Method for realizing ecological larval culture on rapana venosa

Abstract

The invention relates to a method for realizing ecological larval culture on rapana venosa. The method is characterized by comprising the following steps of: firstly selecting a pond which is convenient in water exchange, takes lithoherm and stone bottom as a substrate and is in the size of 2-5Mu; then placing mature rapana venosa with the length of 7-10cm into the pond in the quantity of 100kg per Mu, mating and spawning after the rapana venosa eats ruditapes and mussel for 2-3 days, when enough oocysts are obtained, removing the rapana venosa away, incubating the oocysts for 20-22 days at the water temperature of 20-25 DEG C to obtain planktonic larva, growing the planktonic larva by eating the planktonic larva in the pond, starting to throwing polyethylene corrugated plate adherence ortile under the condition that the water temperature is 22-25 DEG C after 15-16 days, sticking benthic diatom and the planktonic larva onto the polyethylene corrugated plate or tile, transfigurating the planktonic larva of the rapana venosa into young spiral shell after 5-6 days, growing the transfigurated young spiral shell by eating the planktonic larva and benthic diatom on the corrugated plate, wherein the survival rate of the transfigurated young spiral shell on the corrugated plate can reach more than 50%, and feeding small low-value bivalve to the young spiral shell with the length morethan or equal to 3mm. By applying the method provided by the invention, the defects that the survival rate is low and the larval yield is low as bait conversion is difficult and water is polluted when carnivorous fish mice are used as feed in indoor artificial larval culture can be overcome, and the larval yield is improved by more than 50% compared with the indoor artificial larval culture. Meanwhile, the production cost is saved as no bait is thrown into the pond, thus the method is environment-friendly, and the produced larval is strong.

Description

technical field [0001] The invention relates to a method for raising seedlings of red snails, in particular to a method for ecological seedling cultivation of red snails. Background technique [0002] Rapana Venosa (Rapana Venosa), also known as red snail, is a unique economic shellfish that lives along the coast of the Yellow Sea and Bohai Sea. Because the red snail has the advantages of fast breeding growth, short breeding cycle, strong disease resistance, high survival rate, and significant economic benefits, the scale of its breeding is constantly expanding, so the demand for seedlings is also increasing. At present, the cultivation of red snail seedlings in my country is still in the experimental stage. Since the red snail is a carnivorous shellfish, the difference from the abalone nursery is that the benthic diatoms are mainly used after the abalone is attached to the plate, while the carnivorous bait is mainly used after the red snail is attached to the plate, and the...

AI Technical Summary

Problems solved by technology

[0005] The invention overcomes the problems of low survival rate and low seedling emergence due to difficulty in bait transformation and water quality pollution caused by feeding carnivorous surimi in indoor artificial breeding, and the emergence rate is increased by more than 50% compared with indoor artificial breeding