This article discusses the use of plant biodiversity in two important activities that mark the ways of life of traditional populations. We sought to understand the ethnobiological knowledge in traditional communities used in the manufacture of fishing and extractive equipment. Hold discussions on fishing activities and plant extraction; and the variety of equipment are the specific objectives that guide this research. To collect the data, semi-structured interviews, field notebooks and open questionnaires were used for families living in four communities in the island region of the municipality of Cametá. Eight (08) devices made from ten (10) plant species were identified. The matapí was the equipment most mentioned by informants. Specific species are identified in (04) botanical families, with Arecaceae being the most cited family. The informants presented important ethnobiological knowledge about the species, as well as the ethnodefinition of each individual and their respective use in the community.