TV chef Hugh Fearnley-Whittingstall said it was "vital" that the Government did more to protect UK seas as he led hundreds of campaigners in a march to Westminster in London.
The presenter has urged ministers to increase the number of "marine conservation zones" after more than £8 million was spent on identifying 127 areas where dolphins, seahorses and other rare species most need protection - many zones covering the south east and southern shorelines.
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The Foreign Secretary said "good connections" were important, and suggested the Channel Tunnel might simply be "a first step."
ITV News spent a day with a West Midlands ambulance crew to see first-hand the pressure they are under.