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MERCURY IN CENTRAL VALLEY SPORT FISH

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MERCURY IN CENTRAL VALLEY
SPORT FISH
• Review of Historical Data –
Letitia Grenier
• Results from 2005 – Letitia
Grenier
• Plans for 2006
• Overview – Jay Davis
• Selecting Advisory
Development Sites – Margy
Gassel
Plans for Sport Fish Monitoring and Data
Analysis in the Next 12 Months
• Overall sampling design for sport
fish – Jay Davis
• Selecting Advisory Development
Sites: “The Matrix” – Margy
Gassel
• Other data analysis tasks for
sport fish – Jay Davis
• Spatial analysis of sport fish data
• Largemouth bass accumulation
model
Sport Fish Sampling Plan, Years 1 - 3
Year
Index
Sites
2005
6
Inten Restor
ation/
sive
Sites Remedi
ation
Sites
3
2006
2007
6
3
Advisor
y
Develop
ment
Sites
Chin
ook
Salm
on
Steel
head
Rain
bow
Trou
t
4
30
35
fish
30
fish
50
fish
3
30
2
30
Stri
ped
Bas
s
Sturg
eon
Ameri
can
Shad
100
fish
15
fish
25
fish
Sport Fish
Sampling in 2006
•
•
•
•
Index – none
Intensive – none
Restoration – 3
Advisory
Development ~35
• Anadromous
species
THE MATRIX
Margy Gassel
Other Data Analysis Tasks for Sport Fish
• Largemouth bass accumulation model
• Spatial analysis of historical and present
sport fish data
Largemouth Bass Hg Uptake Modeling
• Led by Ben Greenfield
• What are the mechanisms driving
differences in Hg concentration?
Largemouth Bass Hg Modeling Approach
•
•
Evaluate 6 Intensive/Index sites varying in Hg
Combination of statistical and mechanistic
modeling to test four hypotheses
1. Differences in prey Hg concentrations
•
Compare bass vs. small fish Hg in multiple sites
2. Differences in fish growth rates
•
Age and growth rate analysis. Bioenergetic model.
3. Differences in fish consumption rates
•
Hg mass balance model and Bioenergetic model
4. Differences in fish trophic position (or prey types
consumed)
•
Gut content analysis and Bioenergetic model
Largemouth Bass Hg Modeling
• Work performed to date: field data collection
• Collection of individual fish for analysis in
coordination with sport fish monitoring
• 58 bass collected Aug/Sept 2005
• Target analytes include muscle Hg, whole body Hg, age
(scales), gut contents
• Darell Slotton’s prey fish will estimate prey Hg and caloric
content
Largemouth Bass Hg Modeling
• Future work schedule
• Discuss workplan with Review Panel
• Fall/Winter 2006 Modeling, sensitivity analysis
• Tentative: Spring 2007 Laboratory analysis
• Possible determination of prey item caloric density based on
sensitivity analysis
• Tentative: Spring/Summer 2007 Possible additional field
collection
• Sample collection based on sensitivity of model results
• Tentative: Fall 2007 Revised modeling work
• Based on results from 2005 and 2007 data
• Winter 2007 Report on modeling study
Spatial Statistical Model
• Letitia Grenier, Don
Stevens, et al.
• Can summarize spatial
patterns in historic data
• Can make predictions for
unsampled locations
• Identify gaps in
information
• Can examine
relationships with
variables such as land
use (mines, wetlands,
urban), effluent discharge
• Draft report this fall
MERCURY IN CENTRAL VALLEY SPORT
FISH: Desired Outcomes for Today
• Comments on the technical
report: statistical approaches,
data presentation
• Input on 2006 Sampling Plan:
locations, species
• Approval of general sampling
design presented in 2006
Sampling Plan
DEVELOPING SAFE CONSUMPTION
GUIDELINES: Desired Outcomes for Today
• Feedback on progress
• Feedback on plans
STAKEHOLDER INVOLVEMENT AND RISK
COMMUNICATION: Desired Outcomes for
Today
• Feedback on progress
• Feedback on plans
Largemouth Bass Hg Modeling
Approach
• Evaluate 6 Intensive/Index sites varying in Hg
Intensive Sites
Hg Level
Frank’s Tract
Low
Prospect Slough
Moderate
Cosumnes River
High
Index Sites
Sacramento River at RM44
High
San Joaquin River at Vernalis
High
Sacramento River at Rio Vista
High
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