9442

• UCREFRP Catalog Number: 9442
• Author: Muth, R. T. and T. E. Czapla.
• Title: Workshop Summary
• USFW Year: 2002.
• USFW - Doc Type: Designing Methods to Evaluate Stocked Fish in the Upper Colorado River, Green River, and San Juan River Subbasins.
• Copyright Material: NO

Table 1. Demographic recovery criteria for Colorado pikeminnow.

Downlisting (5 years; monitoring) Delisting (7 years after downlisting)
. Maintain metapopulation . Maintain metapopulation
. Green River and upper Colorado . Green River and upper Colorado
River populations maintained ("no net River populations maintained ("no net
loss" + recruitment); and loss" + recruitment); and
. Green River subbasin population . Green River subbasin population
> 2,600 adults; and > 2,600 adults; and
. Upper Colorado River population . Upper Colorado River population
> 700 adults*; and > 1,000 adults OR upper Colorado
. San Juan River establish/maintain River> 700 adults and San Juan River
1,000 age-5+ subadults* population> 800 subadults*
*Based on carrying capacity estimates (and, for San *Based on carrying capacity estimates
Juan River, estimated survival of stocked fish) (5 + 7 = 12 years generation time)

12

# Years

Figure 1. Estimated time to achieve recovery of the Colorado pikeminnow.

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