Top five fish to avoid
Seabass from the central and south North Sea, the Irish Sea, English Channel, Bristol Channel and Celtic Sea. The MCS say it is overfished.
European Eel from the north-east Atlantic is critically endangered.
Atlantic Salmon from the north-east Atlantic, where it is a threatened and declining species.
Southern Bluefin Tuna has been heavily overfished around the world in the past. The International Union for Conservation of Nature says it is critically endangered.
Uncertified prawns (king) from uncertified farms, which cause environmental damage through poor regulations and big disease outbreaks.