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<br />. <br /> <br />signal. In over 6 feet of water, weak tags had very short ranges,and strong <br />. tags were reduced considerably. Thirdly, initial tests of the five implanted <br />transmitters indicated ranges of at least 100 yards on the surface. Following <br />approximately one month of operation in the river, the ranges of two transmitters <br />. had decreased to under 70 yards on the surface (Figure 3). <br />Fourth, transmitter 40.600 completely changed frequency so that the signal <br />was received only on 40.669 after one month of operation. <br />. Fifth, several transmitters drifted off frequency during operation so that <br />although they could still be received in their labeled frequencies, the strongest <br />signal was on a higher frequency. Tags 40.640, 40.670, and 40.682 were strongest <br />. on 40.641, 40.671, and 40.683, respectively. This probably was not a serious <br />problem because tag 40.670 (40.671) was implanted in a squawfish and followed for <br />6 weeks. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />20 <br /> <br />. <br />