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Tracking of Giant Freshwater Stingray by Using Acoustic Telemetry in Maeklong River, Thailand

This presentation was given by Dr. Nitiwadee Keschumras at the October 2018 workshop "Needs, Techniques, and Risk Assessment: Toward a Vision for Management and Conservation of Migratory Fish Species in Cambodia." It shows a research effort to study the movements of giant freshwater stingrays (Himantura chaophraya/Urogymnus polylepsis) using acoustic telemetry technology.

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Tracking of Giant Freshwater Stingray by Using Acoustic Telemetry in Maeklong River, Thailand

  1. 1. Tracking of Giant Freshwater Stingray (Himantura chaophraya/ Urogymnus polylepsis) by Using Acoustic Telemetry in Maeklong River, Thailand Nitiwadee Keschumras , DVM Veterinary Medical Aquatic animal Research Center, Chulalongkorn university
  2. 2. The Giant Freshwater Stingray “RAHU” Stingray
  3. 3. ü A size can be up to 240 cm disc width (DW) and 600 kg in weight. ü Males mature by 110 cm DW. ü Young (a single pup) are born at about 30 cm DW.
  4. 4. Geographic range ü Found in Chaophraya, Nan, Maeklong, Bang pakong, Tachin, Mekong rivers. ü The species does appear to occur in both brackish and freshwater of Himantura chaopraya
  5. 5. Endangered status in 2000
  6. 6. Endangered status in 2018
  7. 7. Threats ü Bycatch or invasive techniques fishing ü Capture for aquariums and sport fishing ü For food (urban area)
  8. 8. Mass deaths ü Degradation of riverine environments and pollutions
  9. 9. Life history by tagging …… ü V9-180 KHZ transmitter ü VR2W-180 KHZ receivers Study life history, life cycle and habitats
  10. 10. Identification ü RFID TAG Pocket Reader ü Passive Integrated Transponder tags (PIT tags) / microchip
  11. 11. 1 2 3 4 5 6 7 8
  12. 12. ü 10 Males ü 10 Females
  13. 13. Monitoring Techniques and Technology ü Acoustic telemetry - Movement pattern - Seasonal migration - Habitat use ü Reduce the frequency of capturing ü Management plans and design protected areas