1. Principles of Hydroacoustics 102 By BioSonics, Inc.

2. Digital scientific echosounder, transducer, and notebook computer

4. Lake Washington Watershed: USGS Area of Interest

7. Data Collection 250 hectares (600 acres), surveyed. Transects spaced at 50m intervals. Collected acoustic data using 70kHz and 420kHz transducers 2 ½ days for two technicians @ 2-3 m/s

9. Transects from the north and the center of the sampling area

10. Submersed Aquatic Vegetation

11. Fixed-Location Applications

14. Case Study Riverine Fish Counting Studies

16. Transducer Mounted on Electronic Rotator

17. Field Mount

18. Field Helpers

19. Echogram Showing Fish Distribution

20. Real-Time Fish Counting Software

21. Acoustic versus Visual Counts

22. Low Density Comparison

23. High Density Using Echo Integration

24. Case Study Enhancing Acoustic System Versatility with Wireless Technologies

26. North Fork Dam

28. Transducer Mount

29. Mount Attachment

30. Orientation of Acoustic Sample Volume

31. Direction of Fish Travel

32. Direction of Travel Summary

33. Assignment of Risk

34. Fish Passage Data

36. Outside Access is Distant

37. Wireless Remote Control

38. Case Study Fish Passage at a Hydroelectric Dam

39. Lower Granite Dam, U.S. Army Corps of Engineers

41. Downstream Environment Hostile to scientific acoustic techniques

42. Forebay Environment Acoustically quiet environment under normal conditions

43. Exceptions

44. More Exceptions

45. Robust Transducer Mounts

46. Many Transducers Installed by Divers

47. Transducer Mounting Locations

48. Orientation of Beam at Turbine Intake

49. Passage Data

50. Case Study Biological Triggering

55. Case Study Tidal Energy Project