if, on the basis of scientific advice or evidence, it is necessary for the achievement of the objectives laid down in Article 3 in the case of mixed fisheries;
más rud é, ar bhonn comhairle eolaíche nó fianaise eolaíche, gur gá sin chun na cuspóirí a leagtar síos in Airteagal 3 in iascach measctha a bhaint amach;