Abstract
Summary Objective: 1. A descriptive analysis of total catch in terms of species and size composition 2. The development of indicators of discard issues 3. An analysis of the factors that determine discard amounts 4. Economical and sociological investigations of fishers’ behaviour to understand how discarding is part of their fishing strategy 5. Based on all previous steps, the elaboration of potential mitigation measures. Key Customer Purpose: In the EU there is intensive data collection of bycatch and discard onboard commercial vessels but until now there have been few attempts to describe the general patterns in these data, and still less to understand the factors that determine what and how much is discarded. This is key if we are to develop operational indicators and propose mitigation tools for fisheries management.