The fish collection includes thousands of lots of fish from at least 1200 collecting localities throughout southern Wisconsin. The first collections were deposited in 1904 by the Wisconsin Geological Natural History Survey. Between 1960 and 1978 over 1000 collections were made, helping to establish the fish database for southern Wisconsin, aiding in the research for a revised version of “Fishes of Wisconsin.” Marine fishes from the Western-Atlantic Eastward Cruises are tied to elaborate oceanographic data and collections of marine invertebrates. A large collection of marine fishes was received from the United States National Museum in order to support Wisconsin studies of fish diversity. The Department of Natural Resources deposits vouchers and collections from their current studies on lakes and streams throughout Wisconsin. Other smaller collections represent expeditions in Latin America.