Grayling is a type of freshwater fish belonging to the family Thymallidae. They are known for their distinctive, colorful dorsal fin and sleek, elongated bodies. Grayling are typically found in cold, clear rivers and streams across parts of Europe, Asia, and North America. They thrive in well-oxygenated waters and are often sought after by anglers for their fighting ability and unique appearance. These fish primarily feed on insects, making them an important part of the aquatic ecosystem. Grayling can grow to about 20 inches in length and are recognized for their delicate, mild-flavored flesh. Conservation efforts are in place in some regions to protect their habitats from pollution and overfishing.