9594

• UCREFRP Catalog Number: 9594
• Author: Colorado Division of Wildlife and e. al.
• Title: Procedures for Stocking Nonnative Fish Species in the Upper Colorado River Basin.
• USFW Year: 1996.
• USFW - Doc Type: \
• Copyright Material: NO

C. The potential for escapement, the potential for survival in
critical habitat if escapement occurs, and control measures
that could be implemented to reduce the risk of escapement.
D. The potential for impact to threatened and endangered species
and the specific measures available to remedy any impacts that
may occur including their feasibility and likelihood of
success.
E. A plan for monitoring the effects of stocking nonnative fishes
on the endangered Colorado River fishes.
VI. STOCKING OF NONNATIVE FISHES THAT DO NOT PRESENTLY OCCUR IN THE UPPER
COLORADO RIVER BASIN
1. The States and the Service recognize that introducing new fish
species, including hybrids, into an ecosystem can result in
unanticipated impacts on native fishes. For this reason, few
proposals, if any, to introduce new fish species or hybrids into
the Upper Basin are anticipated. Introduction of new species will
generally be discouraged.
Minimum criteria for stocking will include: 1) no stocking of
isolated ponds within the 50-year floodplain and 2) if the water
has an outlet, it must be screened or managed to control
escapement. Stocking should be "confined to areas where absence of
potential conflict with rare or endangered species can be
demonstrated" (U.S. Fish and Wildlife Service 1987).
2. Proposals to stock fishes that do not presently occur in the basin
will be subject to case-by-case review by the State wildlife agency
and the Service and will include the following minimal information:
A. The purpose and location of the proposed stocking.
B. The species, numbers, and rationale for selecting the species.
C. The potential for escapement, the potential for survival in
critical habitat if escapement occurs, and control measures
that could be implemented to reduce the risk of escapement.
D. The potential for impact to threatened and endangered species
and the specific measures available to remedy any impacts that
may occur including their feasibility and likelihood of
success.
E. A plan for monitoring the effects of stocking nonnative fishes
on the endangered Colorado River fishes.
3. Any proposal to introduce new fish species into the Upper Basin
shall also follow the rationale and justification of the American
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