Any south island guys who are thinking of catching some out of "the quarry" in shawnigan, don't do it. I was talking to a guy in there a few years ago who was doing a research project on them. He said that since it's a closed ecosystem (no outflow), they are FULL of nasty shit. It was also enough to convince me not to swim in there anymore. Everything that hits the surface of the water and sinks, eventually goes through those bottom feeders.
Yuk.