7963

• UCREFRP Catalog Number: 7963
• Author: U.S. Fish and Wildlife Service.
• Title: Streamflow Needs of Rare and Endangered Fishes
• USFW Year: 1990.
• USFW - Doc Type: Yampa River Interim Flow Recommendations - Final Report.
• Copyright Material: NO

Table 1. Delineation of critical
Colorado River fishes in
limiting factors.
river reaches for rare and endangered
the Yampa River, with notes on potential
Life history Location(RM)a Season Potential limiting factors
Colorado Squawfish
Adult 0-140
Concentration 51-124
Migration 0-140
Spawning 4-31
Larval 0-31
Juvenile 0-140
Adult 0-56
Concentration 4-40
Spawning 12-40
Larval 0-40
Juvenile 0-56
Adult 0-10
Adult 0-13
Spawning 0-4
Larval 0-4
All Year Spring peak flows; overbank
August-May flooding; seeps in spawning
May-August reaches; number of ripe
June-August females; angling or other
July-August incidental takes; siltation
All Year of spawning substrate;
competition and predation
with nonnative fishes; food
availability; stream
blockage; low flows late
summer, fall, and winter;
stability of winter flows.
Humpback Chub
All Year
All Year
May-July
May-July
All Year
Bonytail Chub
All Year
Razorback Sucker
Spring peak flows;
availability of shoreline
eddy habitat and deep
canyon habitat; competition
and predation by nonnative
fishes.
Factors unknown
All Year Spring peak flows; overbank
April-June flooding; number of
April-June reproducing adults;
competition and predation by
nonnative fishes; lack of
substantive recruitment to
juvenile life history stage.
a Numbers represent river miles (rounded) upstream from the mouth of the Yampa
River.
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