if, on the basis of scientific advice or evidence, it is necessary to avoid serious harm to a stock caused by intra- or inter-species stock dynamics; or
más rud é, ar bhonn comhairle eolaíche nó fianaise eolaíche, gur gá sin chun díobháil do stoc a sheachaint de bharr dinimic stoic laistigh den speiceas céanna nó idir-speiceas; nó