8141A

• UCREFRP Catalog Number: 8141A
• Author: Wydoski, R. S. and W. T. Helm.
• Title: Effects of Alterations to Low Gradient Reaches of Utah Streams.
• USFW Year: 1980.
• USFW - Doc Type: \
• Copyright Material: NO

Number

Page

13

Movement of brown trout greater than 250 mm FL to and
from study sites in the Logan and Blacksmith Fork Rivers,
Cache County, Utah by stage of streamflow, 1975-76 . .

70

14

Number of brown trout immigrating into the study sites
of the Logan and Blacksmith Fork Rivers, Cache County,
Utah by streamflow and spawning season .'. . . . . .

Comparison of estimated mean weights (g) for brown
trout at the end of each year of life from selected

U. S. wa ters. . . . . . . . . . . . . . . . . . . . .

76

71

15

16

Population estimates (no/ha) of brown trout by year
class for the control site in the Blacksmith Fork
River, Cache County, Utah. . . . . . . . . . . . . .

Population estimates (no/ha) of brown trout by year
class for the control site in the Logan River, Cache
Coun ty, Uta h . . . . . . . . . . . . . . . . . . . .

Population estimates (no/ha) of brown trout by year
class for the total bulldozed site (0-500 m) in the
Logan River, Cache County, Utah. . . . . . . . . . .

79

77

17

78

18

19 Population estimates (no/ha) of brown trout by year class
for the stable bulldozed site (123-500 m) in the Logan
River, Cache County, Utah, 1975-76 . . . . . . . . . . . . . . . . 81

20 Population estimates (no/ha) of brown trout by year class
for the recently bulldozed site in the Blacksmith Fork
River, Cache County, Utah, 1975-76 . . . . . . . . . .. .... 82

21 Population estimates (no/ha) of brown trout by year
class for the old bulldozed site in the Blacksmith Fork
Rive~ Cache County, Utah, 1975-76. . . . . . . . . . . . . . . . . 83

22 Population estimates (no/ha) of brown trout by year class
for the recently dredged site in the Blacksmith Fork
River, Cache County, Utah, 1975-76 . . . . . . . . . . . . . . . . 85

23 Mean annual population (no/ha) and percent composition ( )
by age group of brown trout in six study sites of the Logan
and Blacksmith Fork Rivers, Cache County, Utah, 1975-76. . . 91

24 Biomass (kg/ha) of brown trout by year class for the control
site in the Blacksmith Fork River, Cache County, Utah

1975- 76 . . . . . . . . . . . . . . . . . . . . . . . . . 92

25 Production (kg/ha) of brown trout by year class for the
control site in the Blacksmith Fork River, Cache County,

xv