... High speed to increase oxygen 3)improve the fish yield 4)scientific for fish The Impellor Automatic Aerator for Aquaculture Feature & ... avoid death phenomenon, 4)is scientific for fish, increase the breeding density, improve the fish yield per unit of area, 5) ... company is also specialized for the fishery machine, the floating fish pellet machine and sinking pellet machine, if you have any interest,pls ...