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

Table 4.
Food of 39 cutthroat trout (S. c. utah) from Birch Creek, Utah (June 1975). Expressed as
percent volume and percent of occurrence.
Immature Mature Females Mature Males
58-100 mm 104-195 mm 112-220 mm
Food Items n=
- - -- --- -- 22
------ - n
------- =9
---------- n
- =8

Frequency of
Frequency of -
----- --
Frequency of
Volume Occurrence Volume Occurrence Volume Occurrence
(% of Total) (% of Fish) {% of Total) (% of Fish) (% of Total) (% of Flsh)
Terrestrial
Orthoptera (Grasshoppers) 4.1 .9 -- -- 5.6 25.0
Hymenoptera (Ants, Bees, 7.2 45.5 31.5 1 D0.0 25.2 100.0
wasps)
Spiders - - -- 1.0 i 1.1 2.3 37.5
Aquatic
Diptera (midges)
Chironomidae 29.1 95.5 3.2 77.8 4.7 100.0 Tr
blackfly 1.5 63.6 2.7 100.0 2,8 87.5 Tr
other diptera (march fly, 7.2 31.8 4.1 100.0 2.8 62.5
tipulids, red color fly)
Plecoptera 26.5 61.8 21.5 100.0 16.4 87.5
Tricoptera -- 36.4 6.4 100.0 3.7 75.0
Coleoptera 1.0 45.5 8.2 88.8 12.2 87.5
Ephemeroptera -- 18.2 Tr -- 22.2 .5 100.0 Tr
Unidentifiable insects and
partially digested insects 6.1 95.5 8.2 100.0 11.7 100.0
Debris and detritus 15,3 100.0 13.2 100.0 11.7 100.0
Other organisms 2.0 4.5 -- -- -- --
Gravel and parasites forrned 0 .5 / of the Yotal volume.
Tr =Trace