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.

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.

Hurrah! At last some good news for threatened Pacific tuna. Eight Pacific Island nations have signed an agreement to stop foreign fishing fleets taking their tuna. Our ship the Esperanza has been in the Pacific for the last seven weeks confronting unscrupulous foreign fleets that take 90 per cent of the fish, and even more of the profit.

Many of us are filled with a great sense of wonder and awe when we have the opportunity to experience the ocean. It can excite and calm, mystify and inspire. The ocean stimulates all of our senses. We can see it, hear it, touch it, smell it and taste it. We can completely immerse ourselves in it.

As much as I love tramping through rainforest, admiring mountain views, watching rivers meander through impressive landscapes and discovering all kinds of plants an animals on land... there's something about the ocean that grabs me every time I'm near it.

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Video: the discovery of Aaptos kanuux

Fascinating news just in - our two month research expedition to the Bering Sea last summer led to the discovery of a new species. Using manned submarines and a Remote Operated Vehicle, the crew of the Esperanza explored two of the world's deepest underwater canyons and took samples of never before seen life on the sea floor. Now, careful analysis has revealed one of them to be an entirely new species of sponge. Discovered in Pribilof Canyon, the new discovery is to be named Aaptos kanuux.

Our Executive Director John Sauven, writing for comment is free explains why tuna, once the 'chicken of the sea', is now at grave risk from overfishing.

The MV Esperanza confronts overfishing and pirate fishing in the Pacific.

Tuna, particularly the canned variety, has long been one of the UK's staple foods and most of us probably have a couple of tin or two somewhere in our cupboards. More recently, we've been developing a taste for raw tuna, as sushi bars continue to spread throughout the country.