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 4.

Mean distance (river miles) between recapture and original or last capture
locations for channel catfish (ICTPUN) and common carp (CYPCAR) in the San
Juan River by year, 1992-1997, N = sample size, S,E, = standard error.

ICTPUN N S,E. CYPCAR N S.E.
1992 7,7 30 3.1 4.6 10 3.7
1993 9.9 26 2.3 2.8 54 0.9
1994 10,2 31 3.5 3,1 49 0.7
1995 14,0 37 3.1 7.6 82 1.9
1996 15.8 32 4.4 8,6 44 3.3
1997 20.0 26 6.0 4,8 42 2.0
1992-1997 12.9 182 1.5 5.5 281 0,8

One channel catfish (SIR 02180) captured three times in a one year span was collected twice in
two successive falls within the same river mile and captured 23 miles downstream in the
intervening spring. Another channel catfish (SIR 0250 I) captured three times in a one year span
was captured in three different locations 31 miles apart, Two other channel catfish captured over
a 4+ year span (FWS 00843 and SIR 01531) were recaptured within the same river mile, These
movements support the overall frequency and me.an movement patterns observed for all tagged
channel catfish (Figure 8).

There were 27 common carp multiple captures including seven that were captured four times and
20 that were captured three times, Of the seven captured on four occasions: one was captured all
four times within the same river mile (5 year span; 442-529 mm TL), three were captured within
a 5 mile section of river(2- 3 year span), two were captured withi n a 10 mile section of ri ver (1-2
year span), and one was captured in a 85 mile section of river (4 year span; 501-S50 mm TL).
Only two of 20 common carp captured three times were captured within the same river mile.
Though the frequency of movement was somewhat greater for multiple common carp captures
than that observed for all common carp recaptured collectively, the range and average distance
moved was similar, We could not detemine any ontogenetic relation with movement since only
one juvenile fish (-<250 mm TL) tagged was recaptured,

San Juan Rive, Non-native Species Interactions, Final Report, ] February 2000

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