The hook on the caudal appendage of C. pengoi often becomes tangled in fishing gear, fouling the equipment. In addition, C.
pengoi competes with fish for food, and high populations of this species may reduce the number of fishes in a water body. Further, the fishhook water flea may intensify the eutrophication (overgrowth of algae resulting from an increased supply of nutrients) of water bodies by eating zooplankton that would normally graze on the algae. ♦
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