Method suitable for artificial breeding of CrassOstrea hongkongensis in sea area in north

Abstract

The invention discloses a method suitable for artificial breeding of CrassOstrea hongkongensis in a sea area in the north. The method suitable for artificial breeding of CrassOstrea hongkongensis in the sea area in the north is characterized by comprising the steps that firstly, CrassOstrea hongkongensis adult shellfish with a shell higher than 10 cm are selected, the CrassOstrea hongkongensis adult shellfish are placed in breeding ponds in high-temperature summer (July and August) with the density of 40-50 pieces / m<3> under the conditions that the water temperature ranges from 26 DEG C to 30 DEG C and the salinity ranges from 25 to 32, artificial oviposition and spermiation are conducted after the CrassOstrea hongkongensis adult shellfish are bred for 10 days to 15 days, spawn and sperms are placed in a breeding pond containing filtered sea water to be discharged naturally after being dried in the shade for five hours to eight hours, or the spawn and the sperms are obtained after the male shellfish and female shellfish are distinguished manually, and then artificial insemination is conducted; germ cells are hatched for 18 hours to 20 hours under the condition that the water temperature ranges from 26 DEG C to 32 DEG C so that D type larvas can be obtained, the D type larvas are placed in ponds to be bred with the density of 6-8 pieces / m<3>, when 50%-80% of the D type larvas become eyespot larvas after the D type larvas are hatched for 15 days to 18 days, oyster shell and cement block substrata are placed into the ponds, and juvenile mollusk is obtained after the eyespot larvas adheres to the oyster shell and cement block substrata for four days to six days; finally, the juvenile mollusk adhering to the oyster shell and cement block substrata is moved into outdoor ponds to be bred, the juvenile mollusk is transported to a sea area in the south to be bred in an overland mode at lower temperature after the juvenile mollusk is 5 mm-10 mm long. By the adoption of the method suitable for artificial breeding of CrassOstrea hongkongensis in the sea area in the north, the problems that the rate of fertilization for artificial breeding of the CrassOstrea hongkongensis in the south is low and the survival rate of the larvas is low are solved.

Description

technical field [0001] The invention relates to a method for producing seedlings of Hong Kong giant oyster, in particular to a method suitable for artificial breeding of Hong Kong giant oyster in the northern sea area. Background technique [0002] The Hong Kong giant oyster (CrassOstrea hongkongensis) is a high-temperature and low-salt species that inhabits near the estuary or near the place where fresh water is injected. It has a breeding history of more than 700 years. It is a unique economic shellfish in the southern sea area of ​​my country. It is white, and the mantle is mostly black. It has the characteristics of beautiful color and delicious meat. The market price is 1-2 times higher than other oysters such as long oysters, and its market prospect is broad. [0003] At present, my country's giant oyster seedlings from Hong Kong are mainly semi-artificially harvested, but wild seedlings are limited by seasons, and the output is unstable, which limits the development of...

AI Technical Summary

Problems solved by technology

[0006] The invention solves the problems of low fertilization rate, low larval survival rate and low attachment metamorphosis rate of giant oyster indoor artificial breeding in southern Hong Kong