Lough Neagh is the largest lake by area in the British Isles. It supplies 40% of Northern Ireland's water and today it is home to the Lough Neagh wild eel fishery. The Lough Neagh Fishermen's Co-operative sell most of the eels they catch here to markets in Holland or London but they also try to encourage local people to enjoy this delicacy. Helen Mark joins the crew onboard for the first fishing trip of the season and discovers the history and folklore which surround this stunning but sometimes treacherous piece of water.