I think that was a really great answer.
We do the tagging studies, and we have sonar to measure the fish as they pass through the site.
We look at the spawning grounds as well to see how many fish have made it to the spawning grounds. Similarly, in the spring, we look to see how many of the fry have emerged and how many smolts have come down. We do that to some extent as well.
We have a number of different methods to test and evaluate the number of fish in the area that are coming into the Fraser and leaving as well.