Crab culture technology

Because of the love of crabs in recent years, livestock farmers have begun to breed crabs one after another. Because it doesn't take too much time to raise crabs, it is still quite satisfactory to farmers.

Crab farming techniques in ponds

1. Pond conditions

The crab has sufficient water source, convenient water intake and drainage, good water quality without pollution, clay, sand or sub-sand, good ventilation, which is conducive to the growth and reproduction of aquatic plants, benthic insects, snails and earthworms, etc. The old pond should be thoroughly dredged, and the shallowest part is 10cm. Several mounds slightly higher than the water surface can be built in the pond, namely crab island. Aquatic plants can be transplanted on the island. The pond should not be too steep. The slope ratio is generally below 1:1.5. Otherwise, the crab is easy to dig holes, which is not conducive to climbing out of the water surface at night. Artificial caves can also be built.

2. Transplanting aquatic plants

The natural yield of river crab mainly depends on the amount of aquatic plants and benthos (food organisms) in the waters. Planting aquatic plants is an indispensable technical measure in the breeding process. In addition to supplying vitamin supplements for crabs, the masses often say "crab size, look at water plants." Therefore, for pond culture crab, great efforts must be made to plant good aquatic plants. The main types of aquatic plants include duckweed, manjianghong, water hyacinth, floating lotus, verticillata verticillata, hornfish, bitter grass, water peanut, etc., and attention should be paid to disinfection and pest prevention when transplanting.

3. Escape prevention facilities

Anti-escape facilities are mostly plastic films, but also cement plates, depending on their respective circumstances.

4. Clear the pond and disinfect

Portunus trituberculatus is generally disinfected with quicklime in the pond half a month before the seedling is released, and the dosage is 75 kg per mu. On the one hand, it can kill harmful organisms, on the other hand, it can improve the bottom of the pool, increase the content of calcium ions in the water, and promote the molting growth of river crab. After receiving water, fertilizer should be applied in time to cultivate algae and basic bait. Transparency should generally be kept at 40~50cm. If tadpoles or frog eggs are found, they should be removed in time to avoid competition for food and harm to young crabs.

5, seedling

Seed selection, to the Yangtze River water system production of crab seedlings is the best, the requirements of neat specifications, complete foot, healthy, crawling active, no injury and no disease.

Seedling and density, seedling to pay attention to temperature difference. The seedlings purchased from other places cannot be directly put into the pool. They should be soaked in water for 2~3 minutes first, then taken out and placed for 10 minutes. Repeat this for 2~3 times. After the young crabs gradually absorb enough water and adapt to the water temperature, they can be put into the pool to improve the survival rate.

Density: Most of them are mainly polyculture, especially fish, shrimp and crab polyculture, and the economic benefits will be higher. Density can be controlled within 1500/mu, specifications 120~150 buckle crab. If the conditions are poor or shrimp culture is the main method, the seedling amount can be reduced appropriately.

Crab shopping tips

1, see

High-quality crab back shell was grayish, shiny, white abdomen, golden claws tufted yellow hair, bright color, rounded umbilicus, outward convex, limbs connected firmly curved shape, a large and old health, if the back was yellow, the meat is thinner. In addition, if it is a strong activity, crawling around the crab is a strong good crab.

2.

For the crab that meets the requirements by eye, it is necessary to weigh its weight with hands one by one, and the crab that feels heavy is fat. This trick does not apply to river crabs and live sea crabs, because these crabs are often tied up.

3, stripping

Peel crab navel cover, if the shell crab yellow more, neat, condensed into shape, then this crab is a good crab.

4, pull

If the purchase is dead crab, to observe the crab legs, intact, gently pull crab legs have weak elasticity, indicating fresh crab, if not fresh crab, gently pull crab legs, not only no weak force, but also crab legs easy to break off.

5 and smell.

If you smell the fishy smell of sea crabs, it means that sea crabs have become corrupt and can no longer be eaten. Eating putrefied sea crabs can easily cause food poisoning.

The best time to eat crabs

Around September of the lunar calendar, the female crab gonads mature and the meat is plump; after October of the lunar calendar, the male crab gonads mature and the meat is plump. Therefore, it is necessary to eat them in due time.

Crab capture method

1. Crab fishing

Crab is a kind of bamboo made of simple structure of the barrier foil crab fishing tools. Its structure is to use thin bamboo poles or thick reeds woven into foil, in the river port with current, lake branch favorable location, according to the pre-planned array piling set up. The lower end of the crab is inserted into the bottom of the water, and the upper end exceeds the water surface. The whole crab is regularly curved. Some drum-shaped crab baskets are hung at the upper end of the crab. The bottom of the basket has an inlet of crab and funnel-shaped inverted whiskers. The upper part has a cover. The middle is the concentration place of crab. When the crab moves into the sea through the waterway, it is intercepted by the crab on the water surface. After being blocked, it climbs up or drills into the crab basket. When fishing, the crab on the crab basket or crab basket is caught by fishing the sea.

2. Crab dragging net to catch crabs

The fiddler crab trawl is a wingless single-sac trawl gear consisting of a rectangular net with a waist-folded net pocket and a shallow sac net. The crab trawl is driven by a single boat. On one side of the boat, a net bamboo extends from each end and 8~12 nets are attached. At this time crab namely from the net mouth into the net, into the net, a part of crab along the net back forward crawling, blocking by the encounter, folding into the side net. The other part is left in the net bag, every 1 hour, net 1 time, transfer to other places, at the same time can be poured out from the net bag and net bag.

Crab trawling is one of the main methods of crab fishing in the Yangtze River, and it is also used in some lakes. This fishing method is widely used in the Yangtze River estuary from Anqing in Anhui Province to Shanghai, such as Chongming and Hengsha coastal areas, Huangpu River and Dianshan Lake in Shanghai, Hongze Lake, Gaoyou Lake and Baoying Lake in Jiangsu Province. It has the characteristics of small net, easy operation, full use of water flow power, etc. It is an effective tool for catching natural river crabs. However, there should be no sunken ships, reefs and quicksand in the operation area, which will destroy the trawl if encountered.

Taboo of eating crabs

Crab and sweet potato, pumpkin, honey, pear, pomegranate, tomato, melon, peanut, snail, celery, persimmon, rabbit meat, catnip with food; eat crab can not drink cold drinks will lead to diarrhea

To be honest, in the crab season, do not drink other foods after eating crabs or in the process of eating crabs, otherwise not only do not enjoy the food happily, but also may not pay attention to eating crabs, and let yourself have an unpleasant dining experience.