9458

• UCREFRP Catalog Number: 9458
• Author: National Park Service.
• Title: Workshop on Population Estimates for Colorado Pikeminnow and Humpback Chub.
• USFW Year: 2001.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

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Downlisting
(5 years; monitoring)

· Maintain metapopulation
· Green River and upper Colorado
River populations maintained ("no
net loss" + recruitment); and
· Green River subbasin population
>2,600 adults (MVP)*; and
· Upper Colorado River population
> 700 adults**" and
,

· San Juan River establish/maintain
1,000 age-5+ subadults**

*Currently exceeding number
**Based on carrying capacity
estimates (and San Juan,
estimated survival of stocked fish)

Delisting
(7 years beyond down listing)

· Maintain metapopulation
· Green River and upper Colorado
River populations maintained
("no net loss" + recruitment);
and
· Green River core population
>2,600 adults; and
· Upper Colorado River population
. >1,000 adults OR upper
Colorado River population> 700
adults and San Juan River
population >800 adults*

*Based on carrying capacity
estimates
(5 + 7 = 12 years generation ti me)