7046 ‎(4)‎

• UCREFRP Catalog Number: 7046
• Author: Valdez, R. A., W. J. Masslich and A. Wasowicz.
• Title: Final Report\
• USFW Year: 1992.
• Copyright Material: NO

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Table 25. Number and catch per unit effort (CPE) by species with seines in pools of the

Dolores River, 1990-1991 ........................................... 50

Table 26. Number and catch per unit effort (CPE) by species with seines in isolated
pools of the Dolores River, 1990-1991 ................................. 51
Table 27. Seining catch per unit effort (fIsh/100 m~ for species sampled in the Dolores

River, 1990-1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 52

Table 28. Comparison of seining catch rates (tish/l00 mZ) by species between habitat
types in the Dolores River, 1990-1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 53
Table 29. Catch per 10 hours of effort for tish species captured by gill nets, trammel
nets, and electrotishing in the Dolores River sampled by USFWS, 1981 and
BIO/WEST,199O-1991 ............................................. 54
Table 30. Catch per 100 mZ of area for tish species collected by seine in the Dolores
River by USFWS, 1981 and BIOIWEST, 1990-1991 ....................... 55
Table 31. Composition of tish species captured by gill nets, trammel nets and
electrotishing in six reaches of the Dolores River sampled by USFWS, 1981
and BIO/WEST, 1990-1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 56
Table 32. Composition of tish species captured by seining in five reaches of the Dolores
River sampled by USFWS, 1981 and BIO/WEST, 1990-1991 ................ 57
Table 33. Summary of Dolores River habitat suitability for different life history stages
of Colorado squawfish. Habitat requirements based in HSI curves developed
by USFWS (Valdez et al. 1987) ...................................... 58
Table 34. A summary of average daily flows (cfs) of the Dolores River during the field
trips of the 1990 Dolores River Study. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 59
Table 35. Temperature and water quality data recorded for three Dolores River field
trips, 1990 and three Dolores River fIeld trips, 1991 ....................... 61
Table 36. Summary of water quality for Field Trip 1 of the 1990 Dolores River Study 66
Table 37. Summary of water quality for Field Trip 2 of the 1990 Dolores River Study 67
Table 38. Summary of water quality for Field Trip 3 of the 1990 Dolores River Study 68
Table 39. Summary of water quality for Field Trip 4 of the 1991 Dolores River Study 69
Table 40. Summary of water quality for Field Trip 5 of the 1991 Dolores River Study 70
Table 41. Summary of water quality for Field Trip 6 of the 1991 Dolores River Study 72
Table 42. Historical summary of water chemistry in the Dolores (DO) and San Miguel

(SM) Rivers ..................................................... 74

Table 43. Radium - 226 in Dolores and San Miguel River bottom sediments, 1991. LLD
= Lower Limit of Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 76
Table 44. Historical comparison of Radium - 226 in Dolores and San. Miguel River
bottom sediments at five sample sites. Values represent ranges of
measurements per sample period ..................................... 77
Table 45. Heavy metal analysis of tissue (liver and kidney combined, wet weight) from
three fish species sampled in the Dolores River, 1991 ...................... 78
Table 46. Summary of heavy metal analysis of tissue (liver and kidney combined, wet
weight) from three fish species sampled in the Dolores River, 1991. . . . . . . . . . .. 79
Table 47. Comparison of average metal content of liver or kidney tissue (highest value
is used) of two species of fish collected in the Gunnision River, 1981 (Kunkle
et al. 1983) with average metal content of liver and kidney tissue of three fish
species collected in the Dolores River, 1991 ............................. 79
Table 48. Summary of invertebrate collection during Trip 1 in the Dolores River,

1990 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 80

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