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indeed fish. However, under certain circumstances, you can use fishes as the plural form of fish. If you, for example, see two trout swimming together, you could say that you’re looking at fish. However, if the two trout were joined by a salmon, you could describe them as fish or fishes. Fish can refer to multiple fish, especially when they are all the same species of fish. Fishes, however, usually refers to multiple species of fish, especially in scientific contexts.