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.

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.

Yesterday at 3pm local time the Esperanza departed from Hobart in Tasmania, Australia bringing to a close the 2007/2008 Southern Ocean Expedition. The ship had arrived on Sunday evening to a great welcome from the people of Hobart, including the mayor and a number of councillors.

After spending close to two months tracking the Japanese whaling fleet, Esperanza was forced to leave the Southern Ocean Whale Sanctuary last week when her fuel supply started to run out. The sanctuary had remained fatality free for the whales during the previous fortnight while the Espy chased the factory whaling ship, the Nisshin Maru, across 5,000 miles of the Southern Ocean.

A Greenpeace inflatable prevents the Nisshin Maru from being refuelled by the Oriental Bluebird © Greenpeace/Jiri Rezac

A few days ago, the Esperanza - which had been pursuing the Japanese whaling fleet for two weeks - was forced to quit the chase and head back to port as the ship is running low on fuel. But this year's Southern Ocean expedition has been a resounding success.

After eleven days successfully preventing the Japanese whaling fleet from killing whales in the Southern Ocean, the crew of the Esperanza were this morning able to inconvenience them still further by delaying the refuelling of their factory ship, the Nisshin Maru.

Here's the latest video update from Esperanza, on patrol in the Southern Ocean Whale Sanctuary protecting fin and minke whales from whalers, plus a blog update from Dave, our intrepid onboard webbie:

Greenpeace campaigner Sakyo Noda contacts the Japanese whaling fleet

Good news from Esperanza, our ice-class vessel on patrol in the Southern Ocean Whale Sanctuary. Yesterday the Espy had a face to face encounter with the Japanese whaling fleet's factory vessel, the Nisshin Maru, which was confronted close to the ice edge. As soon as they realised that we were in the area, the whalers put on speed and tried to get away.

After a high speed chase over hundreds of miles through fog and increasingly rough seas (see video clip below), the Esperanza this morning pursued the whalers north of the over the 60 degrees latitude mark - out of the Southern Ocean hunting grounds. The catcher vessel Yushin Maru also followed suit.

MY Esperanza arrives in Sydney, Australia

We're taking our anti-whaling campaign to Japan, where the government plans to increase its whaling activities despite opposition from two-thirds of the Japanese public.

Ace underwater photographer and videographer Gavin Newman has been a regular guest onboard our ship the Esperanza as it travelled the globe in 2006 "Defending Our Oceans ". Gavin has put together some of his favorite images and talks about his experiences over the last year in this flash piece: From behind the lens: Defending Our Oceans in 2006.