The spiny dogfish is a small species of shark found in temperate waters around the world, particularly in the North Atlantic Ocean. It typically grows to about 2 to 4 feet in length and is known for its slender body and sharp spines located in front of its dorsal fins. This shark is often grayish-brown in color with a white underside, which helps it blend into its surroundings. Spiny dogfish are opportunistic feeders, primarily consuming small fish, squid, and crustaceans. They are known for their schooling behavior, often found in large groups. Due to their abundance, they are commonly caught for commercial purposes, including fish and chips and other seafood dishes.