8167

• UCREFRP Catalog Number: 8167
• Author: Nehring, R. B.
• Title: Distribution and Abundance of the Fish Fauna in the Dolores River From McPhee Reservoir Downstream to the Dove Creek Pump Plant.
• USFW Year: 1993.
• USFW - Doc Type: Montrose, Colorado.
• Copyright Material: NO

Table 11. Dolores River (Metaska Campground to Bradfield Bridge) trout
population density and biomass estimates, May 13-16, 1991, June 15-18,
1992, and July 9-13,1993.

Year 1991 1992 1993
size (cm) N kg/ha N kg/ha N kg/ha
,
Brown Trout
~ 15 1006 14.1 1320 12.8 2618 21. 0
~ 30 439 9.2 584 9.9 691 14.1
~ 35 321 7.6 465 8.9 517 12.3
~ 40 214 5.6 288 6.6 353 9.8
"Wild" Rainbow Trouta
~ 15 586 10.2 459 9.0 552 12.1
~ 30 352 8.1 354 8.6 406 11.5
~ 35 291 7.1 303 8.0 364 11.1
~ 40 196 5.1 231 6.9 255 9.2
Snake River Cutthroat Trout
~ 15 433 4.4 52 0.9 38 1.1
~ 30 76 2.1 45 0.9 37 1.1
~ 35 71 2.0 28 0.7 33 1.1
~ 40 64 1.9 15 0.5 27 1.0
All "Wild" Trouta
~ 15 2039 28.8 1771 22.6 2878 34.3
~ 30 896 26.4 1002 19.3 1063 26.7
~ 35 698 24.8 813 17.6 862 24.5
~ 40 485 21. 6 553 14.0 609 20.0

a Estimates are for stream-reared trout only; does not include rainbow trout or
kokanee salmon from McPhee Lake that spilled into the Dolores River during the
managed spill of 1993.

Table 12. Brown trout fry numbers (5 - 15 cm) captured while electrofishing the
Dolores River below McPhee Dam, 1988 - 1991

.
Station Description Sampling Period
(River Mile)
10/88 9/89 10/90 10/91 10192
Metaska Campground (0.5) 6 4 10 15 35
Ferris Canyon (6.0) 3 0 19 80 80
Rock Stockpile Site (10.0) 12 36 26 45 71
Total All Stations 21 40 55 140 186

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