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首页> 外文期刊>日本水産学会誌 >Age, growth, maturation and life of bullet tuna Auxis rochei in the pacific waters off Kochi prefecture [Japanese]
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Age, growth, maturation and life of bullet tuna Auxis rochei in the pacific waters off Kochi prefecture [Japanese]

机译：在高知县附近太平洋水域中的金枪鱼Auxis rochei的年龄，生长，成熟和寿命[日语]

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摘要

Age, growth, maturation and life of bullet tuna A axis rochei collected in Kochi prefectural coastal waters from March 1993 to March 1998, were estimated from fork length, body weight, gonad weight, and the largest oocyte diameter of 124,485 individuals. The relationship between growth and age based on the monthly change of the fork length composition are: 0.5-year-old = 25 cm, 1-year-old = 29 cm, 1.5-year-old = 32 cm, 2-year-old 35 cm. Two groups of bullet tuna were recognized in this research area: One is the summer-birth group of which spawning occurs in Japanese coastal waters, and the other is the winter-birth group of which spawning occurs in winter in southern tropical waters. The latter group is supposed not to return the tropical waters. Maturation age of the summer-birth group is 1-year-old, whereas that of the winter-birth group is 1.5-year-old, and Ist spawning occurs in summer around Japanese coastal waters. Most fishes of the summer-birth group finish their life after spawning in 2-year-olds, while most fishes of the winter-birth group die after spawning in 1.5-year-olds.
机译：从1993年3月至1998年3月在高知县沿海水域采集的罗氏金枪鱼的年龄，生长，成熟和寿命是根据叉子的长度，体重，性腺重量和最大的卵母细胞直径124485个人估算的。根据叉子长度组成的每月变化，生长与年龄的关系为：0.5岁= 25厘米，1岁= 29厘米，1.5岁= 32厘米，2岁35厘米在该研究领域中，确认了两组子弹金枪鱼：一组是在日本沿海水域产卵的夏季出生群，另一组是在南部热带水域的冬季产卵的冬季出生群。后者应该不返回热带水域。夏季出生组的成熟年龄为1岁，而冬季出生组的成熟年龄为1.5岁，Ist产卵发生在夏季，日本沿海水域。夏季出生组中的大多数鱼在2岁时产卵后就结束了生命，而冬季出生组中的大多数鱼在1.5岁时产卵后死亡。

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