This is not a film about what might happen, this is a film about what has happened.The collapse of the cod population saw the end of 40,000 jobs; the bluefin tuna is being hunted to extinction; it takes five kilos of anchovies to produce one fish farmed salmon.And while there are some positive signs, with Walmart and McDonalds both selling fish from sustainable sources, some outlets still sell endangered species.But the final chilling conclusion is that unless more radical steps are taken globally, including the reduction of overfishing, it will take just 50 years for the world's ocean's to be all fished out.