Method for solen grandis spat rearing

Abstract

The invention relates to the field of solen grandis spat rearing, in particular to a method for solen grandis spat rearing. In the aspect of a water pretreatment method for spat rearing, biological secondary purification is conducted on seawater obtained after sand filtration by using ruditapes variegate, toxic and harmful substances in the seawater can be further removed, and a good water quality condition is provided for the production of spat. In the aspect of an oviposition method, an oviposition barrel is used for oviposition, movable operation of the parent shellfish is achieved, and the problems that the oviposition density of the solen grandis is too large and the number of sperms is too large, and accordingly egg membrane dissolution or fertilized egg development malformation is caused can be solved. In the aspect of a fertilized egg hatching method, a method for hatching fertilized eggs in an original oviposition pond is used, so that the problems that the fertilized eggs are damaged due to water flow impact, friction and extrusion in the fertilized egg collection process, the fertilized eggs cannot be completely collected, and waste is caused are solved. In the aspect of selection and application of adhering substrates, the two materials including sea mud and fine sand serve as the adhering substrates in different juvenile shellfish stages, harmful organisms are removed easily, and the growth speed and the survival rate of juvenile shellfishes are increased.

Description

technical field [0001] The invention relates to the field of raising razor clam seedlings, in particular to a method for cultivating razor clam seedlings. Background technique [0002] Solen grandis belongs to the mollusk phylum, bivalves, razor clam family, and genus razor clam. It is widely distributed in the north and south coasts of my country, and inhabits the middle and low tide areas of the intertidal zone and the sand in the shallow sea. Incognito life. Razor razor clam has delicious meat and rich nutrition. It is an important breeding species in tidal flats and shallow seas in my country, and has high economic value. [0003] In the artificial breeding of razor clams, due to the lack of knowledge about the pretreatment of seedling water, the characteristics of reproduction, and the living habits of juvenile shellfish, it is difficult to effectively eliminate the water dissolved in the water by only using a relatively simple sand filtration method in the pre-treatmen...

AI Technical Summary

Problems solved by technology

[0003] In the artificial breeding of razor clams, due to the lack of knowledge about the pretreatment of seedling water, the characteristics of reproduction, and the living habits of juvenile shellfish, it is difficult to effectively eliminate the water dissolved in the water by only using a relatively simple sand filtration method in the pre-treatment of seedling water. Toxic and harmful substances; in terms of spawning and hatching of fertilized eggs, cement ponds are used to spread sand and lay eggs, and fertilized eggs are collected and moved to ponds for hatching. The spawning density is difficult to control, and the egg lysis and deformity are caused by too many sperm Occasionally, fertilized eggs were severely damaged and incompletely collected, resulting in low utilization rate and hatching rate of fertilized eggs. The utilization rate of fertilized eggs was only 40-50%, and the hatching rate was only 40-60%. The overall hatching rate of D-type larvae is only 16-30%.

In terms of spat cultivation, the single choice of sand as the attachment base is not conducive to the latent life of early spat, and is not convenient for the removal of harmful organisms.

The existence of the above-mentioned problems has caused the utilization rate and hatching rate of the fertilized eggs of razor clams to be low, affecting the growth rate and survival rate of juvenile shellfish and the success rate and stability of artificial seedling production

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