The correct answer is option 3, Dogfish. A dogfish is a type of fish that belongs to the shark family. It is a small species of shark, typically less than 3 feet long. Dogfish are found in oceans all over the world and are known for their strong swimming ability. They have a streamlined body, cartilaginous skeleton, and rows of sharp teeth. Dogfish are carnivorous and feed on smaller fish, squid, and crustaceans. They play an important role in ocean ecosystems as both predators and prey. Dogfish are commercially important and are sometimes used for food or their oil. They are different from the other options mentioned. Option 1, Silverfish, is actually an insect. Option 2, Starfish, is not a fish but an echinoderm. Option 4, Cuttlefish, is a marine animal related to squids and octopuses.