Generally speaking, within fisheries science, if we're providing advice on an allowable catch or trying to evaluate the status or trends within a population, we do need a time series of catches. Usually we would like to have something that's independent of the fishery, but we do use fishery information as well.
It's usually something that gives us an idea of change in abundance. I'm not going to get into survey design, but you understand what I mean. Certainly there is catch from the fishery, but there are other sorts of environmental indicators that we would collect that we could use to try to evaluate productivity.
These actually help us—