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DOUGLAS AND MARSH-ESTIMATES/MOVEMENTS OF GILA CYPHA 21 TABLE 3. ADULT Gila cYPha TAGGED IN 1992 WITHIN ONE REACH (= TAG REACH) OF THE LITTLE COLORADO RIVER DURING A GIVEN SEASON (= TAG SEASON), THEN RECAPTURED DURING THE SAME OR A SUBSEQUENT SEASON (= RCP.SEASON) WITHIN THE SAME OR A SUBSEQUENT REACH (= CONFLUENCE, POWELL, SALT). TAG REACH TAG SEASON RCP.SEASON CONFLUENCE POWELL SALT Total Confluence Winter Winter 23 (23.6%) 7 (07.3%) o (00.0%) 30 (30.9%) Spring 11 (11.5%) 18 (18.8%) 22 (22.9%) 51 (53.2%) Summer 7 (07.3%) 4 (04.2%) 2(02.1%) 13 (13.6%) Autumn o (00.0%) o (00.0%) 2 (02.1%) 2 (02.1%) Confluence Spring Spring 56 (29.6%) 41 (21.7%) 20 (10.6%) 117(61.9%) Summer 28 (14.8%) 14 (07.4%) 21 (11.1 %) 63 (33.3%) Autumn 4 (02.1%) 3 (01.6%) 0(00.0%) 7 (03.7%) Winter 1 (00.5%) o (00.0%) 1 (00.5%) 2 (01.0%) Confluence Summer Summer 50 (7D.4%) 5 (07.1%) 5 (07.1%) 60 (84.6%) Autumn 4 (05.6%) 4 (05.6%) 1 (01.4%) 9 (12.6%) Winter o (00.0%) 2 (02.8%) o (00.0%) 2 (02.8%) Confluence Autumn Autumn 7 (53.5%) 1 (07.7%) o (00.0%) 7 (61.2%) Winter 3 (23.1%) 1 (07.7%) 1 (07.7%) 5 (38.5%) Powell Winter Winter 2 (05.3%) 8(21.1%) 1 (02.6%) 11 (29.0%) Spring 2 (05.3%) 12 (31.6%) 6 (15.8%) 20 (52.7%) Summer 4 (10.5%) 2 (05.3%) o (00.0%) 6 (15.8%) Autumn o (00.0%) 1 (02.6%) o (00.0%) 1 (02.6%) Powell Spring Spring 4 (02.1%) 54 (28.0%) 37 (19.2%) 95 (49.3%) Summer 23 (11.9%) 37 (19.2%) 22 (11.4%) 82 (42.5%) Autumn 2 (01.0%) 6(03.1%) 4 (02.1%) 12 (06.2%) Winter 1 (00.5%) 2 (01.0%) 1 (00.5%) 4 (02.0%) Powell Summer Summer 8 (07.8%) 59 (57.3%) 6 (05.8%) 73 (70.9%) Autumn 5 (04.9%) 17 (16.5%) I (01.0%) 23 (22.4%) Winter 2 (01.9%) 4 (03.9%) 1 (01.0%) 7 (06.8%) Powell Autumn Autumn 1 (04.5%) 16 (72.7%) 1 (04.5%) 17 (77.2%) Winter o (00.0%) 4 (18.2%) 0(00.0%) 4 (18.2%) Salt Winter Winter o (00.0%) 1 (01.7%) 9 (15.0%) 10(16.7%) Spring 1 (01.7%) o (00.0%) 21 (35.0%) 22 (36.7%) Summer o (00.0%) o (00.0%) 21 (35.0%) 21 (35.0%) Autumn o (00.0%) 1 (01.7%) 6 (10.0%) 7(11.7%) Salt Spring Spring 2 (01.0%) I (00.5%) 64 (31.1 %) 67 (32.6%) Summer 11 (05.3%) 7 (03.4%) 81 (39.3%) 99 (48.0%) Autumn 3 (01.5%) o (00.0%) 19 (09.2%) 22 (10.7%) Winter 4 (01.9%) 5 (02.4%) 9 (04.4%) 18 (08.7%) Salt Summer Summer 3 (01.8%) 7(04.1%) 92 (53.8%) 102 (59.7%) Autumn o (00.0%) 0(00.0%) 54 (31.6%) 54 (31.6%) Winter 1 (00.6%) 1 (00.6%) 13 (07.6%) 15 (08.6%) Salt Autumn Autumn 1 (03.7%) o (00.0%) 16 (59.3%) 17 (63.0%) Winter I (03.7%) 1 (03.7%) 8 (29.6%) 10 (37.0%) chub tagged in summer were recaptured in that there summer through winter, whereas 93% (n same reach summer through winter. Similarly, = 159) tagged during summer were recaptured 77% (n = 10) of chub tagged at confluence in summer through winter. In autumn, 89% (n = autumn were retaken there autumn/winter. At 24) tagged at Salt were recaptured there au- Powell, 23% (n = 45) of individuals tagged in tumn/winter. Overall, 70% of recorded move- spring were again recaptured there summer ments in 1992 was static (i.e., within reach). through winter; 78% (n = 80) of those tagged Evidence is minimal for movement of G. cypha during summer were recaptured summer between reaches during collecting periods (Ta- through winter. In addition, 91 % (n = 20) of ble 4). In 1991, 13 out of 3272 fish were re- those tagged in autumn were recaptured in that captured during the same trip in a reach up- same reach autumn/winter. A similar situation stream from their initial capture, whereas 23 of occurred at Salt, where 53% (n = 109) of in- 3272 were recaptured downstream from their dividuals tagged during spring were recaptured initial capture reach (i.e., n = 36; 0.0 I % oftotal;