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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moved upstream was 119,0 river miles and maximum distance moved downstream was 88.0
river miles. Common carp were recaptured an average distance of 5.5 river miles from the
original or last capture location between 1992 and 1997: maximum distance moved upstream
was 84,0 river miles and maximum distance moved downstream was 126,0 river miles. Average
distance moved by year for channel catfish ranged from 7,7 to 20.0 river miles and for common
carp ranged from 2,8 to 8.6 river miles, Though average distance moved differed between
channel catfish and common carp, 32% of all channel catfish and 33% of all common carp were
tagged and recaptured in the same river mile.

SAN JUAN RIVER 1987-97
NONNATIVE COLLECTIONS

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YEAR

Relative abundance of non-native fish species collected during San Juan River
main channel electrofishing surveys, 1987-1997. Results for 1987-1990 were
modified from Platania (1990),

Figure 3.

Channel catfish and common carp tagged and recaptured in succeeding seasons exhibited distinct
movement patterns. Both channel catfish and common carp tagged in spring were typically
recaptured in the same river mile or upstream in fall (Figure 7). Conversely, channel catfish and
common carp tagged in fall were typically recaptured in the same river mile or downstream in
spring (Figure 8). Channel catfish tagged in summer and recaptured in fall showed similar
frequency of movement as spring to fall capture-recaptures (Figure 9). Channel catfish tagged in
July and recaptured in fall moved furthest on average (x := 26 miles, n := 9), Common carp
tagged in summer and recaptured in fall had the lowest mean movement and the highest
frequency of recapture within the same river mile (Figure 9).

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

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