Hatching device and method for demersal spawns of marine fishes

Abstract

The invention relates to a hatching device and method for demersal spawns of marine fishes. The hatching device comprises a net cage, a water channel, a bracket, a temperature controller indicator, a probe, a heating rod, a water inlet hose, a sinker, an air inlet hose, an air stone and an annular water injector, wherein the net cage and the bracket are located in the water channel; the net cage is bound on the bracket; the water inlet hose and the air inlet hose are located in the water channel outside the net cage; the upside of the net cage is provided with the annular water injector; and the probe and the heating rod are arranged in the water channel. The hatching method comprises the following steps of: controlling a hatching condition; hatching; carrying out microscopic examination observation; carrying out secondary water temperature controlling; managing routinely; collecting larva fish and the like. The hatching method has the advantages that spawn deposition is avoided because of conical point inflation; spawns adhered on net cage edges are washed at any time by the annular water injector; the net cage is conveniently replaced; the water temperature is stably controlled by an electric temperature controller; and the fresh water quality can be ensured due to water feeding and drainage modes of water feeding of the annular water injector at the upside and water feeding of the water channel at the bottom and overflowing of the periphery of the water channel. Therefore, by means of the hatching device and method, a hatching rate of the demersal spawns of the marine fishes in the industrial fry breeding is improved.

Description

Technical field: [0001] The invention belongs to the large-scale seed breeding technology of seawater fish, in particular to a hatching device and a hatching method for increasing the hatching rate of submerged fertilized eggs of seawater fish in industrialized seedling breeding. technical background: [0002] With the development of marine fish farming industry, people have more and more demand for artificial seedlings of various fishes. The supply of seedlings directly affects the industrialization of aquaculture, and the hatching rate determines the number of larvae. Therefore, it directly affects the success or failure of large-scale seed breeding. Fish egg hatching technology is one of the key technologies in the large-scale seed breeding technology of seawater fish. So far, some fishes (such as conger eels) still rely on seedlings caught in natural waters to supply the aquaculture industry because they have not broken through the artificial breeding technology, making ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a hatching device and a specific hatching method that conform to the characteristics of sinking eggs of seawater fish, have a reasonable structure and layout, and are simple and easy to manufacture and install; Accumulation at the bottom, dead corners in the hatching device; unstable water temperature, etc. lead to low hatching rate; some fish eggs are easy to adhere to the cage; it is inconvenient to replace the cage during the hatching process, and the long time will cause the cage to be polluted, which will lead to environmental deterioration, fish Oxygen deficiency and easy damage to fish eggs and other problems

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