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I I I I I I I I I I I I I I I I I I I Table 2. Data for Colorado squawfish implanted with radio transmitters~ Colorado River~ fall 1982 and spring 1983. SUBSEQUENT TOTAL RELEASE RELEASE CONTACTS MAX Il'rt.M FISH LENGTH WEIGHT SITE DATE NLMBER DURATION DISPLACEMENT NO. (nm) (g) (RM) (month/day) (DAYS) (MILES)e 23 660 2~660 34a 9/10 4 410c -4 24 565 1,400 144 10/14 3 201c 3 25 578 1,700 136 10/14 4 201c 10 26 502 1,000 136 10/14 9 298c 48 27 604 1,810 136 10/14 2 100c 28 553 1,240 144 10/14 9 291c 21 29 688 2,800 136 10/14 6 277c 27 30 555 1,180 89 10/27 1 13c 1 31 541 1,070 89 11/08 1 247c -3 32 550 1,120 89 11/08 0 Oc 33 440 520 71 11/10 6 30Sc -17 34 738 3,520 136 4/6 12 240d 15 35 593 1,625 136 4/7 5 131c 18 36 600 1,690 136b 4/7 13 196c 14 37 589 1,469 197b 4/14 6 140c 9 38 572 1,380 199b 4/16 11 137d 11 39 530 1,000 197b 5/2 2 122c 6 40 546 1~000 197 5/5 0 Oc 41 531 950 66 5/5 8 162c -30 42 520 1 ,500 197b 5/7 5 145c 4 43 572 1,420 197b 5/13 3 nod 3 a Gunnison River, measured upstream from its confluence with the Colorado b River. Upper Lake Powell, measured upstream from Lee Ferry, Arizona. c d Radio transmitter with a theoretical 540-day battery life Radio transmitter with a theoretical 30o-day battery life. e Negative values indicate movement downstream from the release site. downstream to the Black Rocks area in mid summer, whereas others (Nos. 8 and 9) moved to the Black Rocks area with no prior upstream movement. For a short time prior to the estimated spawning period in 1982, three radio-tagged fish (Nos. 11, 18 and 19) occurred in a river pool near Clifton, Colorado. Six fish had moved to Black Rocks by the end of the monitoring period. The remaining radio-tagged fish in this reach exhibited a variety of up- and downstream movements~ but stayed in the Grand Valley area. In 1983, two Colorado squawfish (Nos. 26 and 28) that had been implanted with long-term radio transmitters in the Black Rocks area during fall 1982 had moved upstream to the Grand Junction area by May. One of these (No. 26) subsequently moved farther upstream to the Palisade area in August. In 1984, 12