Metynnis is a genus of South American freshwater characiform fishes in the family Serrasalmidae, widely known among aquarium keepers as silver dollars for their rounded, laterally compressed bodies and bright metallic sheen. Species in this genus are generally peaceful schooling fishes with strong herbivorous tendencies, using plant matter, algae, seeds, and other vegetable-based foods as important parts of their diet in river and floodplain habitats. Understanding Metynnis highlights the diversity of serrasalmid fishes beyond predatory forms, the ecological role of plant-eating characins in South American waters, and the importance of spacious aquariums, stable water quality, and vegetable-rich feeding for maintaining their natural behavior, health, and graceful group swimming.
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