2. The snakehead fry with a body length of less than 3 cm mainly eats mosquito larvae, while the snakehead fry with a body length of 3-8 cm can eat small insects, tadpoles, shrimps, fry and so on.
3. Adult snakehead with a body length of more than 20 cm especially likes to eat all kinds of small fish and juvenile fish such as crucian carp, rice strips, loach and frog, and will prey on the same kind when they are extremely hungry.
4. In the artificial feeding environment, besides animal bait, snakehead can also eat artificial compound bait such as bean cake and fish meal. When the water temperature is high in summer, snakehead eats more. When the water temperature is lower than 12 degrees, snakehead will stop feeding.
5. Ophiocephalus argus usually inhabits the waters with overgrown aquatic plants or muddy sediments, and is distributed in rivers, lakes, reservoirs, ponds, paddy fields and other waters, and has strong adaptability to environmental factors in water, especially dissolved oxygen, water temperature and water quality. When the water is short of oxygen, it can breathe on the water with the help of the auxiliary respiratory organs of the suprabranchial cavity. Snakehead can survive at 0~4 1℃, and 16~30℃ is the optimum temperature for its growth, development and reproduction. When the water temperature returns to above 8℃ in spring, it generally moves in the middle and upper water bodies; In summer, snakehead mostly moves in the upper water body; When the temperature is lower than 6℃ in autumn, snakehead swims slowly and often lurks deep in the water layer. When the water temperature is close to 0℃ in winter, it will be buried in the mud for the winter. Because snakehead has strong jumping ability, it often runs away. Hot weather, rain impact and rising water level will all cause snakehead to escape.