The Genus Blennius refers to a group of fish species that belong to the family Blenniidae. These fish are commonly known as "blennies," which is a synonym for the Genus Blennius. Other synonyms for this group of fish include "rockfish," "kelpfish," "clingfish," and "barnacle blenny." While the physical appearance of these fish may vary depending on the species, they all share certain characteristics, such as elongated bodies, small scales, and a single long dorsal fin. Blennies are found in marine environments around the world, including shallow rocky and coral reefs, tide pools, and intertidal zones. These fish play an important role in the ecosystem as both predators and prey.