A system for causing an upwelling to create a fishery without altering thermoclines in a body of water, having: an electric pump housed in a floating buoy; and a heat exchanger hose having a plurality of protrusions; wherein the heat exchanger hose and the electric pump are configured to pump nutrient-rich water from a first depth of the body of water to a second depth of the body of water closer to a surface of the body of water than the first depth; wherein the plurality of protrusions is configured for transferring heat from surrounding waters to the pumped water; and wherein the system releases the pumped water only when it is warmed to around the ambient water temperature of the second depth of the body of water, such that the pumped water remains at the second depth without immediately sinking back down to the first depth.

A system for causing an upwelling to create a fishery without altering thermoclines in a body of water, having: an electric pump housed in a floating buoy; and a heat exchanger hose having a plurality of protrusions; wherein the heat exchanger hose and the electric pump are configured to pump nutrient-rich water from a first depth of the body of water to a second depth of the body of water closer to a surface of the body of water than the first depth; wherein the plurality of protrusions is configured for transferring heat from surrounding waters to the pumped water; and wherein the system releases the pumped water only when it is warmed to around the ambient water temperature of the second depth of the body of water, such that the pumped water remains at the second depth without immediately sinking back down to the first depth.

An engineered recirculating aquaculture fish pond and a fish culture method are provided. The engineered recirculating aquaculture fish pond is simple to operate, has strong adaptability to different culture environments or culture varieties, and is not only suitable for large-scale aquaculture enterprises but also suitable for small-scale farmers. An aeration water lifting device is designed to simultaneously perform aeration and drainage, which can reduce the use of electric equipment, decrease the production and maintenance cost, improve the cost performance of single equipment, and save the internal use space of the pond. Nozzles are arranged in more than two directions, which is convenient for performing aeration in different directions, uniformly dispersing impurities carried in water in a deep ditch, intercepting to reduce local blockage, improving a single utilization rate of an intercept structure, and preventing heavier impurities from accumulating at a channel bottom of the deep ditch.

An aquarium includes a container that contains a liquid. A spout includes a first leg that extends along a first axis from an inlet positioned in a bottom portion of the aquarium space to a bend, and a second leg that extends along a second axis from a flow aperture formed adjacent the bend to an outlet. The spout is arranged to direct a portion of the liquid from the inlet to the outlet. A cap is coupled to the spout and is rotatable between a first position and a second position. The cap includes a seal element positioned to form a seal between the cap and the spout, and a flow control member fixedly attached to the cap and sized to completely block the flow aperture when the cap is in the first position and to completely uncover the flow aperture when the cap is in the second position.

The invention relates to a filter unit (1, 19), having: at least one warp-knitted spacer (3) which comprises a first and a second cover layer (4; 5) having in each case a multiplicity of openings (6) which are delimited by peripheral regions (7), wherein threads (8) extend from the peripheral regions (7) of the first cover layer (4) to peripheral regions (7) of the second cover layer (5), and wherein the at least one warp-knitted spacer is rolled, twisted, and/or at least in one portion is compressed.

A module type aquaculture tank having a stepwise recirculating aquaculture system according to the present disclosure may include a main fish breeding water tank including first, second, third, and fourth edges and having a square plane, an intermediate fish breeding water tank disposed adjacent to the first edge of the main fish breeding water tank, a plurality of recirculating filtration tanks arranged adjacent to each other along the third edge opposite to the first edge of the main fish breeding water tank, and an air lifting Venturi apparatus including a plurality of Venturi pipes arranged along the edges of an inside of the main fish breeding water tank and an air guide obliquely extending from an upper end of each of the plurality of Venturi pipes upward in an air spray direction.

There is provided a system and method for managing fish migration in a body of water in the vicinity of an artificial or natural barrier. The system including a source of saturated water, where the saturated water is water having a dissolved gas level that is higher than that in the body of water. The system also includes outlets in fluid communication with the source of saturated water, each outlet being positioned at a predetermined position in the body of water to eject the saturated water into the predetermined position. The system further includes a pump in fluid communication with the source of saturated water and the outlets for moving the saturated water from the source to the one or more outlets, wherein flow of the saturated water into the body of water raises the dissolved gas level at the predetermined positions, thereby drawing the fish towards the predetermined positions.

A system includes a housing; a water tank positioned within the housing, wherein an inside of the water tank is sealed to prevent contact between material forming the water tank and water within the water tank; a water movement subsystem causing water to circulate within the water tank, including a baffle extending along the center of the water tank dividing the water tank into a circular raceway, and a pump causing water to circulate; an aeration subsystem maintaining an oxygenation level suitable for crustaceans to live within the water tank; a temperature control subsystem maintaining a water temperature suitable for crustaceans to live within the water tank; a water quality monitoring subsystem monitoring a water quality parameter of water within the water tank; a feeding subsystem configured to dispense food into the water tank; a biofloc removal subsystem configured to remove biofloc from the water tank; and a control system.

Exemplary embodiments relate to a water filter for an aquarium comprising a housing with an interior area configured to house a plurality of filtration cartridges, at least one first clamp and at least one second clamp, and a cover with a lid in operative movable+connection therewith. The cover includes a roughing filter chamber that is in operative fluid connection with the housing interior area and a first connection port that is in operative fluid connection with a water inlet, and a second connection port in operative fluid connection with a water outlet and the housing interior area. The first and second clamps are in operative connection with the housing and are releasably engageable with a rim extending around the cover and the lid. In a disengaged position of the second clamp, the lid is movable between open and closed positions while the cover is maintained in engagement with the housing.

A tank for farming of marine organisms is described, where the tank includes a main chamber to hold the marine organisms and where the tank has further chambers to treat the water before it is circulated back to the main chamber.