Passive integrated transponger tags are used to monitor individual fish. The tag, 12 mm long, is inserted in the fish's body cavity and contains a microchip programmed with individual fish ID codes. The system yields information about passage times of individuals at pittag observation sites.
Release cohorts were formed by combining releases from up to 5 consecutive days to achieve observed sample sizes of at least 30 individuals. 37 cohorts were constructed from 102 releases over 5 years.
| 1995 | ||
|---|---|---|
| 120.2 | 10.0 (45) | 13.5 (3) |
| 124.2 | 11.1 (56) | 13.6 (8) |
| 128.3 | 10.9 (51) | 10.9 (3) |
| 131.5 | 15.3 (53) | 10.9 (5) |
| 137.3 | 8.5 (52) | 14.1 (3) |
| 144.4 | 8.9 (48) | 12.6 (1) |
| 1996 | ||
| 120.5 | 7.7 (56) | 9.6 (11) |
| 123.9 | 6.7 (69) | 10.4 (14) |
| 128.1 | 7.3 (42) | 9.3 (12) |
| 130.1 | 6.3 (50) | 8.6 (8) |
| 133.6 | 7.7 (43) | 8.3 (7) |
| 137.2 | 6.2 (46) | 7.3 (11) |
| 139.2 | 4.9 (49) | 8.2 (1) |
| 143.2 | 5.3 (48) | 6.9 (6) |
| 149.6 | 5.2 (30) | 7.0 (3) |