Coming together to restore river herring throughout their range. Kim Damon-Randall Diane Borggaard Dan Kircheis Tara Trinko Lake. ESA Listing Decision Timeline. August 2011 – petitioned by NRDC to list river herring under the ESA
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Coming together to restore river herring throughout their range
Tara Trinko Lake
A. the present or threatened destruction, modification, or curtailment of its habitat or range;
B. overutilization for commercial, recreational, scientific, or educational purposes;
C. disease or predation;
D. the inadequacy of existing regulatory mechanisms;
E. other natural or manmade factors affecting its continued existence
Distinct Population Segment Determination
Qualitative threats assessment (QTA)
QTA Process and Definitions
•Incidental catch, climate change, dredging, water quality, water withdrawal/outfall, predation, and existing regulation were among the more important threats after dams for both species, and for all stock complexes (ranking= moderately low to moderate).
•Water quality, water withdrawal/outfall, predation, climate change and climate variability were generally seen as greater threats to both species in the southern portion of their range.
•Commercial harvest was identified as being notably more important in Canada than in the United States.
QTA - Alewife
QTA – Blueback herring
Criteria to Determine Risk Thresholds
Important to have 3 contiguous stock complexes that are stable or significantly increasing:
Tier B established risk thresholds considered in light of the results of the trend analysis.
Population growth rate maximum likelihood estimates (ML.Est), associated standard errors (Std.Err) and lower and upper 95% confidence intervals (low.CI, up.CI) for each range-wide model run. The preferred model run (lowest AIC) for each species is highlighted in grey.
Population growth rate maximum likelihood estimates (ML.Est), associated standard errors (Std.Err) and lower and upper 95% confidence intervals (low.CI, up.CI) for each stock-specific model run. The preferred model run (lowest AIC) for each stock is highlighted in grey.
Blueback herring –
Purpose of proactive conservation effort
grant to ASMFC to initiate this effort
Technical Expert Working Group (TEWG)
Specific subgroups to be identified by
TEWG. Possible groups include:
Goals of subgroups
Goals of TEWG