7890

• UCREFRP Catalog Number: 7890
• Author: U.S. Fish and Wildlife Service.
• Title: Region 6, Fish and Wildlife Service Guidelines Directing Captive Propagation Of Listed And Candidate Fish.
• USFW Year: 1996.
• USFW - Doc Type: \
• Copyright Material: NO

B. ' ocedures for Reviewing Stock Identification and Characterization. A
system similar to that used in the Upper Colorado River should be considered
for other watersheds within the Region. A Biology Committee and an Ad Hoc
panel of fishery geneticists periodically reviewing presumptive stocks as
new information becomes available on distribution, behavior, migrations,
movement, phenotypic and genetic information. Even with available criteria
for stock identification and characterization, ability to evaluate and
classify stocks is not perfect. Therefore, all stocks will be treated
separately until information indicates otherwise.
C. Criteria for Determining Fish Stock Status and Trend-. Determination of
status and trend among various stocks is imperative for making informed
management decisions (Philipp et al. 1986). Action regarding listed and
candidate species must be made on a case-by-case basis using standard
criteria (Rohlf 1991). The status or trend of presumptive fish stocks is
determined by:
1. Monitoring distribution and relative abundance of presumptive stocks,
documenting spawning and recruitment;
2. Monitoring community structure including predators, competitors, and
potential hybridizers;
3. Evaluating and assessing risk(s) for extinction from catastrophic
events;
4. Estimating probability of immediate extinction.
IV. GENETICS NANAGENENT OF WILD STOCKS
All presumptive stocks of listed and candidate fishes must be protected since
each may have unique genetic attributes important to their restoration and
recovery (Philipp et al. 1986; Rohlf 1991). As stocks decline to a point where
they become listed or candidates, each remaining stock would play a more
important role in their recovery (Rohlf 1991). The need for management actions
such as translocation and establishment of captive populations suggests that
restoration and recovery efforts may have been initiated too late for some
species (Tear et al. 1993). Natural propagation will be given the first priority
in restoration and recovery efforts (Figure 1). Wild broodstocks will be given
strong consideration and evaluated before any type of captive program is
initiated. However, captive propagation of some stocks will be needed and
broodstock(s) will be necessary.
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