This dataset contains an inventory of the benthic fauna of the Gulf of Lion caught by bottom trawling. The objectives are not known. We assume that this is an exploratory seabed trawling survey to assess faunistic composition and the fishing possibilities in the region with this type of gear. We know that the inventory was probably carried out by Jean-Marie Pérès (who was at the time assistant professor at the Science faculty in Marseille) and for which a hand-written copy by Jacques Ancellin (director of the Boulogne-sur-Mer laboratory after the Second World War and he joined the OSTPM in 1942) was recovered. Only species presence was recorded.