Environmental impacts of aquaculture
Over fishing of food species
The wild fish that are caught to make food for the framed fish, such as sand eels, can become overfished. The other species that feed on them, such as puffins may starve. Fishing for the food species may also cause habitat damage.
Natural predators such as seals may be culled if they become pests. They use better cages to exclude predators to reduce the need to cull.
Such as Fish Lice are more common in densely populated cages. These may tranfer to wild fish that are more likely to suffer infected wounds as they cant get treated with antibiotics or for lice.