The bighead sculpin (Batrachocottus baicalensis) is a species of sculpin fish that is endemic to the Lake Baikal watershed in Siberia, Russia. It typically lives on rocky bottoms, often in places with sponges, at depths of 5to(-), but can occur as deep as 120m (390feet).[1] Its colour varies from grayish to brownish or greenish depending on the bottom type.[1] It can reach up to 22cm (09inches) in length, but most are NaNcm (-2,147,483,648inches).[1] It feeds on a wide range of smaller animals such as young fish, insect larvae, amphipods, molluscs and oligochaetes.[1] Breeding is in the spring where the female lays 618 to 1622 eggs, which are guarded by the male.[1]
The bighead sculpin is variously considered to belong either to the family Cottocomephoridae, Cottidae[2] or Abyssocottidae.[3]