A experimental device is specifically an annular water tank formed by a first arc-shaped water tank, a first special-shaped water tank, a second arc-shaped water tank and a second special-shaped water tank which are sequentially connected head to tail, and the outer perimeter is 70 m to 110 m, wherein the inner walls of both the first special-shaped water tank and the second special-shaped water tank are flat, both of the widths between the outer walls and the inner walls are gradually increased from the two ends to the middle, and water flow pushing equipment which are capable of enabling the maximum water flow velocity in the experimental device to reach a preset value are respectively placed in the first special-shaped water tank and the second special-shaped water tank.

A tray system suitable for use with fish laying eggs in skeins provides a set of cassettes having opposed water-permeable faces that may clamp about the edges of the skeins to prevent them from coiling about themselves while exposing both sides of the skeins to flowing water. A regular form factor of the cassettes allows them to be closely stacked with small water flow gaps between them for high hatching density.

A tray system suitable for use with fish laying eggs in skeins provides a set of cassettes having opposed water-permeable faces that may clamp about the edges of the skeins to prevent them from coiling about themselves while exposing both sides of the skeins to flowing water. A regular form factor of the cassettes allows them to be closely stacked with small water flow gaps between them for high hatching density.

The invention relates to a composition comprising a mixture of at least one strain of a bacterium of the genus Bacillus and at least one strain of lactic acid bacterium for use in the prevention of infections in farmed oviparous animals.

The invention relates to a composition comprising a mixture of at least one strain of a bacterium of the genus Bacillus and at least one strain of lactic acid bacterium for use in the prevention of infections in farmed oviparous animals.

A experimental device is specifically an annular water tank formed by a first arc-shaped water tank, a first special-shaped water tank, a second arc-shaped water tank and a second special-shaped water tank which are sequentially connected head to tail, and the outer perimeter is 70 m to 110 m, wherein the inner walls of both the first special-shaped water tank and the second special-shaped water tank are flat, both of the widths between the outer walls and the inner walls are gradually increased from the two ends to the middle, and water flow pushing equipment which are capable of enabling the maximum water flow velocity in the experimental device to reach a preset value are respectively placed in the first special-shaped water tank and the second special-shaped water tank.

A experimental device is specifically an annular water tank formed by a first arc-shaped water tank, a first special-shaped water tank, a second arc-shaped water tank and a second special-shaped water tank which are sequentially connected head to tail, and the outer perimeter is 70 m to 110 m, wherein the inner walls of both the first special-shaped water tank and the second special-shaped water tank are flat, both of the widths between the outer walls and the inner walls are gradually increased from the two ends to the middle, and water flow pushing equipment which are capable of enabling the maximum water flow velocity in the experimental device to reach a preset value are respectively placed in the first special-shaped water tank and the second special-shaped water tank.

A process for harvesting fish eggs is provided, in particular fish eggs from Salmon. The process comprises rearing sexually immature salmon in an aquatic environment in stages during which at least the light exposure and time span is adjusted. The rearing includes at least a winter-summer period that comprises a winter life-cycle stage, within which the broodstock is exposed to light that simulates winter light exposure, and a subsequent summer life-cycle stage, within which the broodstock is exposed to light that simulates summer light exposure, wherein the total Accumulated Thermal Unit (ATU) during the winter-summer period is no more than 5000. The inventions also provides salmon eggs that are produced by the disclosed process.

A fish egg incubator including a housing containing a reciprocating mechanism, at least one connector assembly associated with the reciprocating mechanism, at least one perforated containing assembly for holding the fish eggs located at least partially below a water surface and which is associated with the connector assembly where in the reciprocating mechanism periodically moves the least one perforated containing assembly in the water in order to move the eggs in the at least one perforated containing assembly.

A fish egg incubator including a housing containing a reciprocating mechanism, at least one connector assembly associated with the reciprocating mechanism, at least one perforated containing assembly for holding the fish eggs located at least partially below a water surface and which is associated with the connector assembly where in the reciprocating mechanism periodically moves the least one perforated containing assembly in the water in order to move the eggs in the at least one perforated containing assembly.