Spain's accession to the European Union on 1 January 1986 meant the incorporation into its domestic law of the Union's acquis and, therefore, of the rules related to the Common Fisheries Policy. This was preceded by tough accession negotiations and the inclusion of a long transitional period with regard to fisheries that particularly affected the Galician fisheries sector, which has had to adapt to this legal environment and to its successive revisions in 1992, 2002 and 2012. Today, it must also adapt to Brexit. The present paper will be organised in two parts. The first part will examine the situation of the Galician fisheries sector in the context of current European fisheries law. The second part will address those aspects in which the legal impact is most obvious, paying special attention to the consequences that the United Kingdom's withdrawal from the European Union may have for them.