A large-scale artificial hatching method for eel fertilized eggs

Abstract

The invention belongs to the field of aquaculture, in particular to a large-scale artificial hatching method of fertilized ovums of rice-field eels. The large-scale artificial hatching method is characterized in that the artificial hatchability can be improved to above 90%, and a technical system can be provided for an imitative ecological large-scale breeding by taking neural embryos as artificial hatching starting points, applying special hatching facilities, and continuous dripping for oxygenation and other methods. The large-scale artificial hatching method comprises the following steps: 1) building special hatching facilities, and installing a water storage tank, a hatching tank and a dripping facility sequentially according to a high position difference; 2) adopting an imitative ecological breeding method to obtain the fertilized ovums of the ricefield eels, transferring the fertilized ovums to a hatching box to hatch when the fertilized ovums naturally develop to a neural embryonic period in a foam nest; 3) paving the neural embryos in the hatching box, keeping the embryos 1cm far away from the water surface, and promoting the neural embryos to develop by adopting a dripping method for oxygenation; and 4) continuously leaving baby eels to cultivate in the hatching box temporarily after the baby eels come out of membranes, feeding until the eels is 5cm long through opening and tamping and then transferring the eels to a net cage or other facilities to continuously feed.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and in particular relates to a large-scale artificial hatching method for eel fertilized eggs. Background technique [0002] Rice field eel is a famous and high-quality aquatic product, which is deeply loved by consumers. At present, there are three main breeding methods of ricefield eels: natural breeding, artificial breeding and imitation ecological breeding. The first is natural breeding, which requires a large area of ​​land and a long breeding season, and it is difficult to separate parental eels and eel seedlings, so it is not convenient for large-scale mass production; the second is full-artificial breeding of rice field eels. In the process of induced labor, eels are prone to death and the fertilization rate is low. Judging from the current research progress, the problem of artificial induced labor is difficult to overcome in a short period of time, so it is impossible to carry out l...

AI Technical Summary

Problems solved by technology

The first is natural breeding, which requires a large area of ​​land and a long breeding season, and it is difficult to separate parental eels and eel seedlings, so it is not convenient for large-scale mass production; the second is full-artificial breeding of rice field eels. In the process of induced labor, eels are prone to death and the fertilization rate is low. Judging from the current research progress, the problem of artificial induced labor is difficult to overcome in a short period of time, so it is impossible to carry out large-scale mass production; Mainly by artificially simulating an ecological environment suitable for the growth and reproduction of rice field eels, breeding in cages is the most feasible breeding mode at present because of its fixed breeding place, convenient egg collection, and high natural fertilization rate.

There are many studies on the artificial incubation of rice field eel fertilized eggs, but the hatching rate is very low, generally no more than 30%.

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