- Fishbase (http://www.fishbase.org/search.cfm) – Online encyclopedia summarizing scientific information about all species of fish from all parts of the world.
- Fishes of Wisconsin (http://www.seagrant.wisc.edu/greatlakesfish/becker.html) – Online version of the original (and classic) book “Fishes of Wisconsin” (1983) by George C. Becker.
- Minnesota fishes (http://www.gen.umn.edu/research/fish/fishes/natural_history.html) – Photos and information about Minnesota fishes, nearly all of which also occur in Wisconsin.
- Native Fish Conservancy (http://www.nativefish.org/) – Photos and information about the fishes of North America, many of which occur in Wisconsin.
- North American Native Fishes Association (http://www.nanfa.org/) – Photos and information about the fishes of North America, many of which occur in Wisconsin.
- University of Wisconsin Sea Grant (http://www.seagrant.wisc.edu/) – Information about the Great Lakes, with a large section about fishes.
- University of Wisconsin-Madison Center for Limnology (http://limnology.wisc.edu/) – Research on limnology, the study of inland waters, with descriptions of many research projects concerning Wisconsin fishes.
- Wiscfish (http://wiscfish.org/) – A photo-based, interactive system for identifying the fishes of Wisconsin, with a library of more than 4,000 images of all fish species in the state.
- Wisconsin Department of Natural Resources (http://www.dnr.state.wi.us/) – Information on management of Wisconsin’s natural environment, with many items about Wisconsin fishes and fisheries.
- Wisconsin fish distribution maps (http://infotrek.er.usgs.gov/fishmap) – Interactive system for generating detailed maps and tables of the distribution and abundance of all Wisconsin fishes.
- Wisconsin stream and river flows (http://waterdata.usgs.gov/wi/nwis/current?type=flow – Real-time flow conditions in Wisconsin streams and rivers.