CATDOLL : CATDOLL: Whitebait Farming (Whitebait Farming Conditions)

1. What are the breeding conditions for whitebait?

1. Pond requirements

The first step in breeding whitebait is to build a pond suitable for the growth of whitebait. You can choose an old pond that has been used for breeding before. Make sure the pond water is clean, sheltered from the wind, with sufficient light and good drainage and irrigation capacity. Control the area and number of ponds according to the breeding quantity, and the depth of the pond should not be less than 2 meters. There should be a certain amount of aquatic plants around, and pay attention to the fact that whitebait is very fragile. Therefore, we cannot breed whitebait with carnivorous and omnivorous fish to avoid these fish attacking and eating whitebait.

2. Seedling cultivation

First, prepare the seedling cultivation pool, turn over the silt at the bottom of the cultivation pool, and then thoroughly disinfect it before adding an appropriate amount of clean water. Because the growth capacity of whitebait seedlings is relatively large, ordinary pond water cannot be used for cultivation, so fertilizer water is needed for cultivation. The young fish feed on rotifers and various anarthritic bodies. They start eating about 9 days after hatching. After they start eating, they must be fed in time. If they are not fed in time for more than three days, they will die. Therefore, before the young fish start eating, they must be fertilized to ensure that there is enough bait after the young fish start eating. Fertilize frequently during the cultivation period, control the amount of fertilizer according to the water color and water volume, and ensure that the transparency of the pond water is more than 35 cm.

3. Fish breeding

Adult fish have strong growth ability and their growth rate will be significantly accelerated. Therefore, it is necessary to fertilize frequently to cultivate plankton. Fertilizers can be decomposed farm fermented fertilizers. Control the amount of fertilizer and adjust it appropriately according to water quality and breeding quantity. Then, during the breeding process, it is necessary to prevent whitebait from floating, because the growth of whitebait requires very high dissolved oxygen. If whitebait is not handled in time after floating, it may cause large-scale death. When the floating phenomenon is serious, reduce the amount of fertilizer, avoid excessive plankton, change the water regularly, and increase oxygen in time.

4. Feeding and management

The diet of silverfish will change at a certain stage, gradually switching from vegetarian feed such as cladocerans to carnivorous feed. Therefore, we should regularly observe the growth of silverfish. When we find that most silverfish have a small amount of fish and shrimp in their stomach when their body length is close to 0.8-1 cm, it means that the silverfish is already in the diet conversion period. At this time, we should add an appropriate amount of small fish and shrimp that are smaller than silverfish to the feed to promote the growth of silverfish. Pay attention to the number of fish and shrimp to prevent overcrowding. Introduce an appropriate amount of pregnant shrimp in May and June, and the hatched shrimp will be just enough for the silverfish in time.

2. Can silverfish be artificially bred?

Whitebait can be artificially bred!

Pond farming

Choose an old pond with fresh water, no pollution, sheltered from the wind and facing the sun, and convenient water inlet and outlet. The single pond area is 0.2 hectares to 0.3 hectares (1 hectare is 15 mu), the integrated pond area is 0.3 hectares to 0.6 hectares, the pond is more than 2 meters deep, the bottom mud is 0.2 meters thick, and there are appropriate aquatic plants around the pond.

Seedling cultivation

1. Prepare a seedling stocking pond. Drag a net through the fertile water pond where fish are raised, stir up the bottom mud appropriately, and then pour the water into the stocking pond after dredging and pest control.

2. Stocking method. Stocking in the embryonic stage is more effective than in the fry stage. Put them in the pond for incubation one week before hatching. Put 20,000 fertilized eggs per 667 square meters (1 mu), and 30 kg of large whitebait can be caught from September to October. If the stocking amount is too large, there will be insufficient food for the fry. The pond water depth should be 1 meter to 1.5 meters.

3. Cultivation technology. Larvae feed on rotifers and nauplii. They start to eat 10 days after hatching, and will die if there is no food 3 days after starting to eat. Therefore, the stocking pond should be fertilized in advance to ensure that there is enough food when it starts to eat. The fully fermented manure is used for cultivation bait, and lime water is applied appropriately. After 10-15 days, the water becomes concentrated and the rotifers can reach a considerable density. Fertilizers can be applied frequently during the juvenile stage of whitebait. The amount of fertilizer applied should be controlled according to the water color and water temperature. Try to make the pool water transparency reach more than 40 cm and the water depth maintain 2 meters.

Fish farming

1). Provide sufficient bait. Adult fish (total length of more than 40 mm) have a large food intake and a significantly faster growth rate. Fertilizers must be applied frequently to maintain the density of plankton. Fertilizers should be decomposed and fermented, or a small amount of soybean milk can be sprinkled. Use 250-500 grams of soybeans per 667 square meters of water surface every day, and flexibly control according to water quality conditions.

2) Prevent floating heads. Whitebait has a higher requirement for dissolved oxygen than ordinary fish, and they always float first when mixed with other fish. When the water temperature is 20℃, floating heads will appear. If emergency measures are not taken immediately, a large number of deaths may occur. The way to prevent floating heads is to reduce the amount of fertilizer and prevent the over-reproduction of bait organisms. If the water is too fertilized, fresh water should be replaced as soon as possible. If necessary, an aerator or oxygenator can be used to increase oxygen.

3) Pay attention to the change of diet. There is a transition period for the diet of silverfish, which gradually changes from eating cladocerans and copepods to carnivorous. When fish and shrimp are found in the intestines of silverfish with a body length of nearly 80 mm, it means that the diet is changing. Small fish and shrimp should be introduced in time and maintained at a certain density to promote the growth of large silverfish. In May, suitable brooding shrimp can be introduced into the Yangtze River Basin. The hatched shrimps are just right for the large silverfish to eat during the transition period.

4) Prevent high temperatures. In hot seasons, the pool water should be kept at a depth of more than 2.5 meters, and shading measures should be taken when necessary to prevent high temperature hazards.