The common sole is distributed from Eastern Atlantic to Senegal, including the Mediterranean Sea (FAO 2018). Several studies on the stock structure have been conducted on the NE Atlantic region and in the Mediterranean (e.g. (Rolland et al. 2007)(Cuveliers et al. 2012)), lacking the inclusion of the African region. Therefore, and in lack of an assessment known to be conducted, a management unit is considered within Moroccan waters. Various Solea species can be caught but this species is the most common one (FAO 2018).