Well, when I started, I said there were four main questions at the heart of this issue. First, do lice spread from farmed salmon to wild salmon? Second, what is the effect of sea lice on individual juvenile salmon, on their survival and behaviour?
Third, what is the effect on wild salmon populations of the infestations that happen recurrently, year after year? It's a big step to go from effects on an individual fish to the productivity of the population. Then, finally, there is the fourth question: if we believe that we have a problem, what are the management solutions to this problem?