Abstract
Cryptobenthic fishes are bottom dwelling species that are easily overlooked because of their small size, their colouring similar to the surrounding, or because they live hidden. These species are also often difficult to identify. For these reasons, the diversity of cryptobenthic fishes is one of the least known of the marine world. This Notebook presents the observations of cryptobenthic fishes made in the Bay of Agay, in the French Mediterranean, by a group of naturalist divers, in particular during two missions targeting these species in 2021. Notably, we describe the first records for France of two species of gobies (Buenia massutii and Speleogobius llorisi), the first mention of Gobius gasteveni and the second of Lebetus guilleti for the French Mediterranean. These missions demonstrate that the marine cryptobenthic ichthyofauna of our territory is still understudied, including in the coastal zone accessible to recreational diving.