Lakes, reservoirs, and catfish pollution-free cage culture

The non-polluted cage culture technology for lakes, reservoirs and catfish is based on the use of surface water plankton feed resources and organic detritus cages to raise catfish. This culture method has four characteristics: First, investment. Less, quicker, only need to make cages and purchase fish species to invest a small amount of money, do not feed feed, reduce the large amount of feed circulation; second, the fish is a green pollution-free product, the market price is high, the market is good, It is a good way for the people around lakes and reservoirs to increase income and get rich. Third, the farming techniques are easy to learn and the general public can master; the fourth is to purify water quality. Lakes and reservoirs have a large area of ​​accumulated rain, and industrial, domestic sewage, and humus on the mountains accumulate in large quantities, resulting in eutrophication of water bodies, massive reproduction of plankton, formation of blooms, and the cultivation of plankton can filter plankton and organic debris as Food, reducing water nutrients, so as to achieve the role of water purification. In the past two years, efforts have been made to promote the cultivation of squid in pollution-free cages in the Tianshengqiao Reservoir area. The effect is very obvious. Per capita net income of the surrounding people is more than 1,000 yuan. The per capita net income of the migrants in the village of Luwei, Maji Township, Linxi County, Guangxi, alone, has grown to more than 3,000 yuan per net. The squid pollution-free cage culture technology is introduced as follows:

Aquaculture water selection

The cage aquaculture waters should be within the aquaculture area planned by the local government and its fishery administrative department. The water quality should be free from pollution, sheltered from the sun, the water depth should not be less than 4 meters, the water surface should be open, the water quality should be fertile, plankton should be abundant, and it should not hinder shipping traffic. The reservoir should also pay attention to the difference in water level and avoid lowering the water level in the dry season to affect the cultivation. In general, medium-sized reservoirs are equipped with cages in the middle reaches. Large reservoirs should be installed in water areas where upstream water quality is not turbid.

Cage production and setup

1. Making cages: First make cage frames.

Non-polluted cages use cages for fish cages without the use of float buckets. They only use bamboo to form a 7m 7m square frame. They use bamboo buoyancy to prop up the cage, resisting wind and waves, and investing. Less suitable for mass culture. Net cages use fully closed cages, usually made of polyethylene mesh with a mesh of 3 cm or more. If 400 g to 500 g of fish are stocked, large-scale fingerlings with a size of 6 cm or more can facilitate the exchange of water inside and outside the cage and increase the feeding rate of farmed salmon.

2. Set up the cage: The cages should be arranged in the direction of the water flow. The waters with wide water surface can be arranged in multiple rows. The distance between rows is 20m to 30m. Each row is divided into multiple sections, and 15 to 25 networks are placed in each section. Boxes, each 15 meters to 20 meters apart, to facilitate the boat only free access.

When the cage is set up, first attach 400 kg to 500 kg of cement bricks to the bottom of each section of the cage as a sinker, and attach the upper bucket to the upper bucket to pull a tight rope between the two buckets. The two float buckets are relatively fixed, and the square frame is fastened diagonally between the two float buckets. Considering the supply of natural baits, the ratio of eel area to water area in cage culture in lakes, reservoirs and reservoirs should not be too large, and the cages should be scattered and set regularly. According to the current experience, in the fertilizer-rich waters with bait-rich organisms, the cage area can account for 1.5% to 2% of the total water area, while the water quality can only be 1%.

3. Prepare for stocking: After the cage frame is set up, do fish stocking plan. The cages can be hung on the frame about 7 days before the fish species is stocked. The purpose is to make the algae on the cages to avoid infection when the fishes enter the tank. When hanging cages, check whether there is any damage to the cabinet and whether the sewing box corners are firm. In addition to the opening of the box cover that is specially reserved for the fish into the box, is there any leakage in other places? When hanging the cage, just hang the four corners of the cage on the four corners of the frame and tighten it. If necessary, you can attach the rope to the middle of the cage. A 1 kilogram to 2 kilogram sinker is suspended at each of the four corners of the cage, and the cage is stretched to keep the enclosure free from the effects of currents and waves.

After hanging the cage, you need to hang an energy-saving lamp above each cage and turn it on at night. The purpose of doing this is to use the phototaxis of zooplankton to lure it into the cage and increase the amount of food in the cage. The quantity is conducive to the growth of carp; the second is the navigation light of lakes and reservoirs at night to avoid collision of vessels with cages.

Fish species stocking

1. Determination of cultured species: Cage cultured carps can be cultivated individually or in polyculture. The selection of the cultured species and their proportions depend on the composition of the food organisms in the water body and the economic benefits of breeding the species. Shallow waters, fertile waters, and relatively more phytoplankton should be dominated by carps; larger waters, large zooplankton and organic decay are more abundant, and should be dominated by carps; Relatively balanced, the implementation of a single breeding or squid with different proportions, there is no significant difference in the breeding effect. Therefore, different lakes and reservoirs are suitable for aquaculture with different species and proportions; the same lake and reservoir have different water areas, which can generally be adjusted by growth, and which kind of fish will grow more quickly, because most large water areas are The squid grows faster, so large reservoir lakes generally raise squid or squid.

Determining the cultured species not only depends on the composition of the food organisms in the waters, but also depends on the price difference of the squid and the preferences of the major consumer groups.

The ratio of the extract is the extraction of concentrated raw materials such as plant animals and extracts of the extract, flow extract or powder, the number of raw materials before extraction and extraction of concentrated products after the mathematical ratio.
The proportion of the extract is generally not very clear ingredients and content.
Such as 10 kg of scutellaria extract extracted into 1 kg of powdered products, we call the 10: 1 ratio of Scutellaria extract, the extract of baicalin, baicalein and other important indicators there is no clear standard.

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