Gunnellus

Gunnellus is a genus of marine ray-finned fish belonging to the family Pholididae. These fish are commonly known as butterfish or rock gunnels. There are currently recognized species within the genus, including Gunnellus gunnellus, the rock gunnel, which is the most widespread and well-known. These fish are found in the cold waters of the North Atlantic Ocean, inhabiting rocky shorelines, tide pools, and kelp beds. They are typically small, elongated fish, with a continuous dorsal fin that runs the length of their body. Their coloration can vary, often providing camouflage against their benthic environment, with patterns of spots or blotches. Gunnellus species are primarily carnivorous, feeding on small invertebrates such as crustaceans and mollusks. They are an important part of the coastal ecosystem, serving as prey for larger fish and seabirds. Reproduction typically involves laying eggs in sheltered locations. The genus name, Gunnellus, is derived from the old Norse word for these fish.