We've long been aware of the environmental responsibilities you've got when you're in this kind of business. We only feed the salmon shrimp meal, and as far as stocking density's concerned, only one per cent of the volume of the cage is fish.

Fundamentals are just taking a back seat at the moment (to funds).

The market continues to be supported from a fundamental perspective by a combination of falling stocks and supply disruptions.

That would mean using a lot of electricity to pump sea water ashore and round the tank system. That would probably contribute to global warming. The fish would not strictly speaking be in its natural environment, because it would not be in the open sea. People want to produce food cheaply and this would simply increase costs by a huge amount.

There are no signs that funds have lost appetite. As long as you have a list of problems, funds will keep piling in.

They're suspended on a system of ropes, so catch the waste before it reaches the seabed. As we harvest them, they're tested to see how much of the waste nutrients they're absorbing. The seaweed is there to absorb dissolved nutrients and the shellfish to dispose of particles.