Operational Plan for the Restoration of Diadromous Fishes to the ...

• Measure 1b: Sub-drainages with growth rate R equal to or greater
than 1.
o Estimate from adult to adult cohort returns (trap census or redd
counts)
o Estimate using modeling (PVA or matrix etc.) based on other
available life stage data.
� Strategy- focus management activities and assessments
on population growth rates. Sub-drainages where natural
reproduction is inadequate will never recover.
Management must focus on growth rates as well as
population size.
� Develop assessment plan that will allow detection of subdrainage
growth rates (e.g. concentrated redd counts,
proportional adult returns estimated by telemetry etc.)
Table 1. Year and Percentage of Criteria Met for Sub-drainages 1-7
Sub-Drainage
Year 1 2 3 4 5 6 7
0 0 % 0 % 0 % 0 % 0 % 0 % 0 %
5 20 % all 0 % 0 % 0 % 0 % 0 % 0 %
10 20 % wild 20 % all 0 % 0 % 0 % 0 % 0 %
15 50 % wild 20 % wild 20 % all 20 % all 0 % 0 % 0 %
20 90 % wild 50 % wild 20 % wild 20 % wild 20 % all 20 % all 20 % all
25 restored 90 % wild 50 % wild 50 % wild 20 % wild 20 % wild 20 % wild
30 restored restored 90 % wild 90 % wild 50 % wild 50 % wild 50 % wild
35 restored restored restored restored 90 % wild 90 % wild 90 % wild
40 restored restored restored restored restored restored restored
Key to table:
0 % No demographic measures achieved
20 % all 20 % of demographic measures is achieved considering both wild and
hatchery fish.
20 % to 90 % wild 20 % to 90 % of demographic measures is achieved by wild fish only.
restored All demographic measures achieved with a wild population (no hatchery
supplementation).
Figure 2. Generalized Sub-Drainage Recovery and Percentage Wild Fish Curves
PRFP Page 181