Grammonus ater

Grammonus ater is a reef-associated fish found in the Eastern Atlantic, particularly in the Mediterranean from the Balearic Islands to the Adriatic. It is typically found at depths ranging from 5 to 30 meters, inhabiting shallow rocky areas. This species is known for being nocturnal, spending its days hiding in caves and becoming active at night. Divers may encounter this uncommon species during night dives, where it emerges from its daytime hiding spots. The maximum length recorded for Grammonus ater is 12 cm for males or unsexed individuals. The species is considered harmless to humans and is of no interest to fisheries. In terms of conservation, Grammonus ater is listed as Least Concern on the IUCN Red List. Divers interested in observing this fish should focus on exploring rocky reef areas, especially during night dives when the fish is more likely to be active.