Artificial release culture technique of hairy crab in river
In general, river crabs are cultivated in ponds. The need for escape prevention facilities, artificial bait, high cost. The artificial release culture of river crab is based on the special life law of river crab, such as young crab flowing upward in drainage ditch, adult crab crawling down close to the ground, generally not floating in water, etc. At the same time, it is a rich project with less investment and quick effect by combining the natural bait resources of river without artificial bait. The technical points are as follows:
First, river choice: choose a river far away from the city, no factories nearby, no three wastes emission, the river is wide, the water flow is gentle, the river is crystal clear, and the aquatic animals and plants in the water are rich.
2. Setting of ground cage: according to the growth law of crab, several ground cages with height of 60 cm and width of 80 cm are used to tie both ends in the early stage to prevent young crabs from escaping; in the middle rain season, the net is blocked at the gap of river course to prevent escape; in the later stage, the ground cage net is set downstream to catch adult crabs.
Third, the crab species: ① crab species selection: the crab species cultured in the river must select pure seedlings, complete limbs, normal body color buckle crab. (2) stocking time: late April to early May.③ stocking density: put specification of 600-1000/kg crab seed, density of 600-800 per mu.
IV. Daily management: do a good job in daily inspection of river courses, check whether the cage net is damaged, remove sundries in the net, especially in rainy season, pay attention to prevent river crabs from escaping at the gap of river introduction.
5. Re-capture: The growth and life law of river crab is: when the river crab reaches the commodity specification in the later stage of cultivation, it begins to flow down the river in groups. At this time, in the lower reaches of the river, it can be captured with multi-channel cage nets.
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Several key points of laying hen breeding management in winter
The weather is relatively cold in winter, our majority of laying hen farmers are most concerned about how to raise their own laying hens in winter, and ensure that the egg production does not decline and does not occur.
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A little knowledge of breeding that is helpful to you
The main results are as follows: 1. the liver is enlarged, copper-green, with necrotic foci of different sizes, and typhoid fever is common in clinic. 2. After ten days of age, we must make the chickens hungry every day.
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