Arctic charr numbers in Windemere in the Lake District are falling and researchers want to know why.

A research project is aiming to find out why the population of a rare UK fish is declining.

The Freshwater Biological Association (FBA) plans to study the spawning grounds of Arctic charr in Windermere to determine the reason behind the fish’s falling numbers.

Although more common in Nordic countries, the Arctic charr is one of the rarest fish in England and its presence in the Lake District contributed to the area becoming a UNESCO World Heritage site in 2017.