Egg washing method capable of effectively improving hatching rate of fertilized eggs of aquatic animals and device

Abstract

The invention discloses an egg washing method capable of effectively improving a hatching rate of fertilized eggs of aquatic animals and a device. Secondary bubble-containing water with a pressure of0.3 Mpa-0.4 Mpa, a bubble diameter of 1 micron-5 microns and a volume ratio of bubbles to water of 2-3:1 is adopted to flow to the bottom of a hatching pond and form an air curtain composed of fine bubbles through a spray pipe, in the process that the air curtain rises from the bottom of the hatching pond, free sperms in water, sperms gathered around the fertilized eggs, excrement and the like aresucked on the fine bubbles by utilizing the high surface area of the fine bubbles, the fine bubbles are continuously broken on the water surface to form a large amount of foam, and the foam is fishedout by using a net with 60 meshes-80 meshes. The used device is simple, the operation is convenient, the damage to a fertilization membrane can be reduced (5% or below), an egg washing speed is high,redundant sperms can be cleared immediately after the first several batches of ovulation and fertilization, the hatchability of the fertilized eggs is improved (80% or above), and the breeding quality of varieties is guaranteed.

Description

technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to an egg washing method and equipment which can effectively improve the hatching rate of fertilized eggs of aquatic animals. Background technique [0002] Gulf scallops, Philippine clams, japonicus and sea urchins are the main species of mariculture in my country. Gulf scallops are hermaphroditic, while sea cucumbers, sea urchins, and Philippine clams are difficult to distinguish between male and female. When inducing labor, only male and female individuals can give birth in the same pond Egg ovulation, the ratio of sperm to egg cannot be controlled artificially, too much sperm will gather around the fertilized egg, resulting in a low hatching rate of the fertilized egg. Taking bay scallop as an example, the hatching rate of the first 1-3 batches of high-quality eggs released by gonad-mature seed shells is very low (less than 10%) due to excessive sperm count, and the egg qual...

AI Technical Summary

Problems solved by technology

However, due to the large diameter of the produced air bubbles, it is difficult for the sperm around the fertilized eggs to be washed away by the air bubbles, and the hatching rate cannot be effectively improved.

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