Artificial propagation of crayfish

The problem of the full artificial propagation technology of C. chekinensis has not yet been completely solved. Therefore, experts recommend that artificial breeding of C. chebriformis is best done by artificial breeding. Conditional farmers can also perform semi-artificial propagation.

Artificial proliferation Every year from July to September, in the ponds that have not been cultured with crayfish, low-lying fields or shallow-water grass lakes, 18 to 20 kilograms of selected broodstock are placed per acre, and the ratio of male to female is 3:1. When the broodstock was released, the water depth was maintained at more than 1 meter. After the broodstock was released, the water was slowly drained to maintain the water depth of the pond at 0.4 to 0.6 meters. After the end of October, slowly add water to the pond so that the water level just submerges the cave of the crayfish crayfish. Autumn and winter can not feed, but to put water plants, and moderate fertilization to maintain water transparency 30 to 40 cm. After a large number of juveniles have hatched, they can use the cages to catch the prawn that have been bred. In winter, the depth of water is kept above 0.6 meters. The daily average temperature is below 4 degrees Celsius, and the water depth is better than 1 meter. At the beginning of March of the next year, when the water temperature rises above 100c, shrimp will leave the cave and come out for food and activities. At this time, management should be strengthened, water levels should be appropriately lowered to raise the water temperature, and feeding and fishing should be started.

Semi-artificial propagation excavate rectangular clay ponds 40 to 50 meters long and 6 to 7 meters wide, with a slope ratio of 1:1.5. Earth Pond Sisi set up a 50-60 cm high anti-flood network, soil pool on the cover shade net, water depth of about 1 meter. At the beginning of July, the selected broodstock will be placed in 180-200 kilograms for each pond, ie, 400-450 kilograms of broodstock per acre, with a ratio of 2:1 or 5:2. After the broodstock is released, good water quality is maintained, and microfluidic methods are available for the conditions. Feed it once a day, feed more animal feed with higher protein content, and place more water peanuts, water hyacinths, etc. In the middle and late August, male broodstock was started to be caught in shrimp cages. When juveniles appeared in September, shrimp cages were used to catch the bred females. The juveniles were fed intensively and hatched in batches.

Broodstock selection The time for picking broodstock is generally from June to September and should be taken directly from the pond or natural waters of the farmed crayfish. The proportion of males and females varies depending on the breeding method. Semi-artificial reproduction is preferably 5:2 or 2:1. Artificial proliferation is usually 3:1. Females weigh more than 30 grams and males weigh more than 40 grams. The time for the broodstock to leave the water should be as short as possible. The general requirement is that the time for leaving the water should not exceed 2 hours. Do not add ice to broodstock. Do not pick broodstock from the market.

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