Migration patterns of young Pacific bluefin tuna (Thunnus orientalis) determined with archival tags
Migration patterns of young Pacific bluefin tuna (Thunnus orientalis) determined with archival tags
复制标题
用档案标签确定太平洋蓝鳍金枪鱼幼鱼（Thunnus orientalis）的洄游模式
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Nitta
中科院分区：
文献类型：
--
作者：
T. Itoh;S. Tsuji;A. Nitta
我们调查了太平洋幼鱼的迁徙和行为
蓝鳍金枪鱼（Thunnus orientalis）使用档案标签测量环境变量，将其记录在内存中，并使用测量的光线估计每日地理位置
程度.游泳深度，环境水温和喂养在配套文件中进行了描述。可以检查的标签位置估计的误差在经度上为-0.54° ±0.75°（平均值±SD），在纬度上为-0.12° ±3.06°。由标签自动估算的纬度是有问题的，但通过比较记录的海面温度和海面温度图估算的纬度是令人满意的。我们的结论是，档案标签是一个可靠的工具，估计位置的规模约一度，这是足够的蓝鳍金枪鱼迁徙研究。放生后，
在一天内表现出正常的游泳行为模式，在一个月内表现出正常的进食频率。此外，与档案标签的鱼保持体重在长度类似的野生鱼类，但它们的生长速度低于野生鱼类。在东海释放的166条植入档案标签的鱼类中，
包括一个穿越太平洋的物种。年轻的太平洋蓝鳍金枪鱼的迁移似乎包括两个阶段：居住阶段，占所有天数的80%以上，以及旅行阶段。个体
据观察，年轻的太平洋蓝鳍金枪鱼在一个持续两个多月的旅行阶段中覆盖了7600公里（该阶段的一部分是在两个月内完成的跨太平洋迁移）。在旅行阶段的许多行为特征与居住阶段相似，但内脏温度与环境温度之间的温差较大，进食频率略高，潜水到更深的水域更频繁。
We investigated the migration and behavior of young Pacific
bluefin tuna (Thunnus orientalis) using archival tags that measure environmental variables, record them in memory, and estimate daily geographical locations using measured light
levels. Swimming depth, ambient water temperature, and feeding are described in a companion paper. Errors of the tag location estimates that could be checked were –0.54° ±0.75° (mean ±SD) in longitude and –0.12° ±3.06° in latitude. Latitude, estimated automatically by the tag, was problematic, but latitude, estimated by comparing recorded sea-surface temperatures with a map of sea-surface temperature, was satisfactory. We concluded that the archival tag is a reliable tool for estimating location on a scale of about one degree, which is sufficient for a bluefin tuna migration study. After release, tagged fish
showed a normal swimming behavioral pattern within one day and normal feeding frequency within one month. In addition, fish with an archival tag maintained weight-at-length similar to that of wild fish; however, their growth rate was less than that of wild fish. Of 166 fish released in the East China Sea with implanted archival tags, 30 were
recovered, including one that migrated across the Pacific Ocean. Migration of young Pacific bluefin tuna appears to consist of two phases: a residency phase comprising more than 80% of all days, and a traveling phase. An individual
young Pacific bluefin tuna was observed to cover 7600 km in one traveling phase that lasted more than two months (part of this phase was a trans-Pacific migration completed within two months). Many features of behavior in the traveling phase were similar to those in the residency phase; however the temperature difference between viscera and ambient temperature was larger, feeding was slightly more frequent, and dives to deeper water were more frequent.