I've not done the mathematics, but I've followed them. I can follow them. I have a degree in physics. And I know that they're correct, for what it is. I know that his sampling, because I visited the Broughton Archipelago, was also good.
What I can tell you from my own experience is that we have loaded chinook salmon, approximately 30 grams in weight, with about ten sea lice, for the purpose of testing a live trap. We wanted to see whether the live trap would delouse the salmon. What I can tell you is that within about two hours, healthy chinook salmon, about 30 grams with a load of ten sea lice, looked moribund. They were not swimming very well in the tank. Obviously we carried controls in which we manipulated salmon in the same way, but without loading the sea lice, so it can only be the sea lice that are inducing this.