MacKenzie makes an excellent point for the rest of us. ???When I was young,??? he tells me, ???fish such as salmon and shrimp were posh treats, but now they are really common commodities that you can get in a sandwich at Tesco. ???We have cheapened fish over many generations into something people think is easy to get, inexhaustible, and of course it isn't.??? For me it is become a rare treat again an