This is the continuation of the STELARDETTA project, of the 2021 call of the Pleamar Program and focuses on the expansion of the study area for this new phase. In this way, it is intended to describe the feeding areas at sea of four species of breeding seabirds along the entire coastline of GSA06 from the tagging of specimens with GPS-GSM devices and to quantify their trophic requirements from the monitoring of the colonies. It will also assess feed availability based on estimates of prey stocks and an analysis of fishing activity in the study area and discard estimates by species. The ultimate objective is to analyze how the availability of food is related to the distribution and size of bird colonies, in such a way that it allows, on the one hand, to develop an indicator of the state of the stocks, exclusively based on population parameters of the birds. On the other hand, to design fisheries management measures that guarantee the good environmental status of species included in Annex 1 of the Birds Directive and also mandatory reporting in the Marine Strategy Framework Directive.