The Tesselated Blenny (Hypsoblennius invemar is a small (to 58 mm) demersal fish associated with oil platforms, rock outcrops, and buoys. It has a large head, with large eyes, several feathery cirri, and a tapered body with long dorsal and anal fins. Tesselated Blennies, are colorful, with a blue body and red spots. Blennies typically are associated with holes and crevices, which males defend as territories. Spawning takes place in an empty barnacles shell or other confined spaces, and the eggs are guarded by the male. Blennies feed mostly on small invertebrates. Hypsoblennius invemar was described from specimens found in barnacles on docks in Santa Marta Bay, Colombia, in 1976 and on an oil rig off Louisiana in 1979 (Smith-Vaniz 1980). It was first reported from Gulf of Mexico waters around oil platforms off Louisiana and Texas in 1978-1979. In these, and many other sites, it is found in the shells of the large barnacle Megabalanus antillarum). Because of its strong association with artificial structures, and its disjunct distribution in the southern Caribbean (Venezuela-Panama) and Gulf of Mexico (Florida-Texas), the Tesselated Blenny is believed to have been introduced to the northern Gulf of Mexico, probably in fouling of oil rigs, or the fouling and ballast water of ships involved in the oil industry.