I am very thankful that I found this thread! About a month ago we started smelling a foul odor that resembled rotting fish. We have been baffled as it progressively got worse to the point we could not take the smell anymore. I googled clothes dryer fish smell and this thread popped up! I went straight to the electrical plug and that is the problem. Discolored blades, some type of polymer or something melting that is putting off the fish smell. Possibly prevented my house from burning down! Thanks to all that posted on this thread!

Same here! The outlet was the culprit, and it looks like one of the connections didn't have enough of the Noalox goop compared to the others. At least, the one with scorch marks appeared dry when I removed it, and the others with remaining Noalox were fine. It was probably the original outlet in this 35 year old house with 3 conductor aluminum wiring to the dryer (rest of the house is copper).

Quick tip: be sure to use Noalox if your wiring is aluminum! I didn't know about that until this issue.