9509

• UCREFRP Catalog Number: 9509
• Author: Hill, C. G.
• Title: Dynamics of Northern Pike Spawning and Nursery Habitat in the Yampa River, Colorado.
• USFW Year: 2004.
• USFW - Doc Type: Fort Collins, Colorado.
• Copyright Material: NO

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5000
4500
4000 YOY first
YOY observed
Ci) 3500 Spawning Egg attached to 24~55
.... Period incubation vegetation mID ~
~ 3000
CI) ~ ~ ~
~ 2500
co
.s:::. 2000
u
In
C 1500
1000
500
0
..... se 1.0 C\I 0) se ('I) 0 "'" ~ 0 "'" ...,.
- ..... ~ ~ ..... ~ ~ ..... ..... ~
...,. ...,. - 1.0 - CD - -
...,. ...,. ...,. 1.0 1.0 1.0 CD CD CD

Figure 6. A timeline for likely northern pike maturation in the Yampa River and flows
for April 1, 2003 to June 30, 2003. Development stages based on Swift (1965) and
Billard (1996). We first observed young of the year northern pike in the river
backwaters on June 17,2003.