The present disclosure provides a recirculation aquaculture system and method. The system includes a fish pond and a fiber turntable filtering system. The fiber turntable filtering system can implement can remove large particles in aquaculture water and regularly harvest microalgae, water quality after treatment reaches a fishery aquaculture standard, and 97% of the aquaculture water can be directly recycled. In the present disclosure, during in-situ culture of microalgae and fish, microalgae can convert CO.sub.2 exhaled by fish and nutrients such as nitrogen and phosphorus in the aquaculture water into substances of algae cells, such as proteins, polysaccharides, vitamins, and lipids, and release oxygen, so as to quickly improve quality of the aquaculture water; in-situ culture of the microalgae and the fish gives play to the advantages of high photosynthetic efficiency of the microalgae, and the fast-growing microalgae provide a suitable growth environment for the fish.

The present disclosure provides a recirculation aquaculture system and method. The system includes a fish pond and a fiber turntable filtering system. The fiber turntable filtering system can implement can remove large particles in aquaculture water and regularly harvest microalgae, water quality after treatment reaches a fishery aquaculture standard, and 97% of the aquaculture water can be directly recycled. In the present disclosure, during in-situ culture of microalgae and fish, microalgae can convert CO.sub.2 exhaled by fish and nutrients such as nitrogen and phosphorus in the aquaculture water into substances of algae cells, such as proteins, polysaccharides, vitamins, and lipids, and release oxygen, so as to quickly improve quality of the aquaculture water; in-situ culture of the microalgae and the fish gives play to the advantages of high photosynthetic efficiency of the microalgae, and the fast-growing microalgae provide a suitable growth environment for the fish.

A fish rearing tank has an egg-shaped shell with a vertical long axis and gradually narrowing shape towards a tip portion. The egg-shaped shell holds a water volume for the contained fish in a major wider, lower portion, and encloses air in the minor, upper, tip portion. The shell forms a closed, rigid tank and has one or more water inlets, and one or more water outlets. A ring-shaped buoyancy collar is mounted on the egg-shaped shell. The shell has a fixed ballast in the lower end of said wider, lower portion of the egg-shaped shell.

A fish rearing tank has an egg-shaped shell with a vertical long axis and gradually narrowing shape towards a tip portion. The egg-shaped shell holds a water volume for the contained fish in a major wider, lower portion, and encloses air in the minor, upper, tip portion. The shell forms a closed, rigid tank and has one or more water inlets, and one or more water outlets. A ring-shaped buoyancy collar is mounted on the egg-shaped shell. The shell has a fixed ballast in the lower end of said wider, lower portion of the egg-shaped shell.

The present invention is a highly-efficient, self-propelled apparatus for cleaning nets used for farming of fish and other organisms while the nets are submerged.

In various embodiments, the invention includes two rotating washer head assemblies, with spray bars and corresponding deflector plates. A high-pressure water stream is discharged from the spray bars at an angle that creates a torque force to actuate and maintain rotational movement of the washer head assemblies. The subsequent deflection of the high-pressure water stream by the deflector plates creates a thrusting force to propel the self-propelled apparatus toward the nets.

The present invention is a highly-efficient, self-propelled apparatus for cleaning nets used for farming of fish and other organisms while the nets are submerged.

In various embodiments, the invention includes two rotating washer head assemblies, with spray bars and corresponding deflector plates. A high-pressure water stream is discharged from the spray bars at an angle that creates a torque force to actuate and maintain rotational movement of the washer head assemblies. The subsequent deflection of the high-pressure water stream by the deflector plates creates a thrusting force to propel the self-propelled apparatus toward the nets.

An apparatus for cleaning nets underwater formed from a propeller housing with a centrally disposed axis with a plurality of blades extending therefrom. An outer perimeter ring secured to an outer tip of each blade with a plurality of knuckles secured to the outer perimeter ring. Each knuckle including a curved surface constructed and arranged to be forcefully presented to the aquaculture net upon rotation of said blades for removal of growth by impact and shaking of the aquaculture net. An elastomeric hub prevents spike loads.

An apparatus for cleaning nets underwater formed from a propeller housing with a centrally disposed axis with a plurality of blades extending therefrom. An outer perimeter ring secured to an outer tip of each blade with a plurality of knuckles secured to the outer perimeter ring. Each knuckle including a curved surface constructed and arranged to be forcefully presented to the aquaculture net upon rotation of said blades for removal of growth by impact and shaking of the aquaculture net. An elastomeric hub prevents spike loads.

A fish rearing tank has an egg-shaped shell with a vertical long axis and gradually narrowing shape towards a tip portion. The egg-shaped shell holds a water volume for the contained fish in a major wider, lower portion, and encloses air in the minor, upper, tip portion. The shell forms a closed, rigid tank and has one or more water inlets, and one or more water outlets. A ring-shaped buoyancy collar is mounted on the egg-shaped shell. The shell has a fixed ballast in the lower end of said wider, lower portion of the egg-shaped shell.

A fish rearing tank has an egg-shaped shell with a vertical long axis and gradually narrowing shape towards a tip portion. The egg-shaped shell holds a water volume for the contained fish in a major wider, lower portion, and encloses air in the minor, upper, tip portion. The shell forms a closed, rigid tank and has one or more water inlets, and one or more water outlets. A ring-shaped buoyancy collar is mounted on the egg-shaped shell. The shell has a fixed ballast in the lower end of said wider, lower portion of the egg-shaped shell.