We monitor for fish in two ways, above water and below. We use hydro-acoustic monitoring and sonar technology to count the number of salmon successfully passing through the slide. We also use radio tagging, which involves inserting a tag into the fish's stomach and attaching it to its back. The radio tag emits a signal, and it's detected onshore. That can give us a better idea of how many fish are going through.
I am going to turn that one over to the deputy as well, because it's quite technical.