Medical EMT Show
from the late 1990s.
I thought it was 'Third Watch', I just watched the series again [realizing later on that I've watched the entire series before -- this happens to me a lot lol] and it wasn't this show.
From what I remember, the scene is an episode opener. EMTs are called into a bar, I believe, and a young man is choking. The EMTs realize the dude swallowed a fish, which is stuck in his throat. I don't know if they end up traqing him or not.
Damn, though, I thought it was 'Third Watch'.
Any ideas?