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Released goldfish harm lakes and ponds (Level B2) — Several mandarin ducks swimming in a calm lake
29 Apr 2026

Released goldfish harm lakes and ponds

Researchers at the University of Missouri and the University of Toledo used outdoor experiments with artificial lakes to show that released pet goldfish stir sediments, reduce invertebrates, weaken native fish and can trigger hard-to-reverse ecosystem shifts.

Photo by Terence Zheng, Unsplash

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