Procottus major is a species of ray-finned fish belonging to the family Cottidae, the typical sculpins. This species is endemic to Lake Baikal in Siberia. It was originally described as a subspecies of the similar but smaller red sculpin (P. jeittelesii). P. major can be found at depths of up to 900m (3,000feet), especially on a muddy or rocky-mud bottom.[1] In the spring and summer it typically occurs deeper than 100m (300feet), and in the fall and winter from 30to(-).[1] It can reach a length of 30cm (10inches), but is usually NaNcm (-2,147,483,648inches).[1] It feeds on smaller animals, especially gammarids, and breeding occurs in the winter at depths of 60-.[1] This species is fished and its young are an important food source for other fish.[1]