Laserfiche WebLink
27 <br />Data logging stations <br />A data logging station was setup on the large island south of the spawning area. <br />The station consisted of three, four-filament Yagi antennas. One antenna faced upstream, <br />the second faced downstream, and the third pointed directly at the spawning bar. The <br />antennas were connected to a Lotek model SRX 400 logging receiver. The receiver was <br />powered by a photovoltaic panel equipped with a battery. The stationary logger operated <br />between May 1 and June 6, 2000. <br />The station continually scanned for the nine razorback sucker frequency-code <br />combinations. When a fish was within range the transmitter frequency, code, time, and <br />signal strength were recorded. From these data it was determined when each razorback <br />sucker approached and departed the spawning area (i.e. time; date; and time period of <br />activity - nocturnal, diurnal, and crepuscular) and how long each fish remained in the <br />spawning area. <br />Ground Survey Telemetry <br />The spawning bar was monitored for a 24-h period to determine specific locations <br />of transmitter attached fish on four dates; May 16-17, May 18-19, May 23-24 and May <br />24-25. Locations of fish were recorded hourly over each 24-h period. Specific fish <br />locations were obtained by triangulation. The shoreline was walked with a hand held <br />three-element Yagi antenna until a signal was detected. Then bearings were taken using <br />a compass to locate each fish. The locality was triangulated from two of the five known