Riding to work Monday morning I noticed that someone had left a wad of plastic bags filled with what appeared to be fish guts / fins / etc. on the side of the bike path - presumably to rot in the sun.
This morning, I could tell that the offensive material was still there, at least 200 yards (downwind) before I saw the pile. I called the city to have them send someone out to clean it up, but I'm not optimistic that it'll happen anytime soon.
(added, with many thanks to LilSprocket)