Alaska Department of Fish and Game Alaska …...Improving and Protecting Alaska's Water Quality 4...
Transcript of Alaska Department of Fish and Game Alaska …...Improving and Protecting Alaska's Water Quality 4...
Alaska Department of Fish and Game Alaska Department of Environmental Conservation
ATCEM 2018
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Outline Purpose of ADF&G/DEC collaborative effort to develop Alaska-
specific fish consumption rates (FCRs) Methods for deriving FCRs Results Application to DEC Human Health Criteria revision effort
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Based on dietary survey responses Food diary for a person or household, or Interviews asking people to recall what they ate
Example: Jane eats 8 ounces (serving size) of fish three times per week (e.g., one lunch and two dinners). If you assume this happens every week over the
course of a year Jane’s FCR is 72.65 g/day
What is a fish consumption rate? (FCR)
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HHC are Highest concentration of a chemical in surface water not expected to pose a significant risk to human health
What are human health criteria?
Fish Consumption Rates v. Fish Consumption Advisories
A Fish Consumption Rate is used in the HHC process to determine the how much exposure to a pollutant a person may experience through the consumption of fish.
A Fish Consumption Advisory is used to alert people that pollutants have been detected in fish/shellfish at levels that may be unsafe for unlimited consumption.
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DEC Human Health Technical Workgroup Determined that the ADF&G Division of Subsistence was the best
‘source’ of relevant information
Included harvest data from rural communities across Alaska Included a methodology for deriving fish consumption rates from
harvest data Dataset covers multiple years Includes a broad range of different species consumed by Alaskans.
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Division of Subsistence: Statutory Duties Alaska Statute 16.05.094
lists “duties”1. Research and data
compilation 2. Data reporting and
education 3. Application of study
findings
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Subsistence fishing and processing, Chignik Lake
ADF&G Community Subsistence Information System or “CSIS”
ADF&G used data from 110 Communities
Collected between 2008 and 2015
Considered a range of aquatic species from both fresh and marine waters
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Methods: Mean Per Capita Use
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𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑦𝑦′𝑠𝑠 𝑀𝑀𝑀𝑀𝑀𝑀𝐶𝐶 𝑃𝑃𝑀𝑀𝑃𝑃 𝐶𝐶𝑀𝑀𝐶𝐶𝐶𝐶𝐶𝐶𝑀𝑀 𝐻𝐻𝑀𝑀𝑃𝑃𝐻𝐻𝑀𝑀𝑠𝑠𝐶𝐶𝑃𝑃𝑀𝑀𝑃𝑃𝑃𝑃𝑀𝑀𝐶𝐶𝐶𝐶𝑀𝑀𝑃𝑃𝑀𝑀 𝐶𝐶𝑜𝑜 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑦𝑦′𝑠𝑠 𝐻𝐻𝐶𝐶𝐶𝐶𝑠𝑠𝑀𝑀𝐻𝐶𝐶𝐻𝐻𝐻𝐻𝑠𝑠 𝑈𝑈𝑠𝑠𝐶𝐶𝐶𝐶𝑃𝑃 𝐶𝐶𝐻𝑀𝑀 𝑅𝑅𝑀𝑀𝑠𝑠𝐶𝐶𝐶𝐶𝑃𝑃𝑃𝑃𝑀𝑀
=
Mean Per Capita Use
More precise measure of mean consumption rates, constructed from both harvest and use information
Mean per capita use > Mean per capita harvest
Captures differences among household consumption rates related to cultural food patterns
Methods: Cont.
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Assumes that wild foods are …- Equally distributed among and consumed by all residents of households that report
sharing and using the wild food category- Not exported from or imported into a community- Consumed equally across each day of the year, when expressed as grams per day
Limitations …- The results may be lower/higher than actual consumption by individuals- Data is not age-specific- “High-end” consumers underestimated, “low-end” consumers overestimated
What fish should be included in FCR?
Local freshwater and estuarine
Marine species? Generally not included
What about Salmon & Halibut
Marine mammals
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Things to consider: Which Fish
Ray Troll
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Things to Consider: Fish consumption rates represent many values
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EPA 2016
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Things to consider: Regional Differences
Are FCRs significantly different from one part of the state to another?
