NO thats not how the joke goes.
There are 3 blondes fishing on a river. The game warden comes up to them and says "can I see whats on your lines Ladies?"
so they say yess and reel in and the warden notices that they have magnets attached to the lines. so then he says
"theres nothing illeagle about using magnets so ok thank you"
When he leaves the blondes start laughing and say
"Stupid game warden, Dosent he know that there are Steelhead Trout in the river"
hahahha