Sainsbury's, the supermarket that sells the largest amount of fish, recently agreed to stop offering skate and huss, both of which are endangered. Its skate sales have been worth £650,000 a year. M&S delisted these fish a few years ago. "Supermarkets play a huge role in shaping how our fisheries and fish farms are managed," MCS fisheries officer Bernadette Clarke said. "While most responsible retailers are making an effort to remove all overexploited and biologically vulnerable fish from their shelves, others continue to sell them."

The MCS has been putting pressure on supermarkets to remove from sale fish whose stocks are most at risk and records some progress since last year.[/quot...

Sainsbury's, the supermarket that sells the largest amount of fish, recently agreed to stop offering skate and huss, both of which are endangered. Its skate sales have been worth £650,000 a year. M&S delisted these fish a few years ago. "Supermarkets play a huge role in shaping how our fisheries and fish farms are managed," MCS fisheries officer Bernadette Clarke said. "While most responsible retailers are making an effort to remove all overexploited and biologically vulnerable fish from their shelves, others continue to sell them."

The MCS has been putting pressure on supermarkets to remove from sale fish whose stocks are most at risk and records some progress since last year.

I find it amazing, that endangered species are still being sold at all. People really need to think before they buy. We cannot rely on adequate and responsible labelling either. It's sometimes so hard to keep up though. They don't make it easy.
http://www.guardian.co.uk/environment/2006/mar/01/food.supermarkets