8140

• UCREFRP Catalog Number: 8140
• Author: May, B. E., J. D. Leppink and R. S. Wydoski.
• Title: Distribution, Systematics and Biology of the Bonneville Cutthoat Trout,
• USFW Year: 1978.
• Copyright Material: NO

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Abstract ..................... .......... ............................. 1
Introduction ............................. ............................. ].
Distribution ............................. ............................. 4
Historical ............................. ............................. 4
Present ............................... ............................. 5
Taxonomic Description ................... ............................. 5
Biology and Life History ................. ............................. 7
Food Habits ........................... ............................. 7
Age and Growth ....................... .............................12
Population Dynamics
.................. ...........18
..................
Reproduction .......................... .............................19
Management Implications ..............
.. ..........19
...................
Literature Cited .......................... ............................21
Tables
Table 1. Ranges of various subspecies of cutthroat trout in its native range,
Western United States ..................................... 2
Table 2. Habitats that contain known populations of S.c. utah. ........ 6
T;~ble 3. Primary morpholiogical characters of S.c. utah from dif-
ferent streams. Range and mean O of morpholiogical char-
acters . ................................................... 8
Table 4. Food of 39 cutthroat trout (S.c utah) from Birch Creek, Utah
(June 1975). Expressed as percent volume and percent of
occurence ..................................................11
Table 5. Mean calculated total length at the end of each growing season for
cutthroatthroutfrom Birch Creek, Utah . ....................17
Table 6. Density of Bonneville cutthroat trout (S.c. utah) in Birch Creek,
Beaver County; and Trout Creek, Juab County, Utahr. .......18
Figures
Figure 1. Historical range of various subspecies of cutthroat trout in Utah
and adjoining states . ...................................... 3
Figure 2. Meristic counts of basibranchial teeth, gillrakers, pyloric caecae
and scales above the lateral line for various populations of cut-
throat trout from Utah and adjoining states . ... . ............ 9
Figure 3. The number of scales in the lateral line for various populations of
cutthroat trout from Utah and adjoining states . .............10
Figure 4. Comparison of the food habits of Bonneville cutthroat trout
and the benthic organisms from Birch Creek, Beaver County,
Ut,ah ....................................................13
Figure 5. Lengthfrequen~y r~istributions for samples of $onneville cutthroat
trout from + ~: ~ ~ (""reek, Beaver County, and Trout Creek, <Tuab
County, L'° ........ .............. l4