Escape rescue system of fishes from Hypoxia using natural energy

提出了以自然能量为基础，利用缺氧水上涌降低鱼类死亡率的系统，并对其可行性进行了研究。对渔业鱼类的水质和生态行为进行了全面观察，阐明了渔业鱼类的氧变异性和后续回避行为。鱼类的三维行为与溶解氧的变化相对应，其阈值与实验数据基本一致。数值模拟的案例研究结果表明，在最坏的缺氧情况下，曝气系统无法恢复足够的氧气水平，但在氧气充足的情况下，它可能是有用的。在地表水里。

The system which reduces the mortality of fishes by upwelling of oxygen-depleted water(hypoxia), based on the natural energy, was proposed and its feasibility was studied. Overall observations of water quality and ecological behaviors of fishery fishes were conducted for clarifying the oxygen variability and following avoidance behavior of fishery fishes. 3-dimensional behavior of fishes occurred corresponding to the variation of dissolved oxygen and their threshold values were almost coincident with the experimental data. Results of case studies of numerical simulations suggested that the aeration system could not recover the oxygen level enough for fish survival in the worst case of hypoxia, but that it could be useful in the case with the enough oxygen. in the surface water.