Hugh examines the farmed prawn industry in Thailand and a successful marine renewal scheme in Dorset. He launches his new campaign with a bold rally outside the Houses of Parliament. Thailand is the biggest supplier of farmed king prawns to the UK. Hugh sees first-hand how fish stocks are being depleted in order to feed the voracious appetites of these prawns. Huge quantities of 'trash fish' are being ground into fishmeal. But are Britain's big supermarkets taking this issue seriously? Hugh sees the recovery of the seabed that is taking place in a Marine Protected Area (MPA) in Lyme Bay. The good news is that the British Government has plans for a network of new MPAs around the coast. But the plans are already being diluted, and they'll need huge public support if they are going to come into being. Hugh kicks off his new campaign with a bold public rally outside the Houses of Parliament. Can the Fish Fighters persuade the government to Save Our Seas?