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The "farming" of fish, either in fresh-water lakes and streams, or in cages kept in sea water.

Many experts have health worries about non-organic fish reared in this way. The main causes for concern are -

1. The strong chemicals often used to control parasites, which attach themselves to the fish, because of their less than normal activity. This is particularly worrying in the case of sea lice on salmon. Organic farmers have partially overcome this problem by including wrasse in the salmon cages, they naturally trim the lice off the salmon.

2. Other man-made chemicals (such as PCB pesticides), which leach into the sea from the land, but are stored in the flesh of the fish - this again is particularly worrying in types of fish with a high fat content, such as salmon.

3. The fact that to produce their food, it takes three times the weight of caught wild fish to produce one farmed fish - so effecting world fish stocks, often in poorer areas of the world, where these fish might be a food staple.

4. The environmental damage caused by fish waste, which falls under and around cages. The seabed becomes bereft of vegetation and wild life where ever fish farms are introduced.

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