oceans

There's a well-known model of how dodgy big business deals with campaigns against them. To summarise, it goes a bit like this:

• Company X gets some bad press for doing something wrong, especially bad press if it kills lots of charismatic megafauna;
• Company X initially retaliates saying, 'It's all lies, honest';
• Company X then admits it isn't all lies, but comes up with some way of kicking the issue into the long grass, usually some commission or foundation (ideally with a word like 'conservation' or 'sustainable' in its title) or some interminable period of gathering research, in the hope it all blows over and people forget what they were upset about.

An ex-bluefin tuna found during the Rainbow Warrior's previous visit to the Mediterranean in 2007 © Greenpeace/Care

Imagine you are an Atlantic bluefin tuna. You've been out at sea most of the year in cooler waters, feeding away and generally getting on with being a big ol' fish at the top of your food chain. You have not a care in the world, save the occasional orca or shark scare.

Then spring is sprung, and the urge takes you. Forces you don't really understand compel you to head back to warmer waters, and a certain key place, sacred to you bluefin. The bluefin equivalent of a romantic dinner and some subdued lighting is a sheltered warm sea, and conditions have to be perfect, or it ain't happening. But even that's not enough. Because of the, er, messy, way most fish reproduce, they congregate together, and only release sperm and eggs when the time and the temperature is right: 23 degrees Celsius. It's the perfect temperature for a bluefin love-in.

When good things go bad: a purse-seine in action

Greenpeace is not against purse-seining, which may surprise some people. Sure it's a big industrial-looking fishing operation, involving huge nets and catching lots of fish. But that's not always a bad thing.

If we are to assume we're still going to catch and eat fish, then purse-seining as a method is probably going to be something that continues. Purse-seining involves setting a large circular wall of net around fish, then 'pursing' the bottom together to capture them. Where purse-seining is best used is with large single-species schools of fish, that shoal tightly together. Examples like herring or mackerel spring to mind. These can be caught relatively 'cleanly' by purse-seining.

Ever wondered what this ocean acidification thing is? Wonder no longer, as this new animation from our international office explains everything you need to know in just over a minute. 

The basic upshot is that climate change is not just making the oceans warmer, it's also making them more acidic. It's only by a relatively small amount so you won't lose your toes if you go paddling, but the effects on the ocean's chemistry is dramatic. Most widely reported is the threat this poses to coral reefs - as the water becomes more acidic, the polyps aren't able to create the calcium carbonate skeletons which form the reefs.

The consequences travel up the food chain - watch the video to find out more.

The Chinese river dolphin is just one of the thousands of species lost in recent times (© Idolector)

The great Douglas Adams once said: "I love deadlines. I love the whooshing sound they make as they fly by." He was no doubt talking about writing deadlines but another deadline is fast approaching, one Adams would have been very interested in and one which is far more significant than whether a manuscript gets delivered on time.

Back in 2002, parties of the Convention on Biological Diversity (CBD) - or in other words, most nations on the planet - agreed on a target to stem the loss of biodiversity by 2010, which by no coincidence is also the International Year of Biodiversity. There are still more than six months to go before that deadline officially expires but the results of the global efforts already being called and it's not good news.

The past few days have seen a couple of pretty important meetings in Spain about the reform of the Common Fisheries Policy (the CFP). You might not have seen much coverage, which isn't that surprising when there's an election going on, nor when you appreciate that very few people know what CFP stands for. Amongst fishy circles, the acronym is often re-interpreted, but I'm too polite to say what the F would stand for.

The breaking news today is that governments at the CITES meeting at Doha have voted AGAINST a trade ban on Atlantic bluefin.

Words cannot express how frustrating this is. The science and scientific backing is incontrovertible. The public will and pressure is immense. The species could be  commercially extinct within just a few years.

Tension is rising as round two of the Tokyo Two trial starts today in Aomori, Japan, where Greenpeace activists Junichi Sato and Toru Suzuki are on trial in Japan for their role in exposing major corruption in the government funded whaling industry. This week they get to give evidence for the first time, and the whistleblower who alerted them to the embezlement scandal will also take the stand. Watch the video above for an update on the story so far...

You know, I wouldn’t be surprised if somewhere someone decided to name a roller-coaster 'bluefin'. The ups, downs, twists, and turns are certainly hard to follow in this fish's political fortunes, and at the end it could end up making us all feel quite sick.

Post the farcical ICCAT meeting we have seen a follow-up meeting of ICCAT’s Pacific counterparts, whose jolly gathering in Tahiti showed a similar lack of ability and spine when it comes down to making useful or necessary decisions.

Bluefin tuna - sometimes you just can't believe how absurd the story gets.

News today from WWF and a Green MEP show that over an eight-year period the EU bluefin tuna fishing industry received subsidies totalling €34.5m. Yes folks, your tax helped fund the overfishing of a species now teetering on the very brink of extinction. A species that 21 out of 27 EU countries now think should be subject to an international trade ban.