Rare footage shows how the population of the 'world's most expensive fish' Bluefin tuna has boomed off Britain

Incredibly "special" footage of world's most expensive fish in the Channel Islands shows a return bluefin tuna to UK waters - after disappearing for over half a century. The beautiful video, taken by Matthew Stockreiter in collaboration with environmental organisation Wild Islands, includes slow-motion clips of the fish gliding through the water near Guernsey. The shot is just one of a compilation put together as part of a wildlife documentary by Guernsey-based Wild Islands, called 'Wild Islands: The Blue.' Based in the Channel Islands, the documentary has been created by Anthony Ford-Marsland, Matthew Stockreiter and Pierre Ehmann. In their first film, the group are delving into the seas of the Channel Islands to discuss conservation and marine life, whilst exploring our seagrass meadows, dolphin pods and tuna populations. Guernsey-based cinematographer, Matthew Stockreiter, explains he captured the footage on a trip to see tuna bait balling. He said: "We were out on the boat for hours trying to actually find them. "Obviously I shot in slow motion, but in real-time speed they are pretty much like torpedoes." The highest price for a single bluefin tuna cost sushi magnate Kiyoshi Kimura 333.6 million yen - £2,022,784 - in 2019. According to the WWF, bluefin are the largest tunas and can live up to 40 years. They migrate across all oceans and can dive deeper than 3,000 feet. With retractable fins and eyes set close to their body, they are built like torpedoes and are a species made for speed. There are three species of bluefin: Atlantic (the largest and most endangered), Pacific, and Southern, and most catches of the Atlantic bluefin tuna are taken from the Mediterranean Sea - which is the most important bluefin tuna fishery in the world.