Swimming depth, ambient water temperature preference, and feeding frequency of young Pacific bluefin tuna (Thunnus orientalis) determined with archival tags
Swimming depth, ambient water temperature preference, and feeding frequency of young Pacific bluefin tuna (Thunnus orientalis) determined with archival tags
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根据档案标签确定太平洋蓝鳍金枪鱼幼鱼的游泳深度、环境水温偏好和进食频率
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发表时间：
2003
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通讯作者：
A. Nitta
中科院分区：
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作者：
T. Itoh;S. Tsuji;A. Nitta
我们调查了年轻的太平洋蓝鳍金枪鱼（东方金枪鱼）的迁移和行为使用档案标签。档案标签测量环境变量，记录
它可以将它们存储在内存中，并根据测量的光照水平估计每日的地理位置。166档案
1995年至1999年在东海东北端放生的太平洋蓝鳍金枪鱼植入标签
1997年，30个标签被回收，其中一个来自穿越太平洋的鱼类。本文描述了游泳深度，环境水温，和投饵频率的基础上检索数据的太平洋蓝鳍金枪鱼。在另一篇论文中描述了标签性能、标签对鱼的影响以及物种的水平运动。
幼太平洋蓝鳍金枪鱼主要在混合层中游泳，通常靠近海面，在较深的水域游泳
在白天比在晚上。它们还表现出深度变化的模式，对应于日出和日落，
显然是为了避免特定的低光照水平。档案标签记录了内脏的温度变化，
这些变化表明，太平洋蓝鳍金枪鱼幼鱼通常在黎明和白天进食，但很少在黄昏或夜间进食。如图所示，水温限制了它们的分布
它们的垂直分布随温跃层深度的季节变化而变化，而且它们的水平分布在大多数情况下局限于14 - 20°C温度范围内的水中。
We investigated the migration and behavior of young Pacific Bluefin tuna (Thunnus orientalis) using archival tags. The archival tag measures environmental variables, records
them in its memory, and estimates daily geographical locations based on measured light levels. Of 166 archival
tags implanted in Pacific bluefin tuna that were released at the northeastern end of the East China Sea from 1995 to
1997, 30 tags were recovered, including one from a fish that migrated across the Pacific. This article describes swimming depth, ambient water temperature, and feeding frequency of young Pacific bluefin tuna based on retrieved data. Tag performance, effect of the tag on the fish, and horizontal movements of the species are described in another paper.
Young Pacific bluefin tuna swim mainly in the mixed layer, usually near the sea surface, and swim in deeper water
in daytime than at nighttime. They also exhibit a pattern of depth changes, corresponding to sunrise and sunset,
apparently to avoid a specific low light level. The archival tags recorded temperature changes in viscera that
appear to be caused by feeding, and those changes indicate that young Pacific bluefin tuna commonly feed at dawn and in the daytime, but rarely at dusk or at night. Water temperature restricts their distribution, as indicated
by changes in their vertical distribution with the seasonal change in depth of the thermocline and by the fact that their horizontal distribution is in most cases confined to water in the temperature range of 14−20°C.