Fry hatching barrel water body replacing device

The utility model relates to the field of aquaculture, in particular to a fry hatching barrel water body replacing device which comprises a net, an annular floating frame, a water pumping pipe and a sinker, the net comprises a net bag and a frame, an opening in the upper end of the net bag is fixed to the frame, the annular floating frame is embedded in the frame to enable the frame to float on the water surface, and the sinker is hung on the net bag. According to the utility model, the annular floating frame of the netting gear supports the netting gear to float on the water surface; the netbag divides a water pumping area in the hatching barrel; the water pumping pipe pumps water in the water pumping area according to the siphon principle, the fry are effectively prevented from being damaged, the sinker is hung on the net bag, on one hand, the net bag can be prevented from being adsorbed by a pipe opening of the water pumping pipe due to water flow, on the other hand, the bottom ofthe water pumping area div