A system for the polishing treatment of inner walls of aquatic enclosures includes at least one tank of abrasive mixture and at least one surface treatment head which communicates fluidically with the tank of abrasive mixture, a mover allowing the treatment head to be moved along the wall to be treated, and a supply allowing the treatment head to be supplied with a substantially continuous flow of abrasive mixture.

A system for the polishing treatment of inner walls of aquatic enclosures includes at least one tank of abrasive mixture and at least one surface treatment head which communicates fluidically with the tank of abrasive mixture, a mover allowing the treatment head to be moved along the wall to be treated, and a supply allowing the treatment head to be supplied with a substantially continuous flow of abrasive mixture.

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.

The present invention relates to a modular offshore fish farm (1) comprising one or more closed net cages (2) and a service unit (S), each closed net cage being supported by a buoyant body (3) which is configured for floating in a body of water (W), wherein each closed net cage is configured for moving vertically in a body of water relative to the buoyant body, each buoyant body comprising a number of buoyant elements, where each buoyant body comprises connecting means for connecting to an adjacent buoyant body, the buoyant bodies providing a working platform between the closed net cages, where each closed net cage comprises a suppressing device (10).

The present invention relates to a modular offshore fish farm (1) comprising one or more closed net cages (2) and a service unit (S), each closed net cage being supported by a buoyant body (3) which is configured for floating in a body of water (W), wherein each closed net cage is configured for moving vertically in a body of water relative to the buoyant body, each buoyant body comprising a number of buoyant elements, where each buoyant body comprises connecting means for connecting to an adjacent buoyant body, the buoyant bodies providing a working platform between the closed net cages, where each closed net cage comprises a suppressing device (10).

An aquarium cleaning device for cleaning an inner surface of an aquarium wall includes a flexible cleaning body and a flexible handle member. The cleaning body and the handle member are magnetically attracted to each other. The flexibility in the cleaning body and the handle member allows the cleaning device to contour and conform to curved surfaces in the aquarium tank. The flexibility of the cleaning body and handle member are achieved by areas of flexibility having alternating recesses and fins.

An aquarium cleaning device for cleaning an inner surface of an aquarium wall includes a flexible cleaning body and a flexible handle member. The cleaning body and the handle member are magnetically attracted to each other. The flexibility in the cleaning body and the handle member allows the cleaning device to contour and conform to curved surfaces in the aquarium tank. The flexibility of the cleaning body and handle member are achieved by areas of flexibility having alternating recesses and fins.

A tool for cleaning inside of a water tank utilizing a siphon action is provided in which a scraping tool (S) is pivotably provided at an upstream end of a suction pipe (P), a deposit (b) such as moss caked on a bottom face or a side face within the water tank is scraped off by a scraping blade (62) formed at an extremity of the scraping tool (S), and is removed by sucking up together with dirt (a).

A tool for cleaning inside of a water tank utilizing a siphon action is provided in which a scraping tool (S) is pivotably provided at an upstream end of a suction pipe (P), a deposit (b) such as moss caked on a bottom face or a side face within the water tank is scraped off by a scraping blade (62) formed at an extremity of the scraping tool (S), and is removed by sucking up together with dirt (a).