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首页> 外文期刊>Aquatic Living Resources >Age and growth of blackfin tuna (Thunnus atianticus) caught under moored fish aggregating devices, around Martinique Island
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Age and growth of blackfin tuna (Thunnus atianticus) caught under moored fish aggregating devices, around Martinique Island

机译：在马提尼克岛附近，被系泊的鱼聚集装置捕获的黑鳍金枪鱼（Thunnus atianticus）的年龄和生长

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Daily growth increments measured in the otolith of Thunnus atlanticus were used to estimate the age and growth of individuals. which were sampled from an artisanal fishery operating around fish aggregating devices (FADs) moored off Martinique Island. In this study, 76 otoliths were analysed for fish ranging from 20 to 68 cm fork lengths (FL). The fish were caught using trolling lines at depths ranging from 0 to 10 m. Counts were made, under a light microscope, on the external part of the transverse section of the sagittae, from the primordium to the ventral edge. The mean coefficient of variation of the age reading was 2.4%. To validate readings, the number of increments for 11 individuals was counted using both optic and scanning electron microscopes. The calculated relationship between readings of both methods was found to be linear, with a slope of 1.03 and R-2 = 0.99. Frequency of growth increment formation could not be validated. Growth rates derived from otolith readings were, however, compared to those obtained using a modal progression analysis, which was performed on the length-frequency distributions of the landings over a period of two months. The corroboration between the growth rates was good. One increment was assumed to represent one day. The parameters of the von Bertalanffy growth curve for both sexes were L-infinity = 71.4 cm FL, k = 0.002 day(-1) and tau(0) = -80 days. According to our results, there is no evidence that Martinican moored FADs act as ecological traps for blackfin tuna. Instead, young blackfin tuna probably leave the vicinity of Martinican moored FADs to undergo a trophic migration at 7 to 8 month-old, and then come back about 8 months later to breed in the Lesser Antilles area.
机译：在大西洋金枪鱼的耳石中测得的每日生长增量用于估计个体的年龄和生长。这些样本是从停泊在马提尼克岛附近的鱼类聚集装置（FAD）附近的手工渔业中取样的。在这项研究中，分析了76耳石的鱼叉长度在20至68厘米之间（FL）。使用拖钓线在0至10 m的深度处捕获鱼。在光学显微镜下，从原基到腹缘，在矢状体横截面的外部进行计数。年龄读数的平均变异系数为2.4％。为了验证读数，使用光学显微镜和扫描电子显微镜对11个人的增量数进行了计数。发现这两种方法的读数之间的计算关系是线性的，斜率为1.03，R-2 = 0.99。增长增量形成的频率无法验证。但是，将取自耳石的读数的增长率与使用模态级数分析获得的增长率进行了比较，该模态级数分析是对两个月期间着陆点的长度-频率分布进行的。增长率之间的确证性很好。假定增量代表一天。男女的von Bertalanffy生长曲线的参数分别为L-无穷大= 71.4 cm FL，k = 0.002天（-1）和tau（0）= -80天。根据我们的结果，没有证据表明马提尼肯岛停泊的FADs是黑鳍金枪鱼的生态陷阱。取而代之的是，年轻的黑鳍金枪鱼可能离开停泊在马提尼克岛的FADs附近，在7到8个月大时进行营养迁移，然后大约8个月后回来在小安的列斯地区繁殖。

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