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Results: FCR Estimates Broken into various percentiles that consider:
Rural Alaska only Region Species Mean (average user) Median (50th percentile of data) 90th-95th (High end consumers)
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Results: FCR Estimates Dataset
110 Communities across Alaska Some regions included more communities than others
Results were reviewed by EPA Considered the methodology Potential statistical errors Reproducibility of results (Would EPA come up with the same answer
using the same data?)
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Improving and Protecting Alaska's Water Quality 17Source: Tradexlive
227 grams = 8 oz = 0.5 lb
ADF&G FCRs
Includes: • Statewide and Regional
Values• Mean and High
Consumer Values• Species
• Freshwater fish• Marine
Invertebrates (e.g., shrimp, mussel, geoducks, etc)
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Statewide values
ADF&G FCRs
Includes: • Statewide and Regional
Values• Mean and High
Consumer Values• Species
• Salmon• Freshwater fish• Halibut & Herring• Marine
Invertebrates (e.g., shrimp, mussel, geoducks, etc)
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Statewide values
Mean FCRs
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Column 1 Column 2 Column 3
MeanRegion
Freshwater & Marine Invertebrates (g/day)
Fresh/Marine Invert/Salmon/Halibut/Herring (g/day) Percent Inc.
Column 1 & 2/Seal & Sea Lion (g/day) Percent Inc.
Rural 66.90 165.70 148% 181.2 9%
SE 38.20 179.50 370% 191.7 7%
SC 26.90 129.60 382% 132.7 2%
SW 61.90 198.70 221% 204.2 3%
W 79.90 209.90 163% 225.8 8%
A 93.00 153.30 65% 191.1 25%
Int 49.90 130.20 161% 130.2 0%
90th Percentile FCRs
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90th
Column 1 Column 2 Column 3
Region
Freshwater & Marine Invertebrates (g/day)
Fresh/Marine Invert/Salmon/Halibut/Herring (g/day) Percent Inc.
Column 1 & 2/Seal & Sea Lion (g/day) Percent Inc.
Rural 160.60 336.10 109% 364.88 9%
SE 94.10 337.50 259% 357.6 6%
SC 69.50 255.30 267% 257.9 1%
SW 118.20 354.90 200% 363.1 2%
W 171.30 424.60 148% 455.3 7%
A 261.20 330.70 27% 376.6 14%
Int 127.70 251.00 97% 251 0%
Interesting points Mean Consumption of freshwater/marine inverts
26 g/d (SC) to 93 g/d (Arctic)
Mean Consumption of fresh/marine/salmon, halibut, herring 130 g/d (SC) to 210 g/d (Western) Percent Increase of 65% (Arctic) to 382% (Southcentral) over
freshwater/marine inverts
Much smaller difference when seal/seal lion consumption is considered
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Now what? DEC is posting the following documents on the DEC Human
Health Criteria webpage.
ADF&G Fish Consumption Rate Analysis (Nov 2018) DEC Human Health Criteria Technical Workgroup Report EPA-contracted statistical analysis of ADF&G Fish Consumption Rate
Analysis (pending final review)
DEC/ADF&G are not accepting public comments on these documents
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Now what cont. DEC will be posting a list of key questions and potential courses of
action related to the development of human health criteria.
Will be asking for feedback on this document
Species to include Target population (Rural, regional, something else?) Which percentile (Mean, 90th, something else?)
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2019 HHC Efforts DEC will be conducting outreach to discuss key questions
and potential courses of action Statewide webinar(s) In-person public meetings Meetings with key stakeholder groups
DEC plans to commence draft rulemaking efforts in Fall 2019 Outreach and public comment will accompany this effort as
well 2020?
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Take away The state recognizes that having an accurate account of Fish
Consumption Rates is important to different stakeholders.
ADEC-Environmental Health conducts fish tissue sampling across the state DHSS testing indicates that most fish have low to no detectable levels of
contamination from pollutants Potential waters of concern are addressed through Fish Advisories.
Alaska has tools available to make water quality criteria more restrictive based on local data on fish consumption.
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Questions?
Thank you!
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