The nutritional value of the dragon louse is very high, its body protein content of up to 23. 8%, fat content is only 3. 6% ash content of 9. 2%, is a typical high-protein, low-fat, low sterol food, modern medical research has shown that: eating dragon louse on the prevention and treatment of hypertension, obesity, nephritis has a very good therapeutic effect.

In addition to the medicinal value, people may be more in love with its flavor, such as "salt and pepper dragon lice", fried and then mixed with salt, the taste is quite good, the entrance to the chewing, the flavor of the strange incense, chewing the crunchy crunching, after swallowing the teeth and cheeks to leave a residual fragrance. The most famous is "and taste of dragon lice", the live dragon lice with boiling water for a few moments, let it drain the shit to the dirt, and then mixed with oil and salt, pickled for a period of time, to be dragon lice "taste", and then steamed into.

Also known as diving beetles (diving beetle) or true aquatic beetles (true water beetle). Coleoptera (Coleoptera) Dytiscidae (Dytiscidae) carnivorous, aquatic beetles, more than 4,000 species, prey on everything from insects to fish larger than themselves. Adult dragon lice are long-egg streamlined, flattened, smooth, with an arched dorsal surface and well-developed flattened setae on the hind legs. The antennae are filamentous, ***11-segmented, and the mandibles have shorter antennae. The common individual size is 10 to 20 millimeters, and some species can be more than 35 millimeters long . Adults and larvae of the dragon louse are mainly carnivorous, preferring to feed on insects, tsetse, small fish, tadpoles, etc. in the water, and some of them are also phytophagous and carrion-feeding. Adult lice have strong phototropism. When they see the light, they will fly high into the air and tend to the light source.