This Oaxaca Cave Sleeper is one of thirteen specimens collected from a cave beneath a reservoir on Mexico's Tonto River. It lacks eyes, is unpigmented, and has sensory adaptations characteristic of fish that live in total darkness. Thuis is the holotype, the example used to describe and name this newly identified species. Credit: Howard L.
Stephen Walsh, Ph.D.
Stephen Walsh is a retired Research Fish Biologist with USGS-WARC in Gainesville, Florida.
Stephen's 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. Additionally, he has conducted research in the Neotropics, Africa, and Micronesia. His 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.
Education
Ph.D., University of Florida
M.A., Southern Illinois University
B.A., Saint Louis University
Professional Experience
1991-2021, U.S. Fish & Wildlife Service, U.S. Geological Survey
1986-1990, Florida Museum of Natural History
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 13 graduate student committees (University of Florida; University of Southern Mississippi; Southern Illinois University, Valdosta State University).
Science and Products
Evaluating establishment success of non-native fishes introduced to inland aquatic habitats of tropical Pacific islands
Submerged aquatic vegetation habitat use of age-0 Florida bass Micropterus floridanus
Biological and practical tradeoffs in planting techniques for submerged aquatic vegetation
Beloniformes: Belonidae (Needlefishes) and Hemiramphidae (Halfbeaks)
Book review: Proceedings of the First International Snakehead Symposium
Effects of box culverts on stream habitat, channel morphology, and fish and macroinvertebrate communities at selected sites in South Carolina, 2016–18
Indo-West Pacific species of Trachinotus with spots on their sides as adults, with description of a new species endemic to the Marquesas Islands (Teleostei: Carangidae)
Stream fish colonization but not persistence varies regionally across a large North American river basin
Revision of the jawfish genus Lonchopisthus with description of a new Atlantic species (Teleostei: Opistognathidae)
Taxonomic revision of the South American catfish genus Ageneiosus (Siluriformes: Auchenipteridae) with the description of four new species
A new genus and species of blind sleeper (Teleostei: Eleotridae) from Oaxaca, Mexico: First obligate cave gobiiform in the Western Hemisphere
Revision of Tympanopleura Eigenmann (Siluriformes: Auchenipteridae) with description of two new species
Submerged Aquatic Vegetation Preferences of Fishes in Lake Apopka, Florida
Risk Analysis of Invasive Freshwater Fishes in Hawaii and Micronesia
WaterSMART: Apalachicola/Chattahoochee/ Flint River (ACF) Basin
Mekong River Fish Ecology: Information Gap Assessment and Capacity Building in Southeast Asia
Developing a Largemouth Bass Hybrid Strain for Mapping Genome Linkage
WaterSMART: Improving Tools for Assessing and Forecasting Ecological Responses to Hydrologic Alteration
Integrative Studies of Florida Spring Ecosystems
Variables pertaining to establishment success of non-native fishes introduced to the Hawaiian Islands and Guam for use in risk analysis modeling
Stream habitat and geomorphic characteristics above and below culverts at selected sites in South Carolina (2017)
Indo-West Pacific species of Trachinotus with spots on their sides as adults, with description of a new species endemic to the Marquesas Islands (Teleostei: Carangidae)
Meristic and morphometric data for "Revision of the jawfish genus Lonchopisthus with description of a new Atlantic species (Teleostei: Opistognathidae)"
This Oaxaca Cave Sleeper is one of thirteen specimens collected from a cave beneath a reservoir on Mexico's Tonto River. It lacks eyes, is unpigmented, and has sensory adaptations characteristic of fish that live in total darkness. Thuis is the holotype, the example used to describe and name this newly identified species. Credit: Howard L.
Science and Products
Evaluating establishment success of non-native fishes introduced to inland aquatic habitats of tropical Pacific islands
Submerged aquatic vegetation habitat use of age-0 Florida bass Micropterus floridanus
Biological and practical tradeoffs in planting techniques for submerged aquatic vegetation
Beloniformes: Belonidae (Needlefishes) and Hemiramphidae (Halfbeaks)
Book review: Proceedings of the First International Snakehead Symposium
Effects of box culverts on stream habitat, channel morphology, and fish and macroinvertebrate communities at selected sites in South Carolina, 2016–18
Indo-West Pacific species of Trachinotus with spots on their sides as adults, with description of a new species endemic to the Marquesas Islands (Teleostei: Carangidae)
Stream fish colonization but not persistence varies regionally across a large North American river basin
Revision of the jawfish genus Lonchopisthus with description of a new Atlantic species (Teleostei: Opistognathidae)
Taxonomic revision of the South American catfish genus Ageneiosus (Siluriformes: Auchenipteridae) with the description of four new species
A new genus and species of blind sleeper (Teleostei: Eleotridae) from Oaxaca, Mexico: First obligate cave gobiiform in the Western Hemisphere
Revision of Tympanopleura Eigenmann (Siluriformes: Auchenipteridae) with description of two new species
Submerged Aquatic Vegetation Preferences of Fishes in Lake Apopka, Florida
Risk Analysis of Invasive Freshwater Fishes in Hawaii and Micronesia
WaterSMART: Apalachicola/Chattahoochee/ Flint River (ACF) Basin
Mekong River Fish Ecology: Information Gap Assessment and Capacity Building in Southeast Asia
Developing a Largemouth Bass Hybrid Strain for Mapping Genome Linkage
WaterSMART: Improving Tools for Assessing and Forecasting Ecological Responses to Hydrologic Alteration
Integrative Studies of Florida Spring Ecosystems
Variables pertaining to establishment success of non-native fishes introduced to the Hawaiian Islands and Guam for use in risk analysis modeling
Stream habitat and geomorphic characteristics above and below culverts at selected sites in South Carolina (2017)
Indo-West Pacific species of Trachinotus with spots on their sides as adults, with description of a new species endemic to the Marquesas Islands (Teleostei: Carangidae)
Meristic and morphometric data for "Revision of the jawfish genus Lonchopisthus with description of a new Atlantic species (Teleostei: Opistognathidae)"
This Oaxaca Cave Sleeper is one of thirteen specimens collected from a cave beneath a reservoir on Mexico's Tonto River. It lacks eyes, is unpigmented, and has sensory adaptations characteristic of fish that live in total darkness. Thuis is the holotype, the example used to describe and name this newly identified species. Credit: Howard L.
This Oaxaca Cave Sleeper is one of thirteen specimens collected from a cave beneath a reservoir on Mexico's Tonto River. It lacks eyes, is unpigmented, and has sensory adaptations characteristic of fish that live in total darkness. Thuis is the holotype, the example used to describe and name this newly identified species. Credit: Howard L.