After some extreme research (re-watching Finding Nemo) I conclude that yes. Yes they will.
At my house it will end up in the septic tank...
How big is the fish?
Maybe it could wear a gas mask.
Hopefully. It depends if it will be able to survive through all the waste in the sewers, and if it can find it's way to the ocean. Most sewers lead to a cleaning facility, so yeah. :/
no it will die, in ****.