The irreversible character of the management of a renewable resource, in this case halieutic, makes the intervention of public authorities urgent. In addition, this intervention must be directed by an economic analysis. In our case, an appeal for the economic analysis of fishing via bio-economic modelling becomes a necessity. On the other hand, the lack of data conjugated into unreliable statistics, the marginal interest given to the research in this field and the absence of multi-disciplinary approaches, make the approach increasingly difficult in developing countries. In this context, the purpose of this paper is to put into evidence the possibility of offsetting the different conceptual and methodological constraints in return for empirical approaches based on investigations. The forward setting of the contribution of such approaches to help taking decisions, by the conception of lasting development models while endowing managers of the fishing sector with relevant information, is also one of the objectives of this paper.