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Aquatics – Fish Identification

Aquatics – Fish Identification. Fish Identification. Texas Envirothon 2015. Texas Edwards Plateau. Karst is a geomorphological structure resulting from the hydrochemical and water erosion of carbonate rock formations. San Marcos River. Comal River. Guadalupe River. Environmental Impacts.

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Aquatics – Fish Identification

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  1. Aquatics – Fish Identification Fish Identification Texas Envirothon 2015

  2. Texas Edwards Plateau

  3. Karst is a geomorphological structure resulting from the hydrochemical and water erosion of carbonate rock formations.

  4. San Marcos River

  5. Comal River

  6. Guadalupe River

  7. Environmental Impacts • Reduced springflows caused by increased pumping, irrigation, human consumption • Elimination of habitat – riparian loss, invasive plants • Degradation of water quality caused by urban expansion. • Increased pressure by recreational users

  8. Healthy Stream Characteristics Effects Meandering pattern Habitat diversity Intact riparian zone Natural deposition and erosion Species diversity Stream shading

  9. Degraded Stream Characteristics Effects Channelization Artificial substrate Lack riparian Scouring / Erosion Lower diversity Higher water temperature

  10. Common Fishes of Central Texas Photo Credits – Tim Bonner Lab – Texas State University

  11. Lepisosteus oculatus spotted gar

  12. Dorosoma petenense threadfin shad

  13. Cyprinella lutrensis red shiner

  14. Cyprinella venusta blacktail shiner

  15. Notropis chalybaeus ironcolor shiner

  16. Pimelphales vigilax bullhead minnow

  17. Ictiobus bubalus smallmouth buffalo

  18. Minytrema melanops spotted sucker

  19. Astyanax mexicanus Mexican tetra

  20. Astyanax mexicanus Mexican tetra

  21. Endangered Species of Edwards Aquifer Region

  22. Aquatic Species • In addition to stream biota, the Edwards Aquifer has over 40 species of highly adapted, aquatic, subterranean species • These include amphipod crustaceans, gastropod snails, and interesting vertebrates like blind catfish.  • Seven aquatic species are listed as endangered in the Edwards Aquifer system, and one is listed as threatened. 

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