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Figure 2 The HICI-FT as described in the text and in Appendix G. The section labeled top tank is an acrylic water-filled chamber in which the fish were placed prior to exposure. The HICI-FT is shown in the horizontal position used during sound exposure. fish received a pseudorandom presentation of pile strikes, and every day was different. HICI-FT Sound Control Operation Signal generation and data acquisition for the HICI-FT was controlled using a Dell laptop com- puter and a 12-bit analog/digital (A/D and D/A) converter (National Instruments Corporation, Model PCI-MI0 16E1). Analog drive signals were gener- ated on two separate channels of the A/D converter. These were filtered and attenuated using anti-aliasing filters and programmable attenuators (Tucker-Davis Technologies [TDT], Alachua, Florida, Model PA4). The attenuators provided the system with 100 dB of Figure 3 View inside the HICI-FT chamber (vertical dynamic range beyond the 12-bit resolution of the position). A Chinook salmon can be seen toward the A/D converter. The attenuators were controlled bottom of the tube. The long silver cylinder towards the through a serial interface with the PC. The outputs of bottom of the tube on the left is the light source and the attenuators were amplified by an amplifier (Crown digital camera. Just above this on the left is the hydro- phone (black, smaller tube). The wire in the center is for International, Elkhart, Indiana, Model XTi 4000), an accelerometer (white cylinder attached to the bottom one to each shaker (Vibration Test Systems, VG-150 of the tube). The large black device (lower right) Vibration Generator, Model VTS 150). measured temperature and total dissolved gas of the water All information regarding each experiment was in the tube after each experiment. The bottom of the tube recorded on data sheets. An example of the data is the faceplate for the piston coupled to the lower shaker. sheet is in Appendix C. 9