A winter pond net cage intermediate culture method for stichopus japonicus larvae

Abstract

The invention provides a winter pond net cage intermediate culture method for stichopus japonicus larvae. The method comprises the steps of selecting a culture pond with a water depth of 1.8m-2m; erecting net cages, with the top surfaces of the net cages being 5cm-10cm lower than a water surface; making W-type adhering substances with 6 mesh-10 mesh polyethylene nets and distributing the adhering substances in the net cages uniformly; performing daily management of adjusting the water quality of pond water, and putting larvae in the pond at the end of October or at the beginning of November, with the stocking density being 0.5Kg per net cage to 0.7Kg per net cage; increasing light illumination in an icebound period in winter and monitoring under-ice water quality indexes; after ice melts, starting an oxygenation apparatus to promote vertical flow of water and improve the water quality environment; when larvae in the cages reach 250/kg-300/kg at the end of April, selling the larvae as commercial larvae for culture. The method can increase the culture space after the water is icebound, create the optimal environment for overwintering of sea cucumbers, greatly increase the effective usage area of adhering substances, reduce the production cost of larvae, basically guarantee all-weather production all year round, increase the culture survival rate and body wall production rate, and guarantee the quality of adult sea cucumbers.

Description

technical field [0001] The invention relates to a method for intermediate cultivation of japonicus seedlings in pond net cages in winter, which can be used for intermediate cultivation of japonicus japonicus seedlings in winter ponds with small size seedlings, and can effectively improve the growth speed of japonicus japonicus seedlings in winter intermediate cultivation in ponds. Background technique [0002] Sea cucumber belongs to Holothurioidea and is a sea treasure with high economic value. In recent years, the scale of sea cucumber farming has continued to expand, and the economic benefits have continued to improve. At present, the sea cucumber farming area in my country exceeds 200,000 hectares, with an annual output of 206,800 tons. It has become a pillar species of marine aquaculture in coastal areas such as Liaoning and Shandong. [0003] At present, the source of seedlings required by sea cucumber breeding enterprises is mainly provided by industrial nursery rooms...

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Problems solved by technology

[0003] At present, the source of seedlings required by sea cucumber breeding enterprises is mainly provided by industrial nursery rooms, and the cost of industrial seedling breeding is relatively high, especially for indoor overwintering of small-sized seedlings, which need to be cultivated at elevated temperatures, which greatly increases the cost of sea cucumber seedlings. In recent years, due to the influence of the economic situation and other aspects, the market price of sea cucumber and sea cucumber seed has dropped significantly, which has seriously affected the economic benefits of sea cucumber seed production enterprises. Some enterprises even suffered losses. Many enterprises The indoor cultivation of japonicus seedlings in winter has been stopped, which affects the supply of spring japonicus seedlings on the market; at the same time, the seedlings produced by factory indoor artificial seedlings are weak in adapting to the environment and poor in disease resistance. After arriving in ponds or sea areas, the survival rate is low and the quality of adult ginseng is poor; a few enterprises use antibiotics and disinfectants in the production process of indoor seedlings, and there are hidden dangers of drug residues, which seriously affects the healthy development of the sea cucumber breeding industry

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