9485

• UCREFRP Catalog Number: 9485
• Author: McAda, C. W., J. W. Bates, J. S. Cranney, T. E. Chart, M. A. Trammell and W. R. Elblad.
• Title: Interagency Standardized Monitoring Program Summary of Results, 1993.
• USFW Year: 1994.
• USFW - Doc Type: Denver.
• Copyright Material: NO

m 3o Reach 1
U B24
m 20 F~
O
U 10
N ~ n .4 .7 .8 .9 ,4 1
L 0
_N I I I I I I I i
LL 86 87 88 89 90 91 92 93
d
30 ~-q Reach 2
O 20

13
C 10 9

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a.
86 87 88 89 90 91 92 93
Year
30 ~
21
20
10
0 _
Reach 3
.6 ?
25
86 87 88 89 90 91 92 93
3o Reach 4
20 19
10 7
4 3 3 2 3 4
0
86 87 88 89 90 91 92 93
Year
Figure 6.-Percentage of the total catch in the first seine haul of primary backwaters comprised of
native fishes during fall ISMP sampling in the Green and Colorado rivers, 1986-1993.
Although native species increased in abundance, introduced species were still the most common
species collected. Three species (fathead minnow Pimephales promelas, red shiner Gyprinella
lutrensis, and sand shiner Notropis stramineus) dominated the collections, just as they have since
ISMP began. In Reach 4, catch rates for fathead minnow and red shiner increased somewhat (Figure
7). However, catch rates for the three species declined or remained fairly steady in the remaining
reaches. Nonetheless, these three species composed 75 to 989 of all fishes collected during fall
seining (Table A-5).
7