The Arctic charr (Salvelinus alpinus) is a cold-water fish species found in some deep, glacial lakes in the UK, including areas in Scotland, the Lake District, and Snowdonia. A relic of the last Ice Age, it is one of the rarest freshwater fish in the UK, with populations adapted to unique, isolated habitats. Arctic charr are sensitive to environmental changes, such as warming temperatures and habitat degredation, making them an important indicator species for freshwater ecosystems. Their diet consists of aquatic invertebrates and smaller fish, and they are known for their striking coloration, particularly during the breeding season.
