Can the double lipped fish be polycultured with river crabs, and can river crabs and fish be polycul

1. River crabs and fish can be polycultured together, and polyculture has the following advantages:

1. It does not affect fish production.

2. Do not occupy farmland and other ponds to develop crab production.

3. The method is simple and the technology is easy to master.

4. The size of the pond is larger, and the quality is better than that of the river crab pond.

5. The economic benefits are relatively stable. The output value of fish and crab polyculture ponds per mu can reach 30 60% of the total output value, and the net income can reach 50 70 of the total net income.

6. Low cost. If it is a continuous intensive fish pond, the number of ponds is large, the coverage area is large, each pond adopts the fish and crab polyculture mode, because the pond ecological conditions are better, the activity range of the river crab is not large, in the growing season of the river crab, rarely climb into other fish ponds, so usually only need to place the barrage net at the pond inlet and drainage, and the pond does not have to be provided with anti-escape facilities.

Second, polyculture methods.

1. River crab stocking mode.

The yield per mu of river crabs is required to be 10kg and 15kg, so 5g of 15g crab fingerlings are stocked; The yield per mu is required to be 25kg, and the stocking crab seed is l0kg; The yield per mu is required to be 40kg, and the stocking crab seed is 15kg.

2. Stocking water peanuts.

A certain amount of water peanuts are stocked in the corner of the adult pond, accounting for about 5% to 10% of the pond area. Stocking water peanuts has the following benefits: Water peanuts can be used by river crabs to inhabit and molt; It can be eaten by river crabs (grass carp and bream do not feed on water peanuts); If the pond is deprived of oxygen or splashed with medicine, river crabs can crawl on water peanuts to save lives.

3. Feeding management.

River crabs are very sensitive to the lack of oxygen in the pond water, so in the high temperature season, they should be filled with water every other week or so to maintain the water quality"Fat, lively, cool"。In terms of bait, in addition to the grass and commercial feed fed for fish farming, some animal bait that river crabs like to eat can also be appropriately fed. The bait can be dropped near or in the peanut bushes, and is usually fed at night.

When preventing and controlling fish diseases in ponds, it is forbidden to use crustacean sensitive drugs such as trichlorfon. Daily management with pond fish farming.

4. Adult crab fishing.

The fish in the fish and crab polyculture pond will not be caught until the winter to dry the pond and end production; Adult crabs must be caught before the autumn and autumn cold spells arrive. In addition, the polyculture of fish and crabs carried out in contiguous intensive fish ponds is generally not equipped with escape prevention equipment, so it is necessary to catch river crabs before they start their reproductive migration (usually from the end of September to mid-October). Otherwise, the recapture rate drops significantly.

Fish and crab polyculture cannot be caught in fish ponds, nor can crabs be caught in dry ponds. Generally, artificial crab holes, crab traps and night light trapping methods are used to catch them, and then put them into adult crab temporary breeding ponds for 1 month and 2 months before being marketed.

It's better not to raise them together, because the crabs will shed their shells, and if they are carnivorous fish, they will eat them.