The invention provides an
inflatable water-replaceable net
cage device used in a
shellfish larva cultivation process and a use method thereof. The device comprises a net cage framework, a filter screen, a water replacing hose and inflating devices. The cylindrical net cage framework is made of stainless steel and divided into an inner frame and an outer frame, the
diameter of the outer frame is large, and the outer frame is mainly used for supporting the whole device; the
diameter of the inner frame is small, the bottom of the inner frame is 5-8 cm higher than the bottom of the outer frame, hard drainage
pipe fixing rings are welded to the central portions of the upper and lower parts of the inner frame respectively, the lower fixing ring is 15-20 cm away from the bottom of the inner frame, a hard drainage
pipe is positioned in the fixing rings, one end of the water replacing hose is put into the hard drainage
pipe, and water replacement operation is carried out by utilizing the siphonprinciple. The filter screen sleeves the inner frame, and the upper end of the filter screen is fixed to the upper end of the net cage framework through a
rope body on the outer wall of the filter screen. The inflating devices are nano inflation pipes which are fixed to the inner frame and the outer frame respectively, and the lengths of the nano inflation pipes are the same as the circumferencesof the inner frame and the outer frame respectively; an air inlet pipe is connected with the nano inflation pipes through a tee joint and fixed to the net cage framework, and an air
inlet valve is arranged at an air inlet of the air inlet pipe. By utilizing the use method of the
inflatable water-replaceable net
cage device, the labor cost can be reduced by 80% or above, and the adhesion rate of larvae adhering to the filter screen during water replacement is lowered by 70-90%.