In fact, there are many kinds of river shrimps, mainly referring to China crayfish, Japanese Macrobrachium nipponense and black shell shrimp. Among them, Macrobrachium nipponense and Macrobrachium China belong to carnivorous shrimp, while Macrobrachium japonicum belongs to phytophagous shrimp. When catching in outdoor cages, animal proteins with pungent smell, such as chicken and duck intestines, pig liver, carrion and rotten fish, can be put into cages to mainly trap carnivorous shrimp. Fill the cage with aquatic plants to catch black shell shrimp.

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