9694

• UCREFRP Catalog Number: 9694
• Author: Hawkins, J., C. Walford, and A. Hill
• Title: Smallmouth bass control in the middle Yampa River, 2003-2007.
• USFW Year: 2009
• USFW - Doc Type: Contribution 154 Larval Fish Laboratory, Colorado State University.
• Copyright Material: NO

CONCLUSIONS

.

Smallmouth bass are the most abundant nonnative predator in the middle
Yampa River.
Little Yampa Canyon and particularly Lily Park, contained high densities of
smallmouth bass.
Abundance of small mouth bass declined after intensive removal but it was
unknown whether the reduction was caused by removal, environmental factors,
or a combination of both.
Smallmouth bass moved long distances in both up and downstream directions in
the Yampa River.
Some smallmouth bass that were translocated into Elkhead Reservoir escaped
and dispersed downstream to the Yampa River, including into our study sites.
Mechanical removal effectiveness was partially offset by immigration and
recruitment of fish into each study site.
Floy tag loss was not detected during the short mark-recapture period required to
estimate abundance.
Diversity and abundance of most native fishes has declined in the study reaches
compared to twenty years ago.

.

.

.

.

.

.

26