A watercraft for breeding aquatic organisms, including an aquaculture facility and a device for feeding water into the aquaculture facility so that water intended to be fed into the aquaculture facility can escape from a body of water in which the watercraft is floating. A feed opening for receiving the water from the body of water is open in the longitudinal direction of the watercraft and/or is arranged below a water line of the watercraft. The feed opening is arranged on the hull of the watercraft, preferably on the bow. The watercraft includes a device for letting out water from the aquaculture facility to the body of water. An outlet opening of the outlet device is open in the longitudinal direction of the watercraft and/or is arranged below the water line of the watercraft. The outlet opening preferably being arranged on the hull of the watercraft, on the bow thereof.

An aquarium filter assembly includes a transfer tube to convey aquarium liquid and a pre-filter member secured to an end of the transfer tube. The pre-filter member may include a rigid porous media basket, or it may include a micron filter of pleated media.

An impeller for use in an aquarium filter pump includes a shaft and a plurality of impeller blades radially extending from the shaft. Each of the impeller blades includes opposite blade faces. A depression is in each of the blade faces and aids in pushing the water. The depression can be a variety of shapes and can have its deepest portion along one of the edges of the blade.

A cage is for farming fish. The cage floats in a water column and the upper portion of the cage has a surrounding floating body arranged to float in a water surface. An enclosure is located between the upper portion and the lower portion of the cage, the enclosure being closed in its lower portion and forming an inside and an outside. The cage has a liquid-tight wall which is attached to the floating body and which extends from the water surface downwards in the water column. The liquid-tight wall forms a lower edge portion. The cage is provided, in its upper portion, with at least one flow booster for creating a circular water current within the liquid-tight wall. A method for creating an upward water current of fresh water within the cage is also provided.

A cage is for farming fish. The cage floats in a water column and the upper portion of the cage has a surrounding floating body arranged to float in a water surface. An enclosure is located between the upper portion and the lower portion of the cage, the enclosure being closed in its lower portion and forming an inside and an outside. The cage has a liquid-tight wall which is attached to the floating body and which extends from the water surface downwards in the water column. The liquid-tight wall forms a lower edge portion. The cage is provided, in its upper portion, with at least one flow booster for creating a circular water current within the liquid-tight wall. A method for creating an upward water current of fresh water within the cage is also provided.

The present disclosure provides systems and processes for recycling biogenic CO.sub.2. A system includes an aquacultural reservoir (102) configured to contain water (108) and aquatic animals (110) that live therein; a separation stage (104) in fluid communication with the aquacultural reservoir, wherein the separation stage is configured to receive water from the aquacultural reservoir and separate biogenic CO.sub.2 gas (114) from the water; and a fermentation tank (106) in gas communication with the separation stage, wherein the fermentation tank is configured to receive and convert the biogenic CO.sub.2 into biomass (126) by fermentation. The produced biomass can be used to cultivate the aquatic animals in the aquacultural reservoir.

The present disclosure provides systems and processes for recycling biogenic CO.sub.2. A system includes an aquacultural reservoir (102) configured to contain water (108) and aquatic animals (110) that live therein; a separation stage (104) in fluid communication with the aquacultural reservoir, wherein the separation stage is configured to receive water from the aquacultural reservoir and separate biogenic CO.sub.2 gas (114) from the water; and a fermentation tank (106) in gas communication with the separation stage, wherein the fermentation tank is configured to receive and convert the biogenic CO.sub.2 into biomass (126) by fermentation. The produced biomass can be used to cultivate the aquatic animals in the aquacultural reservoir.

Apparatus and associated methods relate to an environmental control system including a fluid driver configured to releasably couple to a buoyant module. In an illustrative example, in a deployment mode, the fluid driver may be brought into register with and releasably coupled to the buoyant module. The fluid driver, for example, be supported by the buoyant module in a body of water. A control unit may, for example, selectively provide energy to the fluid driver such that the fluid driver induces fluid to flow from the body of fluid to a reservoir by a conduit. The control unit may be configured to mechanically support the fluid driver in a stowage mode. Various embodiments may advantageously allow a user to selectively deploy a livewell environment control from a stowed mode into a deployed mode.

A method of monitoring water tank includes receiving a temperature data set, a water conductivity data set, and a water level data set, characterizing measurements of a plurality of characteristic properties of water within a water tank by a sensor operatively arranged within the water tank. The method further includes determining a first rule characterizing environmental requirements of the water arranged within the water tank. The method further includes generating an output data set based on the received data sets and the first rule. The method further includes providing the generated output data set. Related apparatus, systems, techniques, and articles are also described.

A method of monitoring water tank includes receiving a temperature data set, a water conductivity data set, and a water level data set, characterizing measurements of a plurality of characteristic properties of water within a water tank by a sensor operatively arranged within the water tank. The method further includes determining a first rule characterizing environmental requirements of the water arranged within the water tank. The method further includes generating an output data set based on the received data sets and the first rule. The method further includes providing the generated output data set. Related apparatus, systems, techniques, and articles are also described.