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 Coloraodo
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

*Recruitment: mean estimated
recruitment of age-5 and age-6
naturally produced fish equals or
exceeds adult mortality.

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

(5 + 7 = 12 years generation time)