Bull Rout

The Bull Rout (Myoxocephalus scorpius), also widely known as the shorthorn sculpin or short-spined sea scorpion, is a bottom-dwelling fish in the sculpin family, Cottidae. It is distributed across cold and cool waters of the North Atlantic and Arctic, including the coasts of Britain, Scandinavia, Greenland, and northeastern North America. Bull Rout is a common inhabitant of rocky shores and tide pools, where its mottled, camouflaged appearance helps it blend with the substrate. It is not of conservation concern and remains abundant across its wide cold-water coastal range.

Identify the Bull Rout by:

• Large, broad, flattened head armed with short spines and ridges
• Tapering, scaleless body reaching roughly 15-30 cm, occasionally larger
• Mottled brown, green, and cream camouflage pattern that varies with habitat
• Wide mouth and large eyes set high on the head
• Large, fan-shaped pectoral fins
• Two dorsal fins, the first shorter and spinier

Its short head spines distinguish it from other sculpins such as the longhorn sculpin, which has notably longer preopercular spines.

Bull Rout inhabits cold, rocky coastal waters throughout the North Atlantic and Arctic, including the shores of the British Isles, Scandinavia, Iceland, Greenland, and northeastern North America. It is common in the intertidal zone, including tide pools, and extends into shallow subtidal habitat down to around 50 m or more. It shows a strong preference for rocky or gravel substrates with abundant cover, and tolerates cold to cool temperate water temperatures. Some populations show slight seasonal movement between shallow inshore pools and slightly deeper adjacent water.

Bull Rout is a solitary, sedentary ambush predator that relies on camouflage to remain undetected among rocks and weed while waiting for prey to approach. It feeds mainly on small crustaceans, mollusks, and small fish, using a quick strike with its wide mouth to capture prey. It is well adapted to the harsh conditions of tide pools, tolerating temperature swings and periods of low water during tidal cycles. Spawning occurs in colder months, with females depositing egg masses on rocky substrate that are guarded until hatching. As a common intertidal predator, Bull Rout plays a role in controlling small invertebrate populations along rocky shores.