8171

• UCREFRP Catalog Number: 8171
• Author: U.S. Fish and Wildlife Service.
• Title: A Study to Determine the Biological Feasibility of Pit Tags for Endangered Fishes in the Upper Colorado River Basin.
• USFW Year: 1990.
• USFW - Doc Type: Grand Junction, Colorado.
• Copyright Material: NO

Table 1 (continued). Summary of the size and number of roundtail chub, razorback sucker and Colorado squawfish at the start
of the study, and tag retention (Tag Ret.tag verification (Tag Ver.), and the number of fish recovered
over time.
No. of Fish
Study Site Size of Fish at Release at the start No. Tag Tag No. Tag Tag No. Tag Tag No. Tag Tag No. Tag Tag
Species TL (mm) Wt (g) of study of Ret. Ver. of Ret. Ver. of Ret. Var. of Rat. Var. of Ret. Var.
Treatment Range Mean Range Mean (Day 0) Fish X X Fish X X Fish X X Fish X X Fish X X
Day of Observation
Humphrey Pond 2- 18 163
Razorback
sucker
Control --- --- --- --- 0 --- --- --- --- --- --- --- --- ---
Dorsal muse. --- --- --- --- 0 --- --- --- --- --- --- --- --- --
Body cavity 415-429 422 852-984 905 3 3 100 100 0 --- --- 3 100 100
Day of Observation
I--Hotchkiss NFH' 2 70°
Colorado
squawfish
Control 122-152 136 10- 21 15 38 38 --- --- 35 --- ---
Dorsal must. --- --- --- --- 0 0 --- --- --- --- ---
Body cavity 125-165 143 11- 28 18 37 37 100 100 34 100 100
'Fish were held in live cars for two days following handling and tagging before release.
'Study ongoing.
`Six fish (3 control and 3 PIT tagged) were accidently lost during cleaning and flushing of water from the tank.