What animals live in the river Seine in Paris?

Answer:
Fish - 30 species including salmon up to 7kg - shellfish including mussels, various species of sponge, even recently an escaped pet alligator; but the only mammal is the ubiquitous rat.
First answer by Hedleygb. Last edit by Hedleygb. Contributor trust: 670 [recommend contributor recommended]. Question popularity: 23 [recommend question].