We're told a lot of things from a lot of different sources (NHS, eat healthy school programmes, glossy magazines, news features, health food stores, supermarket meal recipe cards, product labels) about what a balanced, healthy diet is. Fish is pretty high up on the list of healthiest foods to eat. High in the omega oils, protein and low in saturated fat, fish is classed as a ‘super food' as far as the nutritional hierarchy of food goes.

But now we also need to consider the impact our food choices are having on the environment. Just as soya, cattle and palm oil (vegetable oil) are now seen by many ecologists as a poor choice when it comes to deciding how we use our land for food, fish may soon be in the same category. The new documentary End of the Line by investigative reporter Charles Clover and film director Rupert Murray brings to light the devastating effect of over fishing.

According to scientists in the film we could see the end of most seafood by 2048 if we continue fishing as we are now. End of the Line investigates fishing in all parts of the world. It looks at the decimation of cod in areas it was once abundant before demand sourced for the oily fish. It looks at the effect of hi-tech fishing boats on our ocean sea floors, fishermen who break quotas and fish illegally and consumers who, without realising, are buying endangered species of fish.

The film also looks at solutions. Farmed fishing is not one say the experts. Protecting our ocean with marine reserves that are off limits to fishing and educating consumers so they will choose fish caught in certified sustainable fisheries are a couple of things the film highlights.

‘We must stop thinking of our oceans as a food factory and realize that they thrive as a huge and complex marine environment,' says Clover.

The Economist called End of the Line the ‘Inconvenient Truth about the oceans'. The makers say it is a film that will change the way you think about seafood. We say imagine the world without fish. Watch this film, find out what's really happening in the deep blue and make good fish buying choices - for a healthy diet and a healthy planet.

The film's website can help with choosing the best ocean-friendly seafood to buy. You can also sign up to the End of the Line campaign to buy sustainably sourced fish and protect the oceans from the commercial fishing industry.