Effects of tank shapes and aerations on survival, growth and swim bladder inflation of red seabream Pagrus major larvae
Effects of tank shapes and aerations on survival, growth and swim bladder inflation of red seabream Pagrus major larvae
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水池形状和通气对真鲷幼体存活、生长和鳔膨胀的影响
DOI：
10.1016/j.aqrep.2020.100451
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发表时间：
2020
影响因子：
3.7
通讯作者：
Sakakura Yoshitaka
中科院分区：
文献类型：
--
作者：
Aung Naing Win;Yamazaki Wataru;Sumida Tetsuya;Hagiwara Atsushi;Sakakura Yoshitaka
本研究的目的是寻求小规模养殖红鳍金枪鱼仔鱼的最适条件。我们研究了水箱形状和通气量的影响，这被认为是影响幼虫的存活、生长和鱼囊充气OFP。主要幼虫。海水(50-L)填充于3个圆柱形(CT：1.7×103 cm~2水面，30 cm深)和6个矩形(RT：1.8×103 cm~2水面，28 cm深)水槽中。在三个CT和RT(RT1AS)的底部中心放置一个充气量为100ml/min的气石，在三个RT(RT2AS)的半底中心放置两个充气量为50ml/min的气石(RT2AS)。500个鸡蛋被分配到每个实验水箱中。在孵化后3d(DPH)，以每毫升10只轮虫投喂幼虫，测定其在水箱中的分布。14DPH时CT组和RT1AS组的存活率(54.7±11.0%)和RT1AS组(55.3±6.0%)显著高于RT2AS组(29.6±9.3%，P<0.05)。然而，不同池型和曝气器的幼虫生长没有显著差异。不同水箱形状和充气方式的患者，其充盈率无明显差异，但CT(58.9±28.3%)呈下降趋势(RT1AS为94.4±6.9%，RT2AS为92.2±10.7%)。轮虫在储罐中的分布以储罐底部较高(p<；0.05)。在CT和RT1AS中，由于单对涡系，沿储罐侧壁和底部观察到了低流区；在RT2AS中，由于两个单对涡系，在中心(气石之间)和从气石到罐壁形成了低流区。这些低流区与罐底轮虫较高的分布区相吻合，表明通过测量轮虫密度可以估算罐内的流量。我们推荐一种带气石系统的长方形鱼缸，用于养殖红鳍金枪鱼。
This study aimed to seek for the optimal condition for small-scale larviculture of red seabreamPagrus majorlarvae. We examined the effects of tank shapes and aerations, which were assumed to influence the larval survival, growth and swim bladder inflation ofP. majorlarvae. Seawater (50-l) was filled into three cylindrical (CT: 1.7 × 103cm2water surface area, 30 cm deep) and six rectangular (RT: 1.8 × 103cm2water surface area, 28 cm deep) tanks. One air stone with 100 ml/min aeration rate was set at the bottom center of three CT and RT (RT1AS), and two air stones with 50 ml/min aeration rate were set at the half bottom center of three RT (RT2AS). Five hundred eggs were distributed into each experimental tank. Rotifers were fed to larvae at 10 individuals/mL on 3 days post hatching (dph) and their distribution in tanks were measured. Survival rate at 14 dph in CT (54.7 ± 11.0 %) and RT1AS (55.3 ± 6.0 %) were significantly higher than that in RT2AS (29.6 ± 9.3 %,p< 0.05). However, the growth of larvae was not significantly different between tank shapes and aerators. Swimbladder inflation rates were not different between tank shapes and aerations, however, CT (58.9±28.3 %) showed lower trend (RT1AS 94.4±6.9 %, RT2AS 92.2±10.7 %). Rotifer distribution in tanks was higher at tank bottom (p< 0.05). Low flow regions were observed along the side walls of the tanks and bottom areas in CT and RT1AS due to a single-pair vortex system and formed at the center (between air stones) and from the air stone to the tank walls in RT2AS due to two single-pair vortex systems. These low-flow areas were coincided with higher rotifer distribution areas at the tank bottom indicating that measuring rotifer density can estimate the flow in a tank. We recommend the rectangular tank with one air stone system for red seabream larvae.
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