A water changing device for aquaculture breeding, comprises a breeding box. A drainage pipe is inserted into the inner wall below the breeding box; the drainage pipe has an L-shaped structure, and the horizontal side is located at the lower side of the breeding box; a sealing block is tightly inserted above the drainage pipe; a circular ring is arranged on the outer side wall of the upper end of the drainage pipe; a groove is arranged above the circular ring along the circumferential direction, and a filter screen is tightly inserted into the groove; the side wall of the drainage pipe below the breeding box is fixedly connected with a horizontal rod, and one side of the side wall below the breeding box close to the horizontal rod is fixedly provided with a threaded rod.

A water tank cleaning tool comprising an underwater air vacuum with separate air and water exhaust channels, allowing the user to vacuum and clean the tank substrate without removing water from the tank.

A vacuum airlift system for treating an aqueous effluent includes an upflow liquid portion, where the upflow liquid portion is configured to retain a fluid, and a fluid inlet, the fluid inlet being fluidly coupled with the upflow liquid portion, where the fluid inlet is positioned at about a bottom of the upflow liquid portion. The vacuum airlift system can also include a downflow liquid portion, where the downflow liquid portion is fluidly coupled with the upflow liquid portion, and a fluid outlet, the fluid outlet being fluidly coupled with the downflow liquid portion, where the fluid outlet is positioned at about a bottom of the downflow liquid portion. The vacuum airlift system can also include a plurality of aerators fed by one or more fluidic oscillators, the plurality of aerators being coupled to the upflow liquid column.

An aquarium requiring no more than only a single power connection. The aquarium includes: (a) a transparent tank having a surrounding wall with an enclosure rim surrounding an open top and an opposite closed bottom wall; (b) an electrically powered lighting arrangement; (c) an electrically powered pump oriented within an interior of the tank; (d) a base supporting the tank under the bottom wall of the tank; and (e) a junction box integrally formed with the base and having an aperture arrangement accessible from adjacent the surrounding wall having an electrical power port for removable insertion of an electrical power cord to provide power for the lighting arrangement and the pump.

A vacuum airlift system for treating an aqueous effluent includes an upflow liquid portion, where the upflow liquid portion is configured to retain a fluid, and a fluid inlet, the fluid inlet being fluidly coupled with the upflow liquid portion, where the fluid inlet is positioned at about a bottom of the upflow liquid portion. The vacuum airlift system can also include a downflow liquid portion, where the downflow liquid portion is fluidly coupled with the upflow liquid portion, and a fluid outlet, the fluid outlet being fluidly coupled with the downflow liquid portion, where the fluid outlet is positioned at about a bottom of the downflow liquid portion. The vacuum airlift system can also include a plurality of aerators fed by one or more fluidic oscillators, the plurality of aerators being coupled to the upflow liquid column.

Provided is a purification method for water to be used for culture of an aquatic organism, wherein the method includes a nitrification step of oxidizing ammonia to nitric acid using a nitrifying bacterium adhering to a base material containing an alkaline earth metal, and a denitrification step of reducing nitric acid to nitrogen using a denitrifying bacterium adhering to a base material containing a biodegradable resin which has a structural unit derived from dicarboxylic acid.

A recirculating aquaculture system comprising a microorganism growing apparatus and a method of using microorganisms to remove a pollutant from a fluid utilized in a recirculating aquaculture system. Furthermore, the microorganisms are harvested and used as a foodstuff fertilizer, biofuels, and bioplastics.

A vertically-stacked growing system includes vertical beams and horizontal shelves respectively arranged on different vertical levels. Each horizontal shelf has a length and a width, and includes horizontal structural supports coupled to at least some of the vertical beams, decking coupled to the horizontal structural supports, and multiple walls to form a shallow pond when the horizontal shelf contains a plant nutrient water culture, thereby constituting a growing layer of the growing system. The walls include two side walls along the length and two end walls along the width. Each horizontal shelf further includes a loading and/or unloading apparatus to facilitate loading and/or unloading of a plurality of rafts into and/or out of the shallow pond, via the two end walls, wherein respective rafts of the plurality of rafts include a plurality of germinated plants. At least a first horizontal shelf further comprises a raft conveyance system to move at least a first raft of the plurality of rafts through a first shallow pond contained in the first horizontal shelf.

A sterilizer for an aquarium includes a pump for sucking water in an aquarium and a filtering member for filtering the water. The pump includes an inlet from which the water in the aquarium is sucked. The filtering member is connected to the underside of the pump and includes an outlet through which the filtered water flows back into the aquarium. Multiple reflectors are connected to the periphery of the filtering member, and a coat is mounted to outside of the filtering member and covers the reflectors. Multiple ultraviolet sterilizer bulbs are located in the filtering member so as to treat the water sucked from the pump. A cotton sleeve is mounted to the pump and located around the inlet to remove debris and grease.

Disclosed is an aquarium that includes a tank, a magnetic induction transmission apparatus, and a first electric equipment disposed in the tank. The magnetic induction transmission apparatus includes a driving module and a receiving module. The driving module is disposed outside the tank and adjacent to a tank wall of the tank and is configured to be separable from the tank, and the receiving module is disposed on the tank wall of the tank and disposed corresponding to a position of the driving module. The driving module is connected to an external power source. The receiving module is connected to the first electric equipment and is operative to generate an induced current when the driving module is powered on.