Hugh Fearnely Whittingstall leaves the comfort of River Cottage to examine Britain's fishing industry. He ask why so much fish is thrown back into the sea dead, why so little of the UK catch is sold here, and exploes the supermarket claims about the fish they sell.
So great is the impending fish crisis that scientists believe this food source may become non-existent for future generations.
Hugh asks how much fish is left in the sea and discovers which fish should be eaten, and which should be left alone to replenish. Hugh focuses on the three species most widely consumed in the UK: cod, salmon and tuna. Armed with the relevant information he takes his fish fight to the politicians, the general public and the supermarkets.
Hugh goes to the Philippines to witness fishermen dynamiting fish, and discovers how this practice has decimated fish stocks.
Off the Isle of Man he goes underwater to see the destructive effects of scallop dredging, and sees how marine protected areas are helping the recovery of the island's waters.
And Hugh launches his new campaign on the sands at Weston-super-Mare, with a dramatic public display of what is at stake if we don't look after our seas.
Hugh goes to the southern oceans to witness the high-tech fishing practices targeting the tiny krill.
Hugh travels further than he's ever been before, close to Antarctica and one of the last significant patches of sea not already being overrun with fishing boats.
But even here, he discovers a high-tech fishery that is targeting krill, the tiny shrimp-like crustacea at the bottom of the food chain that is being fished for feed that helps turn salmon pink, and also as krill oil tablets - part of the increasingly lucrative health food market for omega 3 products.
South Georgia, a haven for wildlife, is governed by the British. This means that it is the British Government who decide how much of this sea to protect.
But will they listen to Hugh as he pushes them to set up a bigger protected area around this extraordinary patch of sea?
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?