I hear you, DeafGuy. When I first moved to Vancouver many years ago from the interior, I saw a guy with what appeared to be a 2 foot long shark in his catch bucket at Jericho Pier. "Holy frick there are sharks in the water" ran through my head. While technically correct - I'm sure I would have received some heckles for asking about it here - as local fishermen are very familiar with
Dogfish.
If you are wondering what it was, you can guarantee there are many more that do too.
I've been on a lot of local rivers, streams, creeks, and have only come across one. Cool little Signal Crayfish that came across the creek to check me out.