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Can mayfly nymphs survive in brackish estuary water?

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A mayfly (Ephemera vulgata) with delicate, veined wings and long tail filaments clings to a green blade of grass against a blurred green background. — mayfly An adult mayfly (*Ephemera vulgata*) in Europe.

Yes, while mayfly nymphs are primarily distributed in freshwater environments, a few species are capable of tolerating the brackish water found in marine estuaries.1