6042

• UCREFRP Catalog Number: 6042
• Author: Haynes, C. M., R. T. Muth and T. P. Nesler.
• Title: Identification of Habitat Requirements and Limiting Factors For Colorado Squawfish and Humpback Chub.
• USFW Year: 1985.
• USFW - Doc Type: Fort Collins, Colorado.
• Copyright Material: NO

14

The 10 species and 118 individuals collected in 48 drift-net samples in
1982 were also predominantly cyprinid and catostomid larvae; juvenile and
adult forms contributed less than 3% (Table 3). Native species accounted for
91% of all fish caught. Bluehead sucker, speckled dace, and Gila spp. were
the predominant native species, constituting 29%, 27%, and 25% of the total
catch, respectively. Channel catfish (Ictalurus punctatus) was the most
commonly sampled non-native species (6% of total catch).

Table 3. Fishes collected during July-August
1982 drift-net sampling in the Black
Rocks area (river km 219.8-218.2),
Colorado River, Colorado. N=number
of fish sampled; %T=% of total number
of fish sampled; %FO=frequency of
occurrence (% of total number of
samples containing a particular
species, based on 48 samples).

Taxon N %T %FO
CYPRINIDAE 67 57 34
Cyprinus carEio 1 1 2
Gila robusta 1 1 2
Gila spp.a 30 25 21
Pimephales promelas 1 1 2
Ptychochei1us 1uciusa 2 2 4
Rhinichthys osculusa 32 27 25
CATOSTOMIDAE 43 36 33
Catostomus discobolusa 35 29 29
~. latipinnisa 8 7 15
I CTALURIDAE
Ictalurus punctatus 7 6 10
CENTRARCHIDAE
Lepomis cyanellus 1 1 2
NATIVES 108 92 48
NON-NATIVES 10 8 15
TOTAL 118
aNative species