A hand-held submersible aquarium power cleaner for cleaning debris from an aquarium, includes an elongated housing having an intake compartment and a filtering compartment therein. A nozzle is positioned at a front end of the housing and is in fluid communication with the intake compartment, wherein a selectively openable channel is provided between the intake compartment and the filter compartment. A filter is disposed in fluid communication with the filter compartment. A water pump assembly has an impeller rotatably connected to an electric motor, wherein the impeller is in fluid communication with the intake compartment. A power switch controls power to the electric motor so that rotation of the impeller draws aquarium water and debris through the nozzle and into the filtering compartment, where the debris is captured and retained by the filter and cleansed water is discharged into the aquarium.

A hand-held submersible aquarium power cleaner for cleaning debris from an aquarium, includes an elongated housing having an intake compartment and a filtering compartment therein. A nozzle is positioned at a front end of the housing and is in fluid communication with the intake compartment, wherein a selectively openable channel is provided between the intake compartment and the filter compartment. A filter is disposed in fluid communication with the filter compartment. A water pump assembly has an impeller rotatably connected to an electric motor, wherein the impeller is in fluid communication with the intake compartment. A power switch controls power to the electric motor so that rotation of the impeller draws aquarium water and debris through the nozzle and into the filtering compartment, where the debris is captured and retained by the filter and cleansed water is discharged into the aquarium.

A device (1) for separating segments (2) in a tank. The tank system includes a circular tank system with water flow for the farming of fish, said device being movable and comprising a plurality of preferably two element units, which are joined so as to form a V-shape seen from above. Further, the invention comprises the use of the device for the farming of edible fish.

A device (1) for separating segments (2) in a tank. The tank system includes a circular tank system with water flow for the farming of fish, said device being movable and comprising a plurality of preferably two element units, which are joined so as to form a V-shape seen from above. Further, the invention comprises the use of the device for the farming of edible fish.

Disclosed is an effluent switching device which includes a water outlet base disposed at an outlet end of a suction pipe and a rotating mechanism inserted into the water outlet base. A water outlet is defined in the rotating mechanism. When the rotating mechanism is moved to a first position relative to the water outlet base, the water outlet communicates with the suction pipe to define a first water outlet channel; and when the rotating mechanism is moved to a second position relative to the water outlet base, the water outlet communicates with the suction pipe to define a second water outlet channel. When the effluent switching device is installed on the suction pipe of a water pump, the water outlet base and the rotating mechanism can work in conjunction to adjust a position of the rotating mechanism, achieving the purpose of switching between the first water outlet channel and the second water outlet channel.

Disclosed is an effluent switching device which includes a water outlet base disposed at an outlet end of a suction pipe and a rotating mechanism inserted into the water outlet base. A water outlet is defined in the rotating mechanism. When the rotating mechanism is moved to a first position relative to the water outlet base, the water outlet communicates with the suction pipe to define a first water outlet channel; and when the rotating mechanism is moved to a second position relative to the water outlet base, the water outlet communicates with the suction pipe to define a second water outlet channel. When the effluent switching device is installed on the suction pipe of a water pump, the water outlet base and the rotating mechanism can work in conjunction to adjust a position of the rotating mechanism, achieving the purpose of switching between the first water outlet channel and the second water outlet channel.

An aquarium cleaning device includes an isolation zone forming member having opposing first and second sides. First and second liquid passages are formed through the member between the first and second sides, each of the first and second liquid passages having an opening on the second side. A gasket is secured to the isolation zone forming member and forms a loop around the openings of the first and second liquid passages. The gasket is disposed to create sealing contact against an aquarium wall when the isolation zone forming member is held against the aquarium wall. An input tube is fluidically connected to the first liquid passage and an output tube is fluidically connected to the second liquid passage.

An aquarium cleaning device includes an isolation zone forming member having opposing first and second sides. First and second liquid passages are formed through the member between the first and second sides, each of the first and second liquid passages having an opening on the second side. A gasket is secured to the isolation zone forming member and forms a loop around the openings of the first and second liquid passages. The gasket is disposed to create sealing contact against an aquarium wall when the isolation zone forming member is held against the aquarium wall. An input tube is fluidically connected to the first liquid passage and an output tube is fluidically connected to the second liquid passage.

Provided is a method for artificial rearing of porcupine pufferfish fries in indoor cement ponds. The method includes the following steps: indoor cement pond preparation, release hatched larvae into the indoor cement pond, feed and manage the larvae at different sub-stages of the fry rearing stages, water quality management during fry rearing, separate ponding of fries based on size of the fries, and transfer the fries to net cages or outdoor ponds when the fries reach a minimum length. The indoor cement pond preparation step may include disinfecting the pond and regulating the water quality. During the rearing stage, the method may include stimulating anti-stress physiological response of the larvae. The method may transfer fries with an average total length of more than 2.0 cm into net cages or outdoor ponds for aquaculture after 45 days of the rearing stage.

Provided is a method for artificial rearing of porcupine pufferfish fries in indoor cement ponds. The method includes the following steps: indoor cement pond preparation, release hatched larvae into the indoor cement pond, feed and manage the larvae at different sub-stages of the fry rearing stages, water quality management during fry rearing, separate ponding of fries based on size of the fries, and transfer the fries to net cages or outdoor ponds when the fries reach a minimum length. The indoor cement pond preparation step may include disinfecting the pond and regulating the water quality. During the rearing stage, the method may include stimulating anti-stress physiological response of the larvae. The method may transfer fries with an average total length of more than 2.0 cm into net cages or outdoor ponds for aquaculture after 45 days of the rearing stage.