A kind of method for cultivating mud crab zoster and megalopa in ponds

Abstract

The invention relates to a method for cultivating mud crab zoa larvae and megalopa in ponds, which includes preparation for cultivating ponds, cultivation of bait organisms, planting of seedlings, feeding of bait organisms, and water quality ecological regulation. In the present invention, one egg-bearing crab is placed in every 100 cubic meters of water body, and the amount of egg-bearing crabs is about 1 million, and the density of hatched stage I flea-shaped larvae is controlled to be about 10,000 / cubic meter. And in the later period of stage IV zoa larvae, appropriate amount of copepods were put into the pond, and in stage V zoa larvae, copepods and larger artemia nauplii were used as the main bait, which was rich in biological species and balanced and comprehensive in nutrition. Cultivating larvae has fast growth, uniform specifications, good physique and color, and high survival rate. The water quality is stable and does not require a large amount of water change; it can greatly reduce the cost of seedling cultivation and increase the income of seedling cultivation. It has the advantages of low threshold, low production cost, strong stability, easy to master, etc., and is suitable for promotion and popularization, thereby effectively promoting the sustainable and healthy development of my country's blue crab industry.

Description

technical field [0001] The invention belongs to the technical field of seed cultivation of aquaculture, and in particular relates to a method for cultivating mud crab zoea and megalopa in ponds. Background technique [0002] Scylla paramamosain (commonly known as blue crab) is a carnivorous, wide-salt, wide-temperature seawater economic crustacean. It is large in size, delicious in taste, fast in growth, and can be transported away from water. One of the important marine economic cultured crabs. In recent years, blue crab farming has flourished in the coastal provinces of southern my country, with a breeding area of ​​nearly 30,000 hectares and an annual output of more than 150,000 tons (China Fishery Statistical Yearbook, 2017). %, portunus artificial seedlings accounted for 70%, blue crab breeding seedlings almost all rely on wild seedlings in natural sea areas. Since wild seedlings have many uncertain factors such as unstable quantity and quality and are easy to carry ge...

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Problems solved by technology

[0004] Scylla serrata industrial seedling raising technology (Ren Fuhai etc., Hebei Fishery, 2010 No. 1) has announced a kind of method of blue crab industrial seedling raising, but at first need to build industrialized workshop when blue crab industrial seedling raising, And equipped with heat supply, gas supply, water supply, light control and other facilities, in general, the construction of a 1,000 square meter industrial nursery requires an investment of at least 300,000 to 400,000 yuan

In addition, the bait organisms during the seedling cultivation period all rely on artificial cultivation and feeding. The density of seedlings per pond is about 100 / ml, and the Z1~Z2 stage is cultivated with rotifers at a higher density of 20~30 / ml, which requires a large number of water changes. Control the water quality to be stable, and the cost of raising seedlings is relatively high

Affected by these factors, it is difficult to promote and popularize the blue crab factory breeding method

[0005] A method for ecological seedling cultivation in mud crab ponds (application publication number CN 102090356A) discloses a method for ecological seedling cultivation in mud crab ponds. The egg-bearing crabs hatched 1 million stage I flea-like larvae, and the larvae density was only 1500-3000 / cubic meter), which was far lower than the stocking density of industrialized larvae (about 100,000 / cubic meter). rather big

Moreover, Artemia nauplii is used as the main bait for the cultivation of daphnia larvae. In recent years, due to the decrease in the amount of artemia resources in the international market, the price of Artemia eggs, which is the main cost of breeding blue crab seedlings, has been increasing year by year (the price of Artemia eggs in 2018 was 100-200 yuan / catties, which is twice the price in 2017), the uncertainty of seedling raising costs has a greater impact on the enthusiasm of seedling production units

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