This study analyses the social logics of the non-adoption by Fantis fishermen in the Azuretti maritime area of modern practices through the regulation of fishing activity. Starting from a methodological approach based on documentary analysis and data collection from field surveys (observation and interviews) carried out among a category of actors in the Azuretti maritime space, the following results were obtained: Fantis fishermen bypass the new innovative rules considered too restrictive by mobilising factors of subsistence and control of the fishing activity. Also, it should be noted that the occupation of this area for a long time by the Fantis (from Ghana) legitimizes their appropriation behaviour to the detriment of the indigenous Ivorian populations. Perceived as a form of piracy, the persistence of this illegal activity is justified by a lack of control measures on the part of modern and customary administration actors.