Gold fish.

Shiny but deadly – don't throw goldfish in rivers, pet owners told, Invasive species

Gold Fishes

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12 Types of Goldfish To Consider for Your Aquarium

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17.5. Goldfish Aquarium

All About Goldfish – How to Care for a Goldfish Fish at Home - Aquarium Tidings

Though Cute as Pets, Goldfish Are Highly Invasive Once in the Wild, Smart News