Effect of tank shape on survival and growth of Pacific bluefin tuna Thunnus orientalis larvae
Effect of tank shape on survival and growth of Pacific bluefin tuna Thunnus orientalis larvae
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水池形状对太平洋蓝鳍金枪鱼Thunnus orientalis幼体存活和生长的影响
DOI：
10.1016/j.aquaculture.2020.735283
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发表时间：
2020
期刊：
影响因子：
4.5
通讯作者：
Sakakura Yoshitaka
中科院分区：
文献类型：
--
作者：
Aung Naing Win;Yamazaki Wataru;Hasegawa Takamasa;Higuchi Kentaro;Takashi Toshinori;Gen Koichiro;Sumida Tetsuya;Hagiwara Atsushi;Sakakura Yoshitaka
我们研究了饲养池形状对太平洋蓝鳍金枪鱼Thunnus orientalislarvae 存活和生长的影响。圆柱形（1.7 × 103 cm2 水表面积；30 cm 深）和矩形（1.8 × 103 cm2 水表面积；28 cm 深）水箱（各 n = 3）装有 50 l 海水。每个池的底部中心设置一颗通气速率为 100 毫升/分钟的空气石。水面光强度为 2000 lx，光周期为 24 L:0D。孵化后 2 天 (dph) 将幼虫以 10 条/升的速度引入每个池中。以 10 个体/ml 喂食轮虫并测量它们在水箱中的分布。 8 dph 时，圆柱形水箱中的幼虫存活率 (CT；52.7 ± 5.1%) 高于矩形水箱中的幼虫存活率 (RT；0.8 ± 0.7%，p<.01)。同时，不同罐体形状的幼虫生长在体长（CT：4.23 ± 0.26 mm；RT：4.09 ± 0.20 mm）或干重（CT：95.1 ± 17.6 μg；RT：67.7 ± 10.9 μg）方面没有显着差异。幼虫的鱼鳔膨胀率在不同的水箱形状之间也没有显着差异（CT：16.5 ± 14.5%；RT：56.9 ± 3.47%）。两种形状的轮虫分布在水箱底部都较高 (p< .05)。罐中的两相气泡流模拟表明，RT 中的低流量区域更大。罐底的低流量区域因罐体形状而异，在CT中出现在底部罐壁边缘，在RT中出现在罐体中心（气石）到罐壁。池底的这些低流量区域与轮虫分布较高的区域重合，这可能是鱼幼体下沉综合症的原因。我们的结果表明，小规模 (50-l) PBT 幼虫培养实验可以使用 CT 和现有的曝气系统进行，而 RT 需要改进的曝气器来代替单个空气石。
We examined the effect of rearing tank shape on survival and growth of Pacific bluefin tunaThunnus orientalislarvae. Cylindrical (1.7 × 103cm2water surface area; 30 cm deep) and rectangular (1.8 × 103cm2water surface area; 28 cm deep) tanks (n = 3 each) were filled with 50 l of seawater. One air stone with a 100 ml/min aeration rate was set at the bottom center of each tank. Light intensity at the water surface was 2000 lx with a photoperiod of 24 L:0D. Larvae were introduced into each tank at a rate of 10 individuals/l at 2 days post-hatching (dph). Rotifers were fed at 10 individuals/ml and their distribution in tanks was measured. Survival of larvae in cylindrical tanks (CT; 52.7 ± 5.1%) at 8 dph was higher than that in rectangular tanks (RT; 0.8 ± 0.7%,p< .01). Meanwhile, larvae growth was not significantly different between tank shapes either in body length (CT: 4.23 ± 0.26 mm; RT: 4.09 ± 0.20 mm) or dry weights (CT: 95.1 ± 17.6 μg; RT: 67.7 ± 10.9 μg). The swimbladder inflation rate of larvae also did not differ significantly between tank shapes (CT: 16.5 ± 14.5%; RT: 56.9 ± 3.47%). Rotifer distribution was higher at tank bottom in both shapes (p< .05). Two-phase bubbly flow simulations in the tanks revealed that the low-flow area was larger in the RT. The low-flow area at tank bottom varied by tank shape, occurring at the edge of the tank wall on the bottom in the CT, and from the center of the tank (air stone) to the tank wall in the RT. These low-flow areas at tank bottom coincided with areas of higher rotifer distribution, which may be a cause of sinking syndrome in fish larvae. Our results indicate that small-scale (50-l) PBT larviculture experiments can be conducted using a CT with the present aeration system, and that an RT requires an improved aerator in place of the single air stone.
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