Contributions of different spawning seasons to the stock of Pacific bluefin tuna Thunnus orientalis estimated from otolith daily increments and catch-at-length data of age-0 fish
Contributions of different spawning seasons to the stock of Pacific bluefin tuna Thunnus orientalis estimated from otolith daily increments and catch-at-length data of age-0 fish
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DOI：
10.2331/suisan.75.412
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发表时间：
2009-05-01
影响因子：
0.4
通讯作者：
Itoh, Tomoyuki
中科院分区：
文献类型：
--
作者：
Itoh, Tomoyuki
估算了不同产卵季节对0岁太平洋蓝鳍金枪鱼渔业资源的贡献。根据477只耳石日增量估计，产卵季节最早为3月至10月，分叉长度为17至93厘米，比以往报道的要长。通过比较每月长度数据和耳石年龄数据得出的生长曲线，将1993-1997年在日本渔场捕获的0岁鱼分为两个亚队列。其中一个亚群在7月初前受精，可能在台湾至西南群岛附近海域，占0岁渔获量的大部分（76%）。第二亚群的鱼在7月中旬之后受精，可能主要在日本海，平均占0龄渔获量的24%，1994年高达40%。
Contributions of different spawning seasons to the fishers, stock of age-0 Pacific bluefin tuna Thunnus orientalis were estimated. Spawning season estimated from otolith daily increments of 477 individuals from 17 to 93 cm in fork length ranged from March to October at the earliest which is longer than previously reported. Age-0 fish caught in Japanese fisheries in 1993-1997 were divided into two sub-cohorts by comparing monthly length data with the growth curves derived from otolith age data. Fish of one sub-cohort which were fertilized up to early July, probably in the area around Taiwan to the Nansei Islands, accounted for most (76%) of the age-0 catch. Fish of the second sub-cohort were fertilized after mid July, probably mainly in the Sea of Japan, and accounted for on average 24% of the age-0 catch, and as much as 40% in 1994.