Stephen Walsh, Ph.D.



Ph.D., Zoology, University of Florida, 1990  

M.A., Zoology, Southern Illinois University at Carbondale, 1982

B.A., Biology, Saint Louis University, 1979 


Stephen Walsh is a Research Fish Biologist with the U.S. Geological Survey, Wetland and Aquatic Research Center in Gainesville, Florida. His primary expertise is in the general fields of ichthyology and fish biology, with secondary expertise in aquatic ecology and ecophysiology. Most of his research has been focused in lotic and estuarine systems throughout the Southeast, including wadeable streams, large rivers, and springs. Additionally, he has conducted research that has taken him to remote areas of the Neotropics, Africa, and Micronesia. Walsh's research interests include conservation biology and biodiversity of aquatic organisms; ecology and environmental physiology of fishes and aquatic invertebrates; evolution, systematics, and zoogeography of temperate and tropical freshwater, estuarine, and inshore marine fishes; reproductive biology and physiology of lower vertebrates; life-history strategies.


Professional Experience

1996 - present  Research Fish Biologist, U.S. Geological Survey

1993 - 1996     Research Fish Biologist, National Biological Survey

1990 - 1993     Research Fish Biologist, U.S. Fish and Wildlife Service

1986 - 1990     Biological Scientist, Florida Museum of Natural History

Professional Memberships

American Fisheries Society (Endangered Species Committee, 2003-present); American Institute of Biological Sciences; American Society of Ichthyologists & Herpetologists (Ichthyological Information Coordinator, 1992-1998; Storer Judge 1993, 1996, 2007; Chair, Raney Award Committee 1994-1995; Conservation Committee, 1997-present); Association of Southeastern Biologists; Biological Society of Washington; Florida Academy of Sciences; Neotropical Ichthyological Association; Sociedade Brasileira de Ictiologia; Sigma Xi; Southeastern Fishes Council (Chair, 1995-1997; Technical Advisory Committee, 1997-2005).  Other activities: Robust Redhorse Conservation Committee (1992-1999); Judge, Eugene P. Odum award, Southeastern Division of Ecological Society of America (1997); Judge, best student paper, Southeastern Division of American Society of Ichthyologists & Herpetologists (2007).

Awards and Honors

Dean’s List, St. Louis University (1975-1979); Beta Beta Beta National Honor Society (1978); Graduate Dean’s fellowship, Southern Illinois University (1979-1980); Sigma Xi, associate membership (1981); Richard E. Blackwelder Award in Zoology, Southern Illinois University (1982); Raney Award, American Society of Ichthyologists & Herpetologists (1985); Graduate Dean’s Dissertation Fellowship, University of Florida (1985); Sigma Xi, full membership (1990); Special Achievement Award, National Biological Service (1994); Quality Performance Award, National Biological Service (1994); Outstanding Recognition, U.S. Fish & Wildlife Service Region 4 (2000); Star Awards, U.S. Geological Survey (various years).

Contracts and Grants

Served as Principal Investigator, Co-Principal Investigator, and biologist on numerous grants from federal and state agencies (U.S. Navy, USGS National Water-Quality Assessment Program, U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency, National Science Foundation, Florida Fish and Wildlife Conservation Commission; Florida Department of Environmental Protection, St. Johns Water Management District; Florida Sea Grant, National Marine Fisheries Service, National Oceanic and Atmospheric Administration; National Underwater Research Program).

Academic Affiliations

School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, University of Florida (Courtesy Assistant Professor, 2005-present); Florida Museum of Natural History (Courtesy Associate Curator in Ichthyology, 1992-present); Department of Biology, University of Florida (Courtesy Assistant Professor, 1996-present).  Served on 12 graduate student committees (University of Florida; University of Southern Mississippi; Southern Illinois University, Valdosta State University).