General hatching method for semi-submersible sticky fish eggs

Abstract

The invention discloses a semi-submersible viscous roe universal incubation method which comprises the following steps: (1) roe preparation; (2) adhering of the roes to incubation meshes: putting an incubation device in the water of a pool in a semi-submersible manner; spreading the fertilized viscous roes to the water surface by one person, and horizontally shaking the incubation device left and right by another person so that the roes are dispersed and uniformly adhered to the incubation meshes of the incubation device; (3) hanging of the incubation meshes: taking the incubation meshes with uniformly adhered viscous roes out of the incubation device, and vertically hanging the incubation meshes in order on a hanging rope in the water; and (4) incubation management: performing aeration oxygenation of the water in the pool, controlling the water temperature to 18-25 DEG C, and changing the water once every 3-5 hours. The incubation method disclosed by the invention is simple, and the adopted incubation device has a simple and practical structure and is convenient to carry; and moreover, the distribution uniformity of the incubated roes can be effectively increased, the hypoxia death caused by roe overlapping is avoided, the harm to the roes caused by common saprolegniasis in the incubation process can be reduced, and the incubation rate of the roes is further increased.

Description

technical field [0001] The invention relates to the technical field of fish artificial reproduction devices, in particular to a semi-submersible sticky fish egg universal hatching method and device. Background technique [0002] During the hatching process of fertilized fish eggs, sinking fish eggs accumulate at the bottom of the water due to their large specific gravity, and they are squeezed against each other, which is very easy to cause damage. Low, high deformity rate of larvae and other problems. The existing hatching method is to directly sprinkle the fertilized sticky fish eggs on attachments such as palm leaves, nets or the bottom of the pool in the water, allowing them to naturally adhere and hatch directly. The formal way is to use hatching boxes or hatching tanks, etc., only relying on methods such as increasing the number of aeration stones and reducing the hatching density can not really solve the problem of fish egg accumulation. On the other hand, the hatchi...

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Problems solved by technology

The formal way is to use hatching boxes or hatching tanks, etc., only relying on methods such as increasing the number of aeration stones and reducing the hatching density can not really solve the problem of fish egg accumulation. On the other hand, the hatching equipment and facilities are large in size and occupy a large area , high water consumption, complex operation, high difficulty, low hatching efficiency, greatly restricting the success rate of sinking fish eggs hatching

The commonly used incubator / cabinet in recent years adopts the method of reducing the hatching density of fish eggs, which alleviates the problem of insufficient dissolved oxygen of fish eggs to a certain extent, but it is bulky, occupies a large area, is difficult to operate, and is expensive. Meet the needs of ordinary nursery farms

[0003] However, the prior art has the following disadvantages: the one is that the eggs adhered to the attachments are unevenly distributed, and they are easy to gather and adhere to cause anoxic death, and after the breeding of water mold, a large area of ​​eggs will die; the other is that fish eggs The space utilization rate of the hatching water body is not high, which will easily lead to the deterioration of the water quality and lack of oxygen in the local water body, and then cause the failure of artificial hatching; the third is that the hatching rate of fish eggs is unstable, which is not conducive to the continuous large-scale production of fry and effectively reduce production costs

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