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. . MAY 1 THROUGH 5 - PHASES II AND I II CONTINUED Electrofishing was continued in the primary study area. A squawfish captured on May 3 was held for possible radio tagging (Table 1). On May 4, twelve radio transmitters were received, but no receivers. The transmitters were bullet shaped, with dimensions of 90 mm long and 20 mmin di ameter. They operated on the fo 11 owi ng frequencies: . 40.600, 40.602, 40.612, 40.621,40.631,40.640,40.652,40.662,40.670,40.682, and 40.691 Mhz. Two tags, differentiated by their rate of signal output, operated on the 40.612 Mhz fre- quency. Tags 40.600 and 40.602 also were differentiated by rate of output. A . . . MAY 6 THROUGH 10 - PHASES II AND II I CONTI NUED Simulated radio tags made of wood were implanted in a 2270 g (51b) walleye (Stizostedion vitreum) on May 6, and in a 1362 g (3 lb) walleye on May 7. They were released on May 10 in apparently good health. The 2270 g fish had been im~ planted using a mid-line incision and appeared to be he~ling well. The 1362 g fish had been implanted with a side incision and was not healing well. These fish were the last test fish used to establish the surgical technique to be used on squawfish. Since a receiver was due within a few days, radio tags 40.612 and 40.621 were implanted in two Colorado squawfish, each weighing 1362 g (31bs), on May 10. The fish were held in the live box for observation following the surgery. . t t MA Y 11 THROUGH 13 - PHASES II AND II I CONTI NUED t Electrofishing was carried out in the Ouray area during this period in an attempt to secure more squawfish suitable for implantation of radio tags. During this period, checks were made on the two radio tagged squawfish. t Both fish were in excellent condition and the sutures appeared to be healing well. 8 t