• Biological Solutions
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Fish Monitoring and Counting Systems
Wild Fish Monitoring
Environmental Assessments
Marine Research
Ecological Restoration
Fish Telemetry
Fish Surgery
Species at Risk
Fisheries Studies
Research Photos
News and Media
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Fish Passage, Dam Impacts, Fishway Evaluations

We have been continuously monitoring fish passage and the effects of dams and weirs on fish and other wildlife since 1994. We use remote monitoring techniques such as radio telemetry, acoustic telemetry, physiological telemetry as well as overhead and advanced underwater videography to unobtrusively observe animals. We also use active and passive capture techniques to collect, inventory and enumerate study organisms while characterizing and describing used and available habitat under various environmental conditions. Experienced teams of technicians collect and analyze data, and a proven team of scientists prepare reports and scientific papers. By understanding effects of barriers to fish migration, and the effects of different types of habitats that exist upstream and downstream from river barriers, we can suggest strategies that selectively increase permeability, and imperceptibility of migration barriers for fish.

  Longhorn Dam
Longhorn Dam, Austin Texas - Blue sucker spawning area (above)
Decker Dam, Lower Colorado River, Texas (below)


Pool-and-weir fishway built in 1973 in Brazil near Venāncio Aires, Brazil

Spillway and floodgates injuring and killing fish with extreme shear forces in Brazil

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