Original author, please refer to the following methods on how to control dragon lice: 1. Environmental settings: Breed in places with less pollution as much as possible. Try to choose breeding farms away from roads and factories with many vehicles (especially chemical plants). The water body is required to be non-toxic and polluted. The water depth should be kept at 50 to 100 centimeters. There is no need to change the water frequently. However, the water should have no odor and should be protected from direct sunlight and overheating. Some aquatic plants should be planted in the water, such as water lilies, etc., and there should be Add anti-fly net.

2. Seedlings: Generally, you can purchase seedlings from a reputable seed supply unit. This can not only ensure the quality of the variety, but also allow the manufacturer to provide better technical guidance and consultation. You can also buy seedlings in the spring. At the turn of summer, dragon louse larvae are caught in the fry pond and raised until they pupate and emerge into adults in autumn.

3. Feeding: Dragon lice are mainly carnivorous, but can also be herbivorous and detritivorous. They are good at capturing small organisms, organic matter and aquatic plants in the water. Under artificial breeding conditions, the feed of dragon lice is generally corn flour, rice bran, wheat bran and sweet fruits. It can also be fed with smashed apple snails, as well as pigs, chickens, cows and ducks that are widely found in rural areas. The scraps are generally fed once a day in the evening, and the feeding amount is 7% to 8% of the total weight of the dragon louse (the food intake of each dragon louse is about 0.15 grams). Feeding cannot be fed every other day to avoid mutual cannibalism, and it cannot be fed Feed poisonous and infectious food, otherwise the dragon lice will die or be unable to reproduce for a long time.

The breeding cycle of dragon lice is 8 months. In the first 3 months, meat is mainly fed, such as snails, beef liver, fresh scraps, dead fish, dead shrimp, etc., and in the next 5 months Mixed feeds are mainly fed, that is, meat and plant-based feeds are mixed in a certain proportion and then fed.

This species has the ability to swim underwater. It hugs a bubble with its hind legs and breathes the air in the bubble. When it needs to rise to the surface for air, the bubbles also help it float.

There is a type of beetle that can dive, called a dragon louse. They are closely related to carabid beetles that hunt on the ground, but are well adapted to life in the water. Their bodies are streamlined and very smooth, allowing them to swim quickly; the second half of their hind feet have a tuft of long bristles that can be used as paddles for paddling. The larvae of these dragon lice are commonly known as water tigers. The name makes sense because they have long, sharp jaws and are very ferocious in chasing prey, which include insects, tadpoles, and even fish. The larvae and adults of dragon lice pierce their long hollow jaws into the prey body, inject some digestive juice into it, digest the contents of the prey into a liquid state, and then suck it with their long jaws.

Dragon lice have to go to the water to breathe, so they are actually land beetles, but they hunt in the water for a long time. The larvae of other beetles are completely aquatic and even build cocoons inside them. These are beetles of the family Phytidae. The larvae of the black beetle breathe through the tracheal gills; the adults breathe through the trachea and often bring an air bubble with them when diving for breathing in the water.