According to the query of aquaculture network, Macrobrachium nipponense, also known as river shrimp, is a kind of freshwater shrimp with high economic value, which is widely distributed in freshwater lakes in China. It eats earthworms. In addition to earthworms, the main food of Macrobrachium nipponense includes all kinds of plant debris, plankton, rotten vegetables and rice grains. They often gather around docks, sluices, ponds, stone piles, rivers, roots and aquatic plants.

Earthworms are terrestrial invertebrates of Oligochaeta in Annelida, which are commonly found in humus and litter. They are cylindrical, with a length of 1 1-38 cm and a width of 5- 12 mm, all of which are composed of most links.