Imagine you were in a car that was rolling quickly towards the edge of a cliff. The sensible thing to do would be to slam on the brakes as much as possible, knowing that it will take some time to stop, even with your best efforts and your foot to the floor. Another option would be just to take your feet off the pedals and hope it slows down in time. If it was an EU fisheries regulator who found themselves at the wheel, though, chances are they'd consult widely to ensure that they had the best advice possible on how to get out of the situation, and then totally ignore it...

All the available data shows that many fisheries around the world are in serious decline. Some face complete collapse (hence the 'falling off a cliff' analogy) unless drastic action is taken to end over-fishing and give threatened stocks time to recover. This can only happen by setting aside large areas of ocean as marine reserves, off-limits to all forms of fishing. But sadly the fishing industry itself still seems incapable of taking any meaningful steps to address the problem.

OK so I'm a day or two off the pace with this story (courtesy of a long weekend - well even we need a day or two off once in a while), and didn't find out about Monday's tuna direct action in Paris until I showed up at the office again today. So what did I miss? Well, our French colleagues took the opportunity to protest against France's leading role in decimating Mediterranean bluefin tuna stocks by dumping five tonnes of tuna fish heads outside the door of the French Fisheries Ministry.

Timed to coincide with coincide with the opening of the annual meeting of the International Commission for the Conservation of Atlantic Tunas (ICCAT), in Marrakech, the action targetted France (as opposed to Italy or Spain, the two other worst offenders) in this instance because French Premier Nicholas Sarkozy currently holds the EU presidency. He has been using it to shape the EU position in favour of the short-term interests of his fishing industry above the need to save the Mediterranean bluefin tuna stock from collapse.

Latest updates from the impressive ProtectPlanetOcean web site provide convincing support for Greenpeace's long-held contention that marine reserves provide the best long-term solution to the problems of overfishing and pollution which threaten the world's marine ecosystems. In case you've forgotten marine reserves are protected areas, national parks at sea where no fishing or other extractive industries (such as oil, gas or gravel extraction) are permitted.

The site has pulled together studies of 124 marine reserves around the world - scientific peer-reviewed research published in academic journals - to provide a clear picture of what has happened where reserves have been established.

Our oceans are the last global commons, and as such are about as effectively regulated as Dodge City when the West was at it's wildest. As recently as 40 years ago they were considered to be an inexhaustible resource. No amount of fishing could possibly make a dent, it seemed, in the teeming mass of ocean life which constantly replenished itself. It was a one-sided arms race, with increasingly advanced fishing techniques maximizing catches: GPS; sonar; trawl nets big enough to catch a jumbo jet; bottom trawling; fish aggregating devices and open-water 'ranching' are just some of the methods employed to extract maximum profit from the seas.

The crew of the Prolific discarding their catch

So at last the sheer waste involved in modern trawling has been captured on camera. Last week a Norwegian coastguard cutter filmed the crew of a Shetland trawler, the Prolific, openly dumping over 5,000 kg of cod and other dead white fish in UK waters. Now this footage is rightly causing a wave of revulsion in the media at the scale of unnecessary waste at a time of rapidly rising food prices and, ironically, when our own Prime Minister is telling us not to waste food.

Our 25 metre long 'No Fish No Future' banner looks tiny alongside the giant Albatun Tres

After last week's good news about Pacific Island nations banding together to stop foreign fishing fleets decimating their tuna stocks, the crew of Esperanza yesterday took action against the biggest and most devastatingly efficient tuna catching vessel in the world, the Spanish owned purse seiner Albatun Tres.