TV chef Hugh Fearnley-Whittingstall led a march to Westminster today to urge the Government to do more to protect UK seas.
Accompanied by hundreds of supporters - many in fish-related fancy dress - Mr Fearnley-Whittingstall said it was "vital" that ministers act to increase the number of "marine conservation zones" (MCZs).
More than £8 million was spent on identifying 127 areas where dolphins, seahorses and other rare species most need protection. The Department for Environment, Food and Rural Affairs has so far planned to create 31 sites by the end of this year, while the majority of MCZs have no timetable.
Speaking outside parliament, Mr Fearnley-Whittingstall said:"This is the sort of opportunity that may not come again. We might not have such a vital and appropriate time frame as we've got right now to make real changes.
"If we leave it too much later, too much damage will have been done. It will be hard for a lot of the areas to recover."
Celebrity chefs Jamie Oliver and Hugh Fearnley-Whittingstall have criticised "cynical" supermarkets for paying farmers less for a litre of milk and urged the public to boycott the retailers accused of harming the dairy industry.
In a letter to The Times (£), they wrote: “Milk is a brilliant food, but we have lost all sight of its value. We pay more for bottled water than we do milk - yet water bubbles out of the ground, while milk comes from livestock that need our care. How mad is that?”
Criticising supermarkets that do not pay a fair price for milk, they added: "If they won’t take that initiative, then perhaps consumers will consider moving their custom from those who offer milk at crazy, knock-down prices to those who will commit to giving dairy farmers a fairer deal.”