Parent fish breeding and hatching method for greenlings

Abstract

The invention relates to a parent fish breeding and hatching method for greenlings, belonging to the technical field of fish breeding and hatching. The parent fish breeding and hatching method for greenlings is characterized by comprising the following factors of parent fish selecting time and standard, breeding pond and stocking density, water temperature control, bait feeding, illumination control, egg taking for insemination, and hatch. In the parent fish breeding and hatching method for greenlings, grown maturity-approaching parent fish is enabled to be mature in advance by adopting the breeding measures of manually controlling temperature and light, adjusting bait and water quality, and the like; the parent fish bred by the method can be mature for 15 to 20 days earlier than that in a natural sea area; the mature rate of the parent fish reaches more than 70 percent, and the hatching rate of eggs reaches 85-90 percent, which are shown in the figure II (hatch-approaching eyed eggs); and in the clustered hatched egg blocks, a plurality of eggs are yellowed and are dead, and the hatching rate is low (shown in the figure III). By being used for manual breeding, the method is favorable for protecting natural resources, reducing energy consumption caused by heating during breeding, and changing the shapes of the egg blocks so as to increases the water contact area of the egg blocks and improve the hatching condition and the hatching rate.

Description

technical field [0001] The invention relates to a method for cultivating and hatching hexaline broodstock, and belongs to the technical field of fish cultivating and hatching. Background technique [0002] Hexagrammos otakii Jordan and Starks, commonly known as yellow croaker, belongs to Scorpaeniformes, family Hexagrammidae, and is distributed in the Yellow Sea, Bohai Sea, Japan, North Korea and the Russian Far East seas. Hexaline fish is a resident fish in coastal shallow seas, with low temperature resistance, strong adaptability, and tender meat. It is known as "northern grouper" and is an ideal species for cage culture in the north. With the development of deep-sea cage fish culture in China, the supply of suitable seed is in short supply. At present, Jiangsu, Shandong, Liaoning, Hebei and other provinces have successively carried out the artificial breeding of hexaline carp. In the coastal waters of the Shandong Peninsula and the Liaodong Peninsula, the spawning period...

AI Technical Summary

Problems solved by technology

This process firstly destroys natural resources, and secondly, after the egg mass loses the natural hydrological conditions, due to poor water exchange conditions, the hatching rate of eggs inside the egg mass is very low (about 30%), and the survival rate of hatched larvae is also very low

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