| abstract |
(57) [Summary] [Structure] In the oxygen blowing device according to the present invention, an oxygen bubble generating member which is disposed at the tip of the device and is submerged in seawater or the like in a water tank is formed of a carbon material. 1. The average radius of the holes measured by mercury porosimeter is 2. The ratio of the cumulative volume A of holes having a radius of 4.0 μm or more and the cumulative volume B of holes having a radius of 0.01 μm or more is set to a range of 0 to 0.6 μm and A / B ≦ 0.2. It has been set. [Effect] The wettability of the oxygen bubble generating member to water becomes good, and the oxygen bubbles can be efficiently supplied to the water in the water tank in a good condition. Therefore, the solubility of oxygen in the water becomes good, so that less water is used. You can keep a large amount of fish in. Therefore, the water tank can be made smaller, Since the transportation space for airplanes will be smaller and the transportation cost per fish will be reduced, it will be possible to provide live fish at low cost to customers. |