Ontogeny of swim bladder inflation and caudal fin aspect ratio with reference to vertical distribution in Pacific bluefin tuna Thunnus orientalis larvae
Ontogeny of swim bladder inflation and caudal fin aspect ratio with reference to vertical distribution in Pacific bluefin tuna Thunnus orientalis larvae
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太平洋蓝鳍金枪鱼东方鱼鳔充气和尾鳍长宽比垂直分布的个体发育
DOI：
10.1007/s12562-014-0809-8
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发表时间：
2014
影响因子：
1.9
通讯作者：
T. Takagi
中科院分区：
文献类型：
--
作者：
Y. Ina;W. Sakamoto;S. Miyashita;H. Fukuda;S. Torisawa;T. Takagi
有必要了解太平洋蓝鳍金枪鱼东方水产养殖沉没死亡的过程，以便开发预防或尽量减少这一问题的方法。我们观察了太平洋蓝鳍金枪鱼2-9日夜间在水柱中的垂直分布以及幼鱼的形态特征，以阐明其沉没死亡的过程。使用长方体水箱（高 300 厘米）来测量垂直分布。统计观察池内4个区域的幼虫数量：上层（水深0-100 cm）、中层（100-200 cm）、下层（200-300 cm）和底部区域。孵化后 4 天，这些区域的幼虫分布呈两极分化，向上层和底部区域。孵化后 3 天，在上层观察到鱼鳔膨胀的个体。孵化后的任何一天，底部区域均未观察到鱼鳔膨胀的幼虫。鱼鳔充气和未充气的幼体上层的总长和尾鳍长宽比均大于底部区域的幼体。鱼鳔未充气的幼虫无法充分发育而无法游泳，从而沉入池底并死亡。鱼鳔发育和尾鳍游泳能力与沉没死亡密切相关。
It is necessary to understand the processes involved in sinking death in Pacific bluefin tunaThunnus orientalisaquaculture in order to develop methods to prevent or minimize this problem. We observed the nighttime vertical distribution of Pacific bluefin tuna in the water column on 2–9 DAH and the morphological characteristics of the larvae, in order to clarify the processes involved in sinking death. A cuboid tank (height 300 cm) was used to measure vertical distribution. The number of larvae was counted in each of 4 regions in the observation tank: upper layer (water depth 0–100 cm), middle layer (100–200 cm), lower layer (200–300 cm), and bottom area. The distribution of larvae in these regions at 4 days after hatching was polarized to the upper layer and bottom area. Individuals with inflated swim bladders were observed in the upper layer 3 days after hatching. No larvae with inflated swim bladders were observed in the bottom area on any day after hatching. Total body length and caudal fin aspect ratio of larvae with both inflated and un-inflated swim bladders were greater in the upper layer than those of larvae in the bottom area. Larvae with un-inflated swim bladders that failed to develop sufficiently for swimming sank to the tank bottom and died. Swim bladder development and caudal fin swimming ability are strongly related to sinking death.
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DOI：
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发表时间：
2006
期刊：
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影响因子：
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作者：
Takashima;Y.;Nakayama;Y.;Watanabe;K.;Itono;T.;Ueyama;N.;Nakamura;A.;Yasuda;H.;Harada;A.;Ikeda D et al.;Shigeru Miyashita
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DOI：
--
发表时间：
2005
期刊：
Aquaculture Research 36
影响因子：
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发表时间：
2006
期刊：
Aquaculture Research 37
影响因子：
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作者：
N.Takaya;H.Shoun;Toshinori Takashi
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