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In page Cypriniformes:

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The most notable family placed here is the Cyprinidae (carps and minnows), which make up two-thirds of the order's diversity. This is one of the largest families of fish, and is widely distributed across Africa, Eurasia, and North America. Most species are strictly freshwater inhabitants, but some are found in brackish water, such as roach and bream. At least one species is found in saltwater, the Pacific redfin, Tribolodon brandtii.[2] Brackish water and marine cyprinids are invariably anadromous,[citation needed] swimming upstream into rivers to spawn. Sometimes separated as family Psilorhynchidae, they seem to be specially adapted fishes of the Cyprinidae.[3]