Commission Implementing Regulation (EU) 2017/788 of 8 May 2017 amending Implementing Regulation (EU) No 1243/2014 laying down rules pursuant to Regulation (EU) No 508/2014 of the European Parliament and of the Council on the European Maritime and Fisheries Fund with regard to the information to be sent by Member States, as well as on data needs and synergies between potential data sources