This article was amended on 2 April Pinterest A salmon farm in Scotland run by Marine Harvest, one of the largest seafood companies in the world. It could farm 2m fish at a time, and create as much waste as a city the size of Glasgow. People have to judge carefully the environmental and health issues. The smart money is now on breeding wrasse, a small fish that eats lice. These range from pumping the fish through water hot enough to make the lice let go of their hosts, to churning them as if in a washing machine.
The good news is that both farmed and wild salmon have very low levels of mercury, PCBs and other contaminants. These range from pumping the fish through water hot enough to make the lice let go of their hosts, to churning them as if in a washing machine. There are a few good organic ones that claim to have addressed all the problems. It is environmentally, socially and economically bankrupt. New scientific studies showed this week that fish farms may be depleting wild wrasse numbers too, and to breed enough for all Scottish farms could take four or more years, says Landsburgh. It could farm 2m fish at a time, and create as much waste as a city the size of Glasgow. Other papers showed that the levels of chemicals used to kill sea lice have breached environmental safety limits more than times in the last 10 years. Most UK production is carried out by six Norwegian companies. Support is growing for an investigation into the links between the industry and government. Last month Staniford unearthed the fact that not only was the use of the toxic drug emamectin rising fast, but also that the industry had persuaded the Scottish environmental protection agency to withdraw a ban planned for next year. The smart money is now on breeding wrasse, a small fish that eats lice. Most fish farms are overcrowded, but we are not. Last year the heating of the water on a Skye fish farm led to the accidental slaughter of 95, fish. But this would add greatly to industry costs and require investments of billions of pounds. But even using wrasse is not a complete answer. Both are condemned by animal welfare group Compassion in World Farming, and are known to be expensive and not always effective. Some chemicals will be banned soon, and unless something significant happens, the industry will have to invest very heavily. Another 20, died in another incident. The chemicals have been discharged into the waters by 70 fish farms run by seven companies. This is yet more evidence that the chemical warfare waged by fish farms against sea lice has essentially been lost, and the application of toxins to kill them is spiralling out of control. This article was amended on 2 April It is highly worrying that they have been breached so many times. Export markets are led by the US, which bought 30, tonnes in It is being widely piloted and is highly promising, says Landsburgh. The louse is a hardy parasite.
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