Fertilizing bait
Insufficient biological feed in the pool water should be given early to the application of organic fertilizer, cultivating rotifers, footpods, Cladocera and other organisms to provide sufficient natural biological feed for crayfish seedlings. Fermented livestock manure is generally administered, and the amount used is 250 kg - 350 kg 667 m2. Plankton is a natural biological food that juveniles like to eat. There are plenty of plankton in the pool, which can accelerate the development and growth of juvenile shrimp and increase the survival rate. In addition, fertilization can also promote the growth of aquatic plants and reduce the occurrence of moss.
Supplement plant
The conservation of aquatic plants is an important part of the cultivation of crayfish fry, and it is an indispensable technical measure. For some ponds and ponds with less aquatic plants, the plants such as Vallisneria, Elodea, and water peanuts should be planted in a timely manner so that the aquatic weeds account for more than 50% of the total pond area. It is strictly prohibited to use herbicide-containing drugs in the planting areas of aquatic plants; when using quicklime, we must also avoid aquatic plants that have barely survived. In early spring, it is necessary to strengthen the feeding of feed and minimize the damage of crayfish to the young shoots of aquatic plants and protect the rapid growth of aquatic plants.
Water quality regulation
Water is added once every 7 days to 10 days. Each time water is added 20 cm to 30 cm, it is advisable to keep the water level at about 1 meter. One quick lime is used every 15 days to 20 days, and the dosage is 10 kg 667m2. The use of quicklime not only can adjust the pH value, but also can increase the calcium ion content in the pool water to meet the calcium requirement for the growth and development of juvenile shrimp. The oxygen-increasing equipment is installed with a dissolved oxygen controller to set the minimum and maximum limits of the water-soluble oxygen in the tank, and the oxygen-increasing equipment is automatically opened and shut down, so as to keep the water-soluble oxygen in the tank above 5 mg/l. When the oxygen-increasing equipment fails to use, an oxygen abatement measure can be used to release the particulate oxygen.
Feeding
The crawfish are of mixed food and are able to ingest plant and animal food. When the pool water temperature reaches 10°C or more, crayfish begin to feed. After broodstock has spent a winter lacking food nutrition, it needs to eat a lot of food to supplement the nutrients. The growth and development of larvae need to consume a lot of food. If you do not feed in early spring, it is very easy to cause broodstock destitution, triggering the occurrence of mutual attack and killing, and even cause disease and death. Therefore, in the bait feeding, we must focus on two aspects: on the one hand, catch the bait quality. In early spring, the body of wintering shrimps is relatively weak, and feeds with higher protein content should be fed, and some fresh and mixed fish, snails, etc. should be properly matched to increase the fullness and survival rate of broodstock, and at the same time to meet the nutritional requirements for the development and growth of shrimps. Demand; the other is scientific feeding. The water temperature in early spring is relatively low, and crayfish eat less. Therefore, it is reasonable and appropriate to grasp the amount of feed. Normally, it is fed twice a day, and once in the afternoon and in the afternoon. In addition, some bran, soybean meal, or a paste diet processed from corn or wheat can be added to the pond to feed the young shrimp.
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