Rapana venosa ecological breeding method

Abstract

The invention relates to the field of Rapana venosa artificial breeding, in particular to a Rapana venosa ecological breeding method. The method comprises: transferring egg bags into a plastic basket or net cage (10-20mesh) for suspended hatch in a nursery pond and charging air continuously, wherein the density of the egg bags is 5,000 to 8,000 / m<3>; breeding larvae at a density of 1 / ml with bait made of chlamydomonas (diatom and tetraselmis are preferred) in an amount of 1.0 to 12.0*10<4> / ml every day at a water temperature of 22 to 26 DEG C; continuously charging air, changing 1 / 2 of water every day; and when the larvae grow three whorls to a size of 700 to 800 micrometers, placing the larvae in to 60-mesh net bags, cages or tanks together with double-shell spats (animal baits for transformed Rapana venosa) for sea breeding.

Description

technical field [0001] The invention relates to a method for raising seedlings of red snails, in particular to an ecological seedling raising method for red snails. Background technique [0002] Red snail (R apana vanosa ), commonly known as red snails, are mainly distributed in the Bohai Sea, Yellow Sea, East China Sea and South China Sea, and are also abundant along the coasts of Japan and the Korean Peninsula. The output along the coast of the South my country Sea is relatively small, while the output in the Bohai Sea and the Yellow Sea is large. The snail has a large body, with an adult shell height of 110-120mm (maximum 140mm). Its feet are particularly hypertrophic, rich in nutritional value, and delicious in taste. It is a popular delicacy for modern families and hotel tables, and is often used to replace abalone. In addition to eating fresh, snails are often processed into canned or dried products, and the market prospect is broad. Since the 1980s, due to overfis...

AI Technical Summary

Problems solved by technology

[0004] Looking at the research status at home and abroad, there are only a few reports on the reproductive biology of snails. The artificial breeding of snails is basically in the small-scale experimental stage. Because the main technology cannot be broken through, there are high seedling costs and low seedling emergence. , Unstable emergence rate and other issues, it is impossible to realize the demonstration effect of large-scale seedling cultivation

After the fertilized eggs of the red snails develop into vegetal larvae, the planktonic larvae that feed on phytoplankton gradually metamorphose into animal-eating benthic juveniles. In the artificial breeding of red snails, the benthic snails often have attached The corrugated board of diatoms is used as the attachment base for creeping larvae after metamorphosis. Because the feeding habits of creeping larvae are converted to animal feeding habits, fresh clam meat fragments need to be sprinkled on the attachment base as bait. The residual bait and feces on the attachment base will deteriorate. The deterioration of water quality and the low survival rate of larvae have been unable to realize the mass production of commercial seedlings, which has seriously affected the development of the scale of red snail culture.