In-vitro hatching device for cherax quadricarinatus

Abstract

The invention relate to an in-vitro hatching device for cherax quadricarinatus, which comprises a hatching tank, a water storage tank and a water storage barrel, wherein the hatching tank and the water storage tank are of rectangular parallelepiped structures; the hatching tank comprises a top frame, two opposite side walls and a plurality of cross bars which are arranged between the two side walls at parallel intervals; a plurality of hatching boxes are erected between every two cross bars, and the box body of each hatching box is a net structure; the hatching tank and the water storage tankare nested, and the depth of the hatching tank is smaller than that of the water storage tank; the low part of the hatching box is immersed in a water body in the water storage tank; a water dischargeopening is arranged at the bottom of one end of the water storage tank and communicated with the water storage barrel; and the bottom of the water storage barrel is provided with a water outlet, andthe water outlet supplies water into the water storage tank from the other end opposite to the water discharge opening of the water storage tank through a first water pump. The in-vitro hatching device can effectively carry out basic disease control, gene control, quantity control in a hatching process and has a high hatching rate.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to an in vitro hatching device for red-clawed crayfish. Background technique [0002] At present, the artificial breeding of red claw crayfish adopts the traditional method, that is, the female shrimps hold eggs and hatch them, and the female shrimps holding eggs are isolated and put into the spawning pool. As the color of the eggs gradually deepens, appendages appear in the eyes, and finally the juvenile shrimps leave. The parent body, the traditional method has the following problems and shortcomings: [0003] 1. The water quality cannot be controlled. During the hatching period, it is affected by changes in water quality due to changes in external factors, such as water temperature. In the appropriate water temperature range, the higher the temperature, the shorter the incubation time. In case of low temperature, when the water temperature is as low as 20°C, the range of ch...

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Problems solved by technology

[0004] 2. Unable to control the disease

Fertilized eggs are in the same environment as the mother during the hatching period, and are very susceptible to infection with bacteria, viruses, parasites, etc. carried by the mother. At the same time, they are also threatened by various bacteria, viruses, parasites and other pathogens in the water, resulting in unhealthy shrimp seedlings. , prone to disease in the process of shrimp seedling cultivation and adult shrimp cultivation, and the survival rate is not high

[0005] 3. Cannot control genes

The gene of shrimp seedlings is unknown, and inbreeding cannot be avoided when parents are selected after sexual maturity, resulting in continuous degeneration of offspring

[0006] 4. It is impossible to accurately know the number of hatched shrimp, and it is impossible to know the breeding density, and the size and specification of the shrimp cannot be unified. In the later stage, it is necessary to continuously raise them in separate ponds, which consumes a lot of manpower and material resources. Due to the unknown number of shrimp, the feed is insufficient. , Shrimp grow slowly, or overfeed, waste feed increases costs, pollutes water quality, and cannot predict production volume

[0007] 5. Low hatch rate

Due to the interference of various external environmental factors during the incubation process, the hatching rate of the traditional method is low, generally not more than 30%.

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