Title: Fisher Informal Behaviour Authors: Paul Rosele Chim, IES-GUYANE Université des Antilles et de la Guyane (France) Abstract: When we observe activities in french Guyana, we look some particular behaviours without references on modern or traditional economic sectors. It's informal behaviours creating disequilibrium. Fishering sector is a good example. We propose an examination as from two perspectives: in one side a productive logic, in the other side a trade logic. It's possible to reveal a conflict between the actors for appropriation of richness. We esperate to conclude on the finding and various methodologies.