Participatory mapping and fishers’ knowledge about fish and shrimp migration in a subtropical coastal ecosystem

Abstract

Fishers’ ecological knowledge (FEK) has contributed to studies on the reproduction and migration of fish and marine invertebrates. With increasing accessibility to information technologies, several surveys have begun to use Geographic Information Systems (GIS) to access FEK through participatory mapping. Scientific knowledge on migration of fishery resources is fundamental to properly support initiatives for fisheries management. However, the technologies available to study migration are usually expensive and require several years of sampling. Our objective was to use GIS to access FEK and to identify the migration patterns of five fishery resources in a subtropical coastal ecosystem of the Southern Atlantic Ocean: the white catfish - Genidens barbus, the fat snook - Centropomus parallelus, the common snook - Centropomus undecimalis, the Atlantic spadefish - Chaetodipterus faber and the white shrimp - Litopenaeus schmitti. We interviewed 132 fishers in the Paranaguá estuarine complex and its adjacent coastal zone, Brazil. Of these fishers, 39 participated in the participatory mapping process. Our results based on FEK indicated that the migration of fishery resources is reproductive and occurs mainly in the later spring and summer when the species enter or exit the estuarine complex from coastal zone. The participatory mapping results indicated that G. barbus and C. faber migrate from the coastal zone to the estuary, while Centropomus species and the shrimp L. schmitti exit the estuary towards the coastal zone. The information generated by FEK and the methods used should be considered in future studies on ethno ecological research and to understand reproductive migration of these species. Furthermore, these observations could support fisheries management and environmental impact assessment of infrastructure projects.