How to improve the quality of crab

How to improve the quality of crab

From the aquatic product market in recent years, we have seen that large, full, brightly-coloured river crabs have high prices and large sales, while small, blackish and yellowish river crabs are not only low-priced but also difficult to sell. The situation will become more prominent as the level of consumption increases. Raising the quality of river crab is a comprehensive breeding process. This article discusses its views from the following key aspects for reference. 1. Choose the first-line crabs with normal specifications, healthy and disease-free and normal body color. The crabs of Liao or Changjiang can be used. The crabs of the Yangtze River are preferred, and the size of the crabs should be 80 to 150 eggs per kg. The first time after the oyster shell easily produce early maturation, affecting the growth and development, female crabs will also cause oyster shells difficult to die, then the crabs due to the development of small specifications should be stocking. 2, stocking control stocking density. Many farmers have adopted high-density farming to increase production. After a large population density, feeds are bound to increase, photosynthesis is destroyed, water quality deteriorates, and crab growth is affected. Therefore, both ponds, fences, and paddy fields should be controlled. Within a reasonable range. Crabs in general ponds are stocked with 20-30kg per 667m2, crabs in rice fields are stocked with 4-6kg per 667m2, and there are large differences in net enclosures, which are mainly based on engineering standards, water quality environment, irrigation and drainage conditions, and management techniques. The stocking time is mainly from December to February to March of the following year. If it is a crab species for long-distance transportation, it will be repeated several times. Before stocking, crabs should be soaked with potassium permanganate solution of 20-40 g/m3 for 10 minutes to eliminate bacteria and parasites on the crabs. 3, management 3.1 bait management As the crabs after 4 to 5 months of the winter period, the body of nutrient consumption is very large, generally before and after Ching Ming will be timely feeding some high-quality bait, to promote its return to physical fitness as soon as possible, successfully completed the first time shell. The first oyster shell is very important for the survival rate of aquaculture. Before July, animal feed (such as wild fish, animal viscera, etc.) rich in protein should be fed. In July and August, vegetable food should be the main ingredient (such as Water grass, wheat, melons and potatoes) should be based on animal feeds during the late growth period. Compound feeds can be fed for a long period of time, and live baits such as snails and puffer shrimps are also available. Feeding time is 1 time in the morning and 1 evening, 70% of the total amount in the evening, 3 to 4 hours after eating, adhering to the "four set" principle, multi-point feeding, and appropriate according to water temperature, water quality and food intake Adjustment. 3.2 Water Quality Management Water quality directly influences the body color and growth of crabs. Because of unstable water levels and insufficient water sources or water quality, crabs are prone to burrowing in the bottom of mud or holes for a long time. Old crab." Therefore, to raise crabs in paddy fields and ponds, it is necessary to replace new ones. In hot seasons, new water must be constantly added to ensure the transparency of the pool water is above 35 cm. Second, aquatic plants should be planted, mainly submerged plants (grassland, turnips, Black algae, etc.), supplemented with emergent plants (? White, reeds) and floating plants (water peanuts, etc.) to improve water quality through photosynthesis; 3 to be regularly disinfected, generally available with 10 to 15 kg of quick lime per 667 m2 of water, after the water Spilled pool, the entire growth period is 3 to 6 times. For the nets to raise crabs, especially when the long-term drought and low rainfall cause the water level to drop and it is impossible to make up the water, promptly take measures to move the crabs to deep water areas or sell them in advance. 3.3 Husk period management From crab species to adult crab shells 3 to 5 times, within 1 to 2 days of oyster shells, the crab body is tender and soft, losing its foraging and defensive capabilities. We must also ensure that there is a quiet environment in the farming waters, so that it can be smoothly shelled.

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