Boil prawns for 10~ 15 minutes. Wash bighead carp, put it in a pot and add water to boil, add ginger slices and onion segments, pour bighead carp, add appropriate amount of salt, and simmer for 10~ 15 minutes. The scientific name of Macrobrachium rosenbergii is Macrobrachium rosenbergii. Macrobrachium rosenbergii is an animal belonging to the genus Macrobrachium. The largest male can reach 400 mm, and after 1 year, it can reach150 ~ 200 mm. The frontal angle is long, and its length is often shortened with age. The end of the frontal angle exceeds the edge of the scale, and there is a cockscomb-like protrusion at the base. The upper edge of the back half has 12 ~ 15 teeth. The teeth in the comb are closely arranged, and the teeth in the second half are sparsely arranged.

Habitat:

Macrobrachium rosenbergii lives in fresh water from juvenile to adult, mature parent shrimps mate and hold eggs in fresh water, raise seedlings in salt water, and larvae develop in salt water. Macrobrachium rosenbergii requires high dissolved oxygen content in water and is intolerant of fat water. Generally speaking, dissolved oxygen is required to be above 5 mg/L, and the concentration of dissolved oxygen has a great influence on the feeding growth and feed efficiency of prawns, especially in the middle and late stage of culture, and the transparency of water body should be kept between 35 and 40 cm.