7719

• UCREFRP Catalog Number: 7719
• Author: Seethaler, K. H.
• Title: Resume of Current Knowledge on Colorado Squawfish.
• USFW Year: 1976.
• USFW - Doc Type: Logan, Utah.
• Copyright Material: NO

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successful spawning was common. Holden found juveniles to be abundant

at Echo Park in 1968. He found a few in 1969 and none in 1970. He

described collection sites and correlated the movement into the

Yampa from the Green with decreasing turbidity and temperatures of
68-700F in the Yampa.
My study was motivated by the endangered status of the Colorado
squawfish. The YampaRiver was chosen as the area for study. It was
known from the previously described studies that the Green River above
the confluence of the Yampa no longer supported this fish as a result
of alterations caused to the river by the Flaming Gorge Dam.
The Yampa was obviously critical to the survival of this species
in the Upper Green River system. I~ is the last major tributary of
the Colorado system without a dam. It appears to come as close as
any to simulating the original condition of the basin. It was thought
to have the healthiest remaining squawfish population. Since then.
we have learned from George Kidd that Grand Junction has a relatively
good population as well.

Chuck McAda, who is concurrently studying the razorback sucker
(Xyrauchen texanus), initially intended to concentrate on the Yampa
and Upper Green as well. While he has done this, he has found that
the Walter Walker Wildlife Area in Grand Junction is better suited to

provide quantitative data. I have therefore been able to gain

additional information from Grand Junction. My emphasis remains,

however, on the Yampa.
My original objectives were:
1. Delineate spawning areas

2. Describe ecological parameters related to reproductive success