WSP12063

• File Number: 8240.300.31.J
• Description: San Juan River - Environmental Studies
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 2/1/2000
• Title: Non-Native Species Interactions: Management Implications to Aid in Recovery of the Colorado Pikeminnow and Razorback Sucker in the San Juan River
• Water Supply Pro - Doc Type: Report/Study

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Table 3.

Number of Floy tagged channel catfish (ICTPUN) and common carp
(CYPCAR) captured and recaptured in the San Juan River by year,
1992-1997.

Tagged Recaptured % Recaptured
ICTPUN CYPCAR ICTPUN CYPCAR ICTPUN CYPCAR
1992 1,677 694 32 II 1.9 1.6
1993 752 1,001 53 79 2.2 4,7
1994 341 287 42 64 1.5 3,2
1995 624 667 37 86 l.I 3,2
1996 479 380 33 45 0.9 1.5
1997 5 5 26 42 0.7 1.4
Total 3,878 3,034 223 327 5.8 10.8

Although the number of captures to recaptures between successive seasons was low, there
did appear to be some relation between channel catfIsh movement and flow. Channel catfish
tagged in fall and recaptured in spring (prior to runoff: mean flows near 1,200 cfs) had a
higher frequency of recapture within the same river mile (86%; 6 of 7) than fish recaptured in
spring when mean flows were ~ 3,000 cfs (35%; 8 of 23). Conversely, channel catfish
tagged in spring when mean flows were >- 5,000 cfs and recaptured in fall had a low
frequency of recapture within the same river mile of 14% (12 of 14). In addition, 3 of 3
channel catfish tagged in April and recaptured in May 1993 at flows >- 6,000 cfs had moved
downstream 5.3 to 7.1 river miles (x = 6.5). Mean distance moved did not appear to be
related to flow. However, the three furthest distances moved between successive seasons
occurred between fall 1995 and spring 1996 following the winter test flows when all three
fish moved downstream (49, 72, and 83 river miles; x= 68), There did not appear to be any
relation between common carp movement and flow.

Between 1992 and 1997 three channel catfish were captured four times and ten were captured
three times, Of the three captured on four occasions: one was captured all four times within
the same river mile (3-year span; 490-550 mm TL), another was captured within a 3-mile
section of river (2-year span; 422-470 mm TL), and one was captured in a 66-mile section of
river (3-year span; 448-519 rom TL). The latter was collected twice in a 2-mile section of
river in 1992 (4 month span), captured 64 miles downstream (2-year span), and captured a
fourth time (7 months later) within the same downstream river mile. These movements are
similar to those observed for all channel catfish collectively recaptured from 1992-1997,
There did not appear to be any ontogenetic relation with movement, though only eight fish
tagged -<300 mm TL were recaptured (4 of 8 recaptured in same or adjacent river mile),

San Juan River Non-native Species Interactions, Final Repon, I February 2000

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