Summary[edit] Description: English: The Olympic Mudminnow (Novumbra hubbsi). Washington's only endemic fish. You thought one male was a spectacular sight? Look at these three good looking fellows together! It's not just salmon who dress up to spawn. From Dempsey Creek, Olympia WA, Thurston County. Date: 26 August 2010, 23:05:21. Source: https://www.flickr.com/photos/usfwspacific/8145834103/in/photostream. Author: USFWS Pacific, Julie A. Tyson.