7004

• UCREFRP Catalog Number: 7004
• Author: McAda, C. W., C. R. Berry and C. E. Phillips
• Title: Distribution of Fishes in the San Rafael River System of the Upper Colorado River System
• USFW Year: 1980
• USFW - Doc Type: The Southwestern Naturalist
• Copyright Material: NO

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Fig. 3. Colorado :quowflsh (upper: 35 mm total length) and roundtoil chub (44 mm
total length) collected in October from station 1. n
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than 3,000 fish collected, 61 % were taken in June. Increased same- tl

ling efficiency due to lower water probably accounted for these o,
larger collections in June. Sampling inefficiency, differences in •~
sampling gear, and the variable nature of irrigation water removal '"
from the streams obscured other more specific observations on sea-
sonal population fluctuations. ~ ~
Throughout the course of the investigation, certain habitat pref-
erences of native fish were apparent. Speckled dace and bluehead ~ ~
suckers were usually found in a deep riffle or shallow glide over °o ~
cobble- or rubble-covered bottom. Flannelmouth suckers usually ~ '

preferred the lower portions of a glide or pool, where a mud or ~
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silt bottom was present. Roundtail chubs were usually found in the y
deepest parts of pools. ~ c
Water quality characteristtcs.-Samples taken during this study C
corresponded with data collected by the U.S. Geological Survey •~ ~
(1971-75). Dissolved oxygen ranged from a high 11 mg/1 in March ,a ,i
and April to a low of 1 mgJl in isolated pools in October (Table 2). o
Total alkalinity ranged from 150 to 510 mg/1; hardness from 1,400 'tl ~
to 1,920 mg/1; conductivity from 2,250 to 7,800 µohms, and phH

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