7327

• UCREFRP Catalog Number: 7327
• Author: Johnson, J. E.
• Title: Status of Endangered and Threatened Fish Species in Colorado.
• USFW Year: 1976.
• USFW - Doc Type: T/N 280,
• Copyright Material: NO

Table 1. Comparison of selected parameters for various Colorado subspecies
of Salmo clarki and rainbow trout

Number
vertebrae
Number
pyloric
caeca

Number
gill-rakers
Number
basibranchial
teeth Lateral line
scale count
(2 rows above
lateral line) Scale count
from lateral
line to
dorsal fin

pots
mean mean mean mean mean nw an
(range) (range) (range) (range) (range) (range)
5. clarki stomias 60.6 29.4 20.5 usually 195.0 48.0 Large ,
(Greenback cutthroat present absent from
trout)* (59-62) (24-42) (17-22) ( 0-15) (175-214) (46-53) head
S. cinrki virBinal.is Med. size,
CHio Grande cutthroat 61.7 46.0 19.5 7.3 164.0 41.9 concentrated
trout)* (60-63) (33-59) (18-21) ( 4-12) (146-186) (39-47) posteriorly
S. clarki pleuriticus usually Large spots
[k) r;n5 61.2 3:510 1910 pr.osent 180 43.0 concentrated
cutthroat trout)* (60-63) (23-46) (16-21) ( 0.•15) (159-202) (31-51) posteriorly
S. clarki macdonaldi Spots small,
(yellowfin cutthroat 60.6 42.0 21,3 15.5 161.7 41.3 irregular
trout)* (60-61) (32-49) (20-22) (15-16) (149-172) (38-46) shape
S, clarki lewisi
(Yellowstone cutthroat 61.6 41.2 20.6 24.0 179.2 40.6
trout) (60-63) (31-51) (18-23) ( 9-46) (161-187) (37-46)
S. gnirdneri 63.0 55 19.0 130 27 Small, equally
(rainbow trout) (62-65) (40-70) (18-21) absent (120-140) (24-30) distributed
* Counts from populations thought to be pure strains and typical
of the subspecies. (From Behnke, 1973 a, b, c; Wernsman, 1973)