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.

The whalers' factory ship Nisshin Maru leaving Innoshima on Monday

Japan's whaling fleet slunk out of port earlier this week under a cloud of financial crisis and scandal, with none of the elaborate parades and marching bands of previous years' departures. This time the Nisshin Maru left the port of Innoshima with no triumphant fanfare, after the cancellation of the usual traditional departure ceremony in its home port of Shimonoseki. Word has it that this time, only a small group of 30 or so saw the whalers off - along with a hardy bunch of activists who protested with banner saying "whaling on trial" and one highlighting the whaling operation’s multi-million dollar drain on Japan’s taxpayers.

The past few weeks have not been good ones for the whalers - first of all was the deflagging of the support ship Oriental Bluebird. Japanese newspapers reported that, for the first time since the nation began 'scientific' whaling in the 1980s, the self-appointed quota would be decreased. Then we heard of the announced closure of Yushin (Toyko's largest whale meat shop), and news that for the first time, the whaling ships wouldn't be 100 per cent crewed: many former crew members were reluctant to sail again, following the whale meat scandal uncovered by a Greenpeace undercover investigation.

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.

Yushin, Tokyo's official whale meat shop, is closing down © Dave Walsh

Probably better to whisper it at this point, at least if you're a bit superstitious like me, but it has to be said that our much criticised plan to focus all our anti-whaling efforts in Japan, rather than out in the Southern Ocean, is beginning to yield significant results. Even before the whalers prepare to leave port for their annual hunt in the Southern Ocean Whale Sanctuary, new revelations of financial and image problems are adding to the woes of the scandal-plagued industry.

Greenpeace Canada exposed the country's largest grocery store chain's claims to be a 'green' grocer as false this week, after an investigation into how they source their seafood. Loblaws, whose stores account for nearly a third of all groceries sold in Canada, were found to be selling 14 of the 15 species on Greenpeace's 'Redlist' - made up of those species that are most destructively fished or farmed.

To get 'redlisted' a species must be in serious trouble, usually defined as facing a 90% reduction in numbers. Currently top of the Canadian list are Atlantic bluefin tuna, Atlantic cod, sharks, skate, shrimp and orange roughy - all of which are sold by Loblaws.

Oriental Bluebird, left, refuels the whaling factory ship Nisshin-Maru in the Southern Ocean Whale Sanctuary, 2007

The Japanese whaling fleet's key supply vessel, Oriental Bluebird, has been de-flagged and fined following a legal ruling by Panamanian authorities, where the ship is registered. The owners of the former oil tanker, used to refuel the fleet in the Southern Ocean and to ship whale meat back to Japan, were fined the maximum penalty after being found guilty of:

• using the ship for purposes it was not licensed for (ie carrying whale meat rather than oil)
• violating the MARPOL convention (a treaty designed to eliminate the deliberate, negligent or accidental release of oil and other harmful substances from ships into the marine environment) after illegally refuelling whaling vessels in Antarctic waters.

Moules marinière à la Michelin-starred Raymond Blanc

Let's face it, even if you're Raymond Blanc, buying the right fish these days is not so simple.

And right now many of our traditional favourites, from cod to tuna, are disappearing rapidly from the seas due to overfishing and the effects of climate change. Bottom-trawling boats are sailing farther and fishing deeper than ever before, hauling in hordes of fish with heavy, weighted nets that tear up the ocean bottom. Read more »

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.

Entries at the Milan Sushi Awards earlier in the year (image by Thomas Lu, licensed under Creative Commons Attribution 2.0)

Working at Greenpeace often means that I find myself in some unusual places - inside a nuclear power station, atop an aeroplane or in a palm oil factory. But I certainly never expected to find myself at an international sushi awards ceremony.