Intermediate net-cage culturing process of artifical pearl shell fry

Abstract

The intermediate net-cage culturing process of artificial pearl shell fry includes setting floated net cage with net coating inside gulf sea area, covering with two layers of shading net in 95 % transmittance, attaching pearl shell fry onto transverse rope, replacing net coating and collecting fallen live fry and culturing the pearl shell fry to 25-30 mm size. The present invention has high survival rate.

Description

Technical field [0001] The invention belongs to aquaculture, in particular to a method for cultivating an artificial seedling cage of Pinctada chinensis. Background technique [0002] Mother-of-pearl [Pinctada margaritfera (linne)], commonly known as black butterfly oyster, is currently the only pearl oyster capable of mass production of black pearls. It has thick shells and can be used to make shell carvings and handicrafts with high economic value. Pearl oyster inhabits tropical and subtropical sea areas, mainly in the Tahiti, Cook, and Tuamotu Islands in the South Pacific. It is distributed along the coasts of China’s Hainan Province, Guangdong Province, Guangxi District, and Taiwan Province. Most of them inhabit It is brought to the bottom of the sea with a depth of tens of meters under the tide. [0003] The current situation of pearl oyster culture: black pearls are large, with a particle size of more than 1 cm, thick bead layer, good luster, large market demand, and expens...

AI Technical Summary

Problems solved by technology

In 2002, Guangdong Ocean University set up a scientific research team to carry out the research on full-artificial breeding and pearl breeding, and achieved success in large-scale production of artificial seedlings, batch breeding of large and medium-sized shellfish, and planting nuclei. However, small shellfish with a shell height of 3-25 mm The low survival rate makes black pearls unable to be produced on a large scale

[0004] Analysis of the reasons for the low survival rate of the artificial seedlings of pinnacle oyster: 1. Serious offshore pollution

In the 1990s, marine aquaculture was vigorously developed. Hundreds of thousands of acres of high-level shrimp ponds were added to the coast, tens of thousands of net cages were added to fish culture in harbors, and the area of ​​pearl culture in shallow seas increased several times. In recent years, large-scale scallops have also been added. Longline suspension farming is characterized by high density, high output, high input, and high pollution. Due to the lack of unified planning and development and utilization of tidal flats, harbors, and shallow seas, ignoring long-term ecological and environmental benefits, resulting in poor ocean currents and coastal waters in inner bays. Low exchange rate with open sea water results in poor water quality in aquaculture sea areas, intensified seabed sedimentation, shallower and narrower harbors; 2. Subtrophic seawater, increased attachments, and high chemical oxygen consumption; 3. Pearl oyster is an open sea shellfish , inadaptability to offshore areas; 4. At present, the broodstock for artificial breeding are all wild shellfish, and their offspring are not adaptable to the breeding environment, density and breeding methods, etc.

Its disadvantages are as follows: 1. When the shellfish is washed off from the attachment, it is easy to damage the silk gland or damage the shell, causing infection and death; 2. The dead body stays in the cage to infect other shellfish and destroy the water quality; 3. The net mesh Small, with many attachments, affecting the exchange of seawater inside and outside the cage, resulting in less bait organisms and low dissolved oxygen in the cage, which is not conducive to the growth of shellfish seedlings and a large number of deaths due to lack of oxygen; 4. The shellfish seedlings in the cage are attached to each other, which is not conducive to The bait is obtained evenly, and the growth is not synchronized; 5. Washing the net clothes or changing the cage for many times will cause mechanical damage to the shellfish seedlings and increase the mortality rate