First, fertilize bait
In early spring, the water quality is relatively thin and there is a lack of biological feed in the pool water. Organic fertilizer should be thrown in early and rotifers, footpods, and horns should be cultivated to provide sufficient natural biological feed for lobster seedlings. Generally, the fermented livestock and poultry manure is administered, and the amount applied is 250-350-667 667. 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.
Second, make up water plants
Maintaining aquatic plants is an important part of the lobster rearing process and 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, we must strengthen the feeding of feedstuff to minimize the damage of the lobster to the sprouts of aquatic plants and protect the rapid growth of aquatic plants.
Third, the bait feed
The lobster is miscellaneous and can ingest vegetable and animal food. When the pool temperature reaches 10°C or more, the lobster starts 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 to catch scientific feeding. The water temperature in the early spring is relatively low, and the lobster eats less. Therefore, the amount of feed should be reasonable and appropriate. 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.
Fourth, water quality regulation
Add water once every 7-10d, add 20-30% water each time, and keep the water level at about 1m. Use 1 quicklime every 15-20d, dosage is 10?667?. The use of quicklime not only can adjust the ph value, but also can increase the calcium ion content in the pool water so as to meet the calcium requirement for the development and growth of the young 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 be used, an oxygen abatement measure may be used to disperse the particulate oxygen.
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