To inform participants to the 18th Working Party on Data Collection and Statistics (WPDCS18) on a proposal to rationalize the definition and structure of the fishery concept, with a view to improve the reporting of statistical data to the IOTC as well as their dissemination. This proposal defines a fishery as a combination of several factors (mandatory and optional), which determine the nature and unique codification of the fishery itself and guarantee its identity across the Indian Ocean region, eliminating potential ambiguities to the maximum extent possible.