Drifting roe hatching method and hatching device

Abstract

The invention discloses a drifting roe hatching device. The drifting roe hatching device comprises a cylindrical barrel and a contraction barrel located below the cylindrical barrel, wherein the top of the contraction barrel communicates with the cylindrical barrel; the bottom area of the contraction barrel is smaller than the top area of the contraction barrel; and the cylindrical barrel is composed of an upper edge fixing ring, a lower edge fixing ring and a first annular gauze surrounding the two fixing rings. The contraction barrel is composed of a contraction fixing ring located below thecontraction cylinder and a second annular gauze for surrounding the contraction fixing ring and the lower edge fixing ring; and the diameter of the contraction fixing ring is smaller than that of thelower edge fixing ring. By the adoption of the drifting roe hatching method and hatching device, the flushing flow can be adjusted according to different drifting roes, so that the optimal effect isachieved, and the survival rate of the roes is increased; and the hatching device is simple in manufacturing process, low in manufacturing cost and convenient to carry.

Description

technical field [0001] The invention belongs to the field of animal breeding, and relates to fish egg hatching technology, in particular to a drifting fish egg hatching method and a hatching device. Background technique [0002] In the process of fish reproduction, hatching of fish fertilized eggs is an extremely critical technical link. The hatching rate directly determines the quantity and quality of newly hatched larvae, and also has a certain impact on later seedling cultivation. Drifting fish eggs need certain dissolved oxygen and water temperature conditions to naturally germinate, and the dissolved oxygen content in the water body is related to the flow rate of the water. If the flow rate is too low, the eggs will easily sink to the bottom and die. At present, there are mainly two ways to hatch floating fish eggs: one is hatching by flushing water in the cement pool ring; the other is hatching in hatching buckets. [0003] Cement annular tank hatching is an ideal imi...

AI Technical Summary

Problems solved by technology

[0003] Cement annular tank hatching is an ideal imitation natural hatching method. It has the advantages of large capacity, controllable flow rate, convenient operation, and long service life. The disadvantages are high cost, large land occupation and cannot meet the needs of field work.

The hatching tank is currently the most used incubator in the breeding and releasing stations. Its advantages are convenient group management and simple operation; the disadvantage is that the flow control of the hatching tank cannot meet the demand for the flow rate of fish eggs, and it is easy to form a dead angle in the tank to cause fertilization. Egg accumulation and egg membrane damage, resulting in loss of fertilized eggs

[0004] Therefore, there is currently a need for a hatching method that can keep fish eggs in a uniform suspension state throughout the hatching process, and solve the problem of high oxygen consumption and easy damage of drifting fish eggs

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