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)

· Each of the six populations
maintained ("no net loss" +
recruitment*); and
· One core population in upper
basin >2,100 adults (MVP); and
· One core population in lower
basin (Grand Canyon) >2,100
ad u Its

*Recruitment: mean estimated
recruitment of age~3 naturally
produced fish equals or .
exceeds adult mortalit .

Delisting
(3 years beyond downlisting)

· Each of the six populations
maintained, ("no net loss" +
recruitment); and
· Two core populations in upper
basin, each >2,100 adults; and
· One core population in lower basin
>2,100 adults

(5 + 3 = 8 years generation time)