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Coastal fish farms seem to do less harm to nearby plants and animals than previously believed, a new study . And marine ecosystems can from this damage fast. But the analysis of a single trout farm in a Faroe Islands fjord over nearly a year also shows that these facilities need to be carefully, and that there’s a limit to how many can operate in a particular area before its biodiversity suffers lasting harm. In coastal farms, fish live in large cages hanging from pontoons on the surface. Fish feces and uneaten food sink to the seabed, affecting its ecosystem. Badly-managed farms can also have serious effects on the surrounding water column.