At first, platypus was mainly fed with zooplankton (such as red worms), and then gradually domesticated and fed with floating granular bait. Duck-billed fish is a kind of filter-feeding fish. Its main food is zooplankton and cladocera, especially water fleas, and occasionally small aquatic insects such as chironomid larvae. Duckbill fish has strong adaptability, rapid growth, docile temperament and short food chain, and is the only fish that feeds on zooplankton among all sturgeons.