The long-time fishery tradition on the Mediterranean coastal region without a biological-base management strategy has led to an overexploitation of the main fishing resources. To overturn this trend, the European Union implemented the Western Mediterranean Multi-Annual Plan (WMMAP) aiming to better manage key commercial species caught by bottom trawling. The data to drive management decisions should be obtained from fisheries monitoring programs designed to collect data that reflect dynamics of both biological and spatio-temporal trends in different spatial extents and scales. With this in mind, the aim of this research is to analyze the spatio-temporal variability of the commercial fraction of the catch, focusing on the main fishing resources of the Catalan bottom trawling fleet throughout the GSA 6.