A Survey of Cadmium in Pacific Oysters: Distribution, Influencing Factors and Ways to Minimize Concentrations Aimee Christy Pacific Shellfish Institute.

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Presentation transcript:

A Survey of Cadmium in Pacific Oysters: Distribution, Influencing Factors and Ways to Minimize Concentrations Aimee Christy Pacific Shellfish Institute Olympia, WA

Problem Identification Hong Kong rejects shipment of BC oysters > 2 ppm ML import standard Hong Kong rejects shipment of Hood Canal, WA oysters Codex Alimentarius deliberates a 1-ppm ML for molluscan shellfish ECONOMIC & HUMAN HEALTH CONCERNS

Partners/Funding Source

Research Goals 1.Evaluate Cd distribution in west coast Pacific oysters 2.Evaluate impact to shellfish industry and human health 3.Identify factors that influence oyster Cd concentration & find ways to reduce concentrations in final product

What is Cd and why is it a human health concern? Naturally occurring trace element Concentrations higher from Pacific NW to AK Long biological half-life (10-30 yrs) Accumulates in soft tissues, esp. liver and kidneys Can cause kidney dysfunction, liver disease and skeletal decalcification at high enough concentrations = 10 μg/day

Cadmium in Pacific oysters Filter feeders Detoxification system –MT proteins = 50 μg per 40 gram oyster Health Canada recommends a PTWI of 420 μg Cd from all sources for 60 kg person

What is the spatial distribution of Cd in Pacific oysters? Graphics by Integral Consulting

Ave: 1.25 ±.51 ppm Range: ppm 13.5% > 2 ppm ML 61% > 1 ppm ML Average Cd in Oysters per Region

Seasonal Sampling Oyster TissueSeawater Total Cd/Zn Dissolved Cd/Zn Seston TSS Plankton counts and speciation Sediments Cd/Zn TOC Grain Size Temperature Salinity pH Dissolved oxygen

Unpopular Tip #1 Grow / harvest at locations known to have oysters with lower Cd concentrations What are the factors that influence Cd concentrations from region to region? vs South Puget Sound Hood Canal

Sites with Fastest Growth Rates BIODILUTION

Sites with Slowest Growth Rates BIOACCUMULATION

Factors that Influence Cd Uptake Rate A decrease in salinity from 30 ppt to 20 ppt increased Cd uptake in 4 species of marine bivalves by as much as %. (Jackim et al. 1977) WDOE Marine Water Monitoring Data

Somewhat Unpopular Tip #2 Harvest oysters in the summer and avoid fall Weight increases with feeding and gamete production Weight decreases with spawning and/or utilization of glycogen stores

After measuring influx rates and Cd accumulation in Pacific oysters from radiolabeled plankton, sediment and seawater, Dr. Wen-Xiong Wang reported…. “Most of the cadmium in the oysters was due to uptake from seawater in the dissolved phase.” Ian Stupakoff & Dr. Wen-Xiong Wang

Potentially Popular Tip #3 Consider processing your oysters: 1.Traditional shucking, washing, jar packing + 10 days cold storage 2.High pressure processing + 10 days cold storage Research conducted by R. Rasmussen (OSU Seafood Labs)

Bonus Tip #4 Consider growing / harvesting Olympia oysters or a different shellfish species altogether

Conclusions Regional differences in oyster Cd concentrations were detected Factors were identified that have a significant impact on Cd concentrations: –Growth rates, Cd in dissolved seawater, physical parameters and seasonality Activities to reduce Cd residues in final products may include site selection, harvesting in the summer and/or processing

Contact Information Aimee Christy Pacific Shellfish Institute