Update, December 2009: John West introduces new sustainability policy »

Last year we published our tinned tuna league table, ranking the main retailers and brands on the overall sustainability of their canned tuna. Tinned tuna, which is normally skipjack (the most common variety), is a food cupboard staple in the UK, and we are the second biggest consumers in the world, so we can have a massive impact on improving the sustainability of the fishing that fills the tins.

As well as assessing the information given on the tins (some didn’t even tell you what species was inside!) we also evaluated the impact of how the fish were being caught, and the company's overall sourcing policies.

This female Caribbean Reef Shark in Roatan apparently survived a finning - most do not © CC yukikokubo

Tesco have just announced that they're going to stop selling shark fins in their stores in Thailand.

This follows some bad press on the issue and subsequent lobbying by the Shark Trust to clean up their act.

Sharks are a dividing issue with people – some people love them and are fascinated by them, others are terrified of them. Whilst sharks have an ferocious and fearsome reputation, and any shark attack or alleged sightings of man-eating great whites off Cornwall make the news, we rarely hear of the impact we humans are having on sharks. And we are having an enormous impact.

A pollack called Colin... what's in a name?

Sticks and stones will break your bones, but names will never hurt you. Unless you're at the fish counter it seems, where the retailers Sainsbury's have 'renamed' pollack as 'colin'.

No, it's not April Fools' Day - apparently customers had a bit of an issue asking for pollack. I guess in much the same way as Uranus started being pronounced 'Yoo-ran-uss' at some point in the last couple of decades to avoid embarrassment and puerile jokes.

Last week, Sainsbury's announced that it aims to use only sustainable palm oil in its own-brand products. Sounds great, and with Asda having made a similar announcement earlier this year, you might think supermarkets will soon be stocking only those palm oil products that weren't helping to cause the indiscriminate destruction of forests in places like Indonesia. The truth is that, while both companies score top marks for excellent intentions, delivery is going to be decidedly tricky as there is currently no credible way of telling whether palm oil is 'sustainable' or not.