I can add a little bit.
There's a great deal that you can do to measure and monitor things inside protected areas without killing them—you do it by scuba diving, you do it by remote video, for example. This is a great way to bring in the university academic sector to assist with research, to look at the management, and to examine how well the management is working. We've been doing it in the Firth of Clyde on the west coast of Scotland since the protected area there was implemented, and we have some excellent data.
You don't have to kill fish to be able to measure their population sizes or to look, for example, at where they're moving.