Krill crayfish is commonly known as crayfish. Due to the reduction in natural resources of crayfish in recent years, artificial crayfish breeding has been carried out in many areas of China. However, in the breeding process, there is often a serious fratricidal phenomenon between crayfish, so the survival rate of culture is low.
First, the cause of the killing phenomenon
1. High breeding density In the breeding process of crayfish, the breeding density should not be too high. If the raising of the breeding density is pursued for yield and profit, it will increase the difficulty of breeding because the breeding density is too high, and the space between the lobsters will definitely exist. The competition for food has led to an increase in the probability of cannibalism. Moreover, high-density farming requires a large amount of bait to be put. Excretions and residual bait left on the bottom of the pool will spoil the water quality, contaminating the growth environment of the crayfish, and surviving. Space will also be compressed along with it, which will further aggravate the fratricidal phenomenon.
2. Insufficient fodder Crayfish is an omnivorous animal. Both plant feed and animal feed can be ingested, and they are bulimia. When the feed is insufficient, crayfish often appear slaughtered. Therefore, in the breeding process, the supply of crayfish bait must be guaranteed. In addition, crayfish belong to the nocturnal animals, often out of activity, feeding at night, so in the feeding process, we should pay attention to the rational deployment of the amount of feeding in the morning and evening. Usually the amount of feed at night should be about 60% of the total amount of feed for one day.
3. Poor water quality Many fish farmers mistakenly believe that natural crayfish often live in stinking ditch, ponds and other places, have strong ability to resist pollution, and can survive under poor water quality conditions. In fact, crayfish also have certain requirements on water quality. Excessive water quality conditions will reduce the physique and vitality of crayfish and increase the killing rate.
4. Breeding specifications vary. Some fish farmers did not pay special attention to the specifications of crayfish in the breeding process. The size of crayfish varied during the stocking process. The phenomenon of prawns eating shrimp was very serious and was not conducive to raising the aquaculture production.
5. Lack of concealed species Crayfish have a strong habit of occupying land. When there are not enough caves and aquatic plants for hiding, self-mutilation is extremely serious.
6. The lobster was ferociously killed after being slaughtered. The crayfish could not only be eaten by the same kind of clams, but even the unsalted crustaceans could be massacred. This is one of the important reasons for the low survival rate of crayfish.
Second, prevent slaughtering methods
1. Increase concealment or create artificial caves Crayfish have the habit of clinging to aquatic plants. Therefore, when the crawfish breeding density is too high, aquatic plants such as peanuts can be placed in the water as hidden objects. This can increase the living space of crayfish and reduce the number of crushes. , but also can be used as crayfish food. Branches can also be used as a cover in areas where grass is lacking. In addition, crayfish like burrowing, the establishment of artificial caves to prevent the killing of crayfish have a good effect. The artificial cave can be built on the pool slope below the water line. The diameter of the cavern is 6 to 10 cm and the depth of the cave is 15 to 30 cm. Can also be made of cans and other waste into artificial caves placed at the bottom of the pool for crayfish habitat, the effect is quite good.
2. Crayfish specifications should be basically the same when the crayfish stocking, it should be noted that the stocking specifications can not be too different, can also be large, medium and small size of the three sub-pool feeding, in order to reduce the occurrence of prawns eating shrimp phenomenon.
3. Ensuring the quantity and quality of feedstuffs Crayfish have a large food intake. Therefore, it is important to ensure that the crayfish are fed enough feed and the feed must be fresh. It is usually possible to feed some wheat, aquatic grasses, feeds, and live snails to meet the growth needs of crayfish. Feeding amount should be controlled in the basic finish is appropriate to ensure the pool water quality and reduce the lobster's homicide rate.
4. Timely improvement of water quality During cultivation, the pH of the pool water is maintained between 7.5 and 8.5, and the transparency is 30 to 40 cm. It is necessary to frequently add new water, regularly spill the raw lime slurry, and adjust the water quality. When the pool water is aged, it should be replaced in time to speed up the process. The growth of crayfish improves the survival rate of culture.
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