I want to raise crab roe! Hope the experts can help me!

1. Pond crab farming: Crabs are cultivated in ponds, which can control the entire artificial reproduction process, and the recapture rate is very high, but the size and meat quality of ponds are not as good as those of crabs cultured in large water bodies. According to the breeding method, it can be divided into:

1. Pond monoculture: mainly crabs, with some fish. The average yield per mu is about 50-75 kg, and high-yield ponds can produce up to 200 kg of crabs.

2. Fish and crab polyculture: mainly fish, some crabs. In general, crab yields are about 15 kg per mu, and high-yield pools can reach up to 40 kg.

2. Crab farming in lakes and ditches: crab species are raised in natural waters, with good environmental conditions, sufficient natural bait and low cost, and crab specifications are large. But the recapture rate is low. According to the current breeding methods, it can be divided into:

1. Crab seed release in lakes and rivers: This breeding method has a history of decades, and in the 60s and 70s, crab seedlings were discharged from lakes and ditches; In the 80s, it was changed to stocking young crabs; In recent years, in addition to stocking crabs, stocking one-year-old crabs has also had significant effects. However, this type of farming is usually not fed bait, and its production results are greatly influenced by natural factors and are still a widespread method.

The water quality of stocking requires good water quality, dense vegetation and gentle flow rates, and the outlet that communicates with the outside world has better benefits. In general, the catch rate of crabs is only to 5 .

2. Prepare for the lake net enclosure crab farming: choose the aquatic plants in the lake to be lush, the water quality is good, the water flow is mild, the water depth is moderate, the mesh arch forms a certain area (dozens of acres to hundreds of acres), according to the growth requirements of the river crabs, intensive feeding. This method of cultivation absorbs the advantages of pond imitation and lake crab culture.

The water quality is good, the activity space is large, the bait is sufficient, the density is relatively thin, and the river crab is large. The recapture rate can reach 40 to 60, low cost and high efficiency. Typically, 15 kg to 30 kg of crab can be produced per acre, and high-yield nets can increase crab production to 65 kg per acre.

3. Crab farming in Caodang and Lutan: Caodang and Lutan are suitable for the ecological requirements of the growth of river crabs, with low production cost and large market scale, but low recapture rate.

Fourth, rice field crabs: the use of rice field crab farming is the development of new aquaculture industry in recent years, the method can not only fertilize in the rice field, kill pests, remove weeds, increase the weight of rice 1000 grains, slightly change the rice field environment, but also adapt to the growth of crabs. Generally speaking, compared with the rice fields without crabs, the rice yield of crab farmed rice fields has increased slightly, with a yield of 20kg to 30kg per mu, and high-yield rice fields can reach 50kg to 75kg mu, and the benefits are very significant.

1. It is best to use a lid for the fish tank to prevent the crabs from escaping. Plant a aquatic weed, put some small stones and sand, and more realistically simulate the wild living environment of crabs. Crabs are also burrowing animals, so it's best to pick up a tile, wash it and put it in a fish tank, and let it live in it.

Crabs should also bask in the sun, but not for too long.

2. Feed crabs bread crumbs, potato crumbs, steamed bread crumbs, rice, snails, small fish and shrimp and other foods next to cracks.

3. The source refers to changing the water once a week, and it is best to use natural living water [river water, lake water], and use tap water for two days if not. The water should be over the back.

4. When the crab is shelled, the shell is yellow, and the body is soft after the shelling, so it should be raised separately from other crabs to avoid cannibalism. And feed more meat foods, such as small fish and shrimp.

First, the liquid retention is the size of the sufficient amount of aquatic plants**:

In order to provide a comfortable and safe habitat for hairy crabs, Mrs. Crab's breeding staff pays great attention to the high level of aquatic weeds.

A sufficient amount of aquatic plants such as peanuts, duckweed, reeds and white peony can provide cool shelter for hairy crabs; Algae such as black algae, sorghum grass, and goldfish algae are abundant, which can create a good habitat for hairy crabs to grow and molt, and facilitate feeding and avoiding enemies.

At the same time, farmers also need to ensure that the aquatic plants used for shading do not cover the entire surface of the river pond, reserve sufficient space for hairy crabs to move, and remove polluted aquatic plants in time to avoid damaging water quality and breeding bacteria, affecting the growth of hairy crabs.

2. Pay attention to scientific feeding of bait: scientific feeding is a vital part of hairy crab breeding. During the more than 180-day breeding cycle, Mrs. Crab's breeding staff needs to make more than ten adjustments to the bait to ensure that the hairy crabs can obtain sufficient nutrition at different growth stages.