How to design a crab pond: how to build a crab pond?
Source: crab culture technology time: 2020-11-2915: 46: 45.
Crab breeding in ponds is different from stocking in natural lakes and reservoirs. High stocking density should not only prevent crabs from escaping, but also create a good habitat for high-density crabs on a small water surface. Therefore, the technical requirements for pond construction are very high. To build a crab pond, we should do the following:
First, the choice of swimming pool construction address.
Selection of swimming pool building address
The location of the pool is rich in water, close to the outer river or river, and the water quality is pollution-free, including industrial pollution such as heavy metals and oleophenol; Agricultural pollution such as chemical fertilizers and pesticides. The soil quality is preferably clay, so avoid digging pools in swamp areas. At the same time, choose a quiet and convenient fork in the road.
Second, the requirements of crab pond construction
The area of crab pond should be 0. 1-0. 4 hectares. It's too big to manage, and the larvae attack each other easily. Infrastructure such as too small to escape is expensive. The depth of the pond is about 1.5m, and the water storage depth is 0. 8- 1.0m, east-west pond, rectangle, slope ratio 1: 3-4. The edge of the pond is more than 1m away from the escape prevention facilities, and a stepped pond slope with a width of 20-30cm is adopted, and each level is built into a crab nest with arched tiles.
The earth island designed in the pond can be used as a hidden place for river crabs to dig holes and shed their shells, which is safer than that for river crabs to shed their shells in shallow water near the pond, and can avoid or be less harmed by rats and water snakes. Eriocheir sinensis, which does not molt, often forages around the pond, which has little interference with the molting Eriocheir sinensis. The design of the entrance and exit of the crab pond requires the use of culvert gate, flat gate and barbed wire as the filtering and sealing structure to strictly prevent leakage.
Third, the construction of escape prevention facilities
Construction of escape prevention facilities
There are two escape peaks in the breeding process of Eriocheir sinensis, one is from juvenile crab with big eyes to juvenile crab I, and the other is the sexual maturity of Eriocheir sinensis. This is caused by the feeding habits and reproductive migration of river crabs. In other periods, as long as the water environment is good and there is a certain habitat and bait, fewer river crabs escape. At the peak of escape, river crabs also have a way of escape similar to "building a wall", and they will climb several stacks together when encountering obstacles.
It is necessary to combine the habits of river crabs when preventing them from escaping. The surface of escape prevention facilities should be smooth, so that river crabs can't climb, which is durable, resistant to wind, rain and sun, not easy to age and damage, insoluble and toxic, and low in price. When building the escape wall, the foundation should be solid, not collapse and not leak, and the bottom should be buried 30-40 cm underground to prevent collapse and rats from penetrating the wall.