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 nó fianaise eolaíoch, gur gá sin chun díobháil thromchúiseach a sheachaint a dhéanfadh dinimic stoic ion-speiceas nó idir-speiceas don stoc; nó