern
and central Tropical Pacific Ocean during February through November 2006. The female-male
ratio was 1.0 : 1.5 and males were predominant in all length classes except for
the length class of 166 - 170 cm
(fork length). Males dominated in sizes larger than 171 cm, all specimens of 192 cm or larger were males. The main spawning period
of bigeye tuna occurred between March and November. Gonadosomatic rate of males
were larger than that of females to specific length classes. Statistically,
female and male bigeye tuna had no significant reproductive seasonality. The observed
minimum length at sexual maturity for female bigeye tuna was 94 cm. Length at 50% sexual maturity of
female bigeye tuna was estimated at 107.8 cm, and maturation rate
was 0.106 cm-1.
The results derived in this study provide the information critical to our
understanding of key life history parameters of bigeye tuna in tropic Pacific Ocean.
https://blog.sciencenet.cn/blog-223390-429192.html
上一篇：南极磷虾调查CPUE指数变动的影响因素初步分析
下一篇：Size at sexual maturity of bigeye tuna
https://blog.sciencenet.cn/blog-223390-429192.html
上一篇：南极磷虾调查CPUE指数变动的影响因素初步分析
下一篇：Size at sexual maturity of bigeye tuna
