Mussels are often raised on ropes submersed in coastal areas, a system considered to be one of the most environmentally friendly forms of aquaculture. They are also bottom cultured and harvested by dredging, which can degrade sediment and cause a decline in biodiversity. However, dredging cultured beds causes less damage than dredging natural ones. Although they are filterfeeders that improve water quality, mussels will only thrive in a healthy environment. Harmful algal toxins in the water have caused some mussel farming areas to be closed temporarily.
Mussel farms tend to be protected from duck predators with fine mesh that is heavily weighted to avoid problems there with entanglements.