7742

• UCREFRP Catalog Number: 7742
• Author: Gilpin, M.
• Title: A Population Viability Analysis of the Colorado Squawfish in the Upper Colorado River Basin
• USFW Year: 1993.
• USFW - Doc Type: A Report to the United States Fish and Wildlife Service, Denver, Colorado.
• Copyright Material: NO

Squawfish Population Viability Analysis --July 1993

Page 35

80
70
60
C 50
::I
o
U 40
30
20
10

~
~

o -~--
500 550 600 650 700 750 800 850 900 950 1000
Length

Figure 3.4. Present day adult length distribution for the Colorado
squawfish.

Figure 3.5 shows a very simple demonstration of this effect. The adult
survival rate is increased from 0.81 to 0.95, with a corresponding
stretching out of the tail of the length distribution. There must certainly
have been other factors acting.