Patterns in mercury and trace organic contamination of sport fish and sediments in San Francisco Bay compared to the offshore coast
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1 Patterns in mercury and trace organic contamination of sport fish and sediments in San Francisco Bay compared to the offshore coast RMP Technical Review Committee July 9 th, 2009 Aroon Melwani, Ben Greenfield, Laura Targgart, and Mike Kellogg
2 Outline Background Goals of the study and RMP Management Questions Data/Methods Results Mercury and PCB concentrations Comparison to human health (HH) thresholds Interannual trends Implications for RMP and SWAMP
3 Background RMP monitoring in the Bay for contaminants in fish (since 1994) and sediments (since 1993) CCSF monitoring for permitting began in 1982 Fish/crab bioaccumulation Sediment chemistry Benthic macrofauna Integration of these datasets had yet to be performed Differences: anthropogenic influence, sources, pathways for particles and contaminants Movement range of fish expected to be higher on the coast
4 RMP Management Questions Level I 1. Are chemical concentrations in the Estuary potentially at levels of concern and are associated impacts likely? 4. Have the concentrations, masses, and associated impacts of contaminants in the Estuary increased or decreased?
5 Datasets City and County of San Francisco (CCSF) Two stations (Hg), (Orgs) English sole (sub-adults < 200 mm length) Composites (10 fish) Mercury, PCBs, PAHs, pesticides Sediments (surface) Regional Monitoring Program (RMP) Five stations White croaker, shiner surfperch, striped bass Composites (5-20 fish)/individuals Mercury, PCBs, pesticides, PAHs (seds only) Sediments (surface)
6 Datasets Coastal Fish Contamination Program (CFCP) Four stations ( ) Surf perches, white croaker, striped bass Composites (3 15 fish) Mercury, PCBs, pesticides Value Added: human health assessment, sport fish along the coast, contaminants of concern
7 Coast Bay
8 Data Analysis Fish and sediment median concentrations Sum organic contaminants per RMP methods Status: 1999 to 2006, maximized comparability HH thresholds from Klasing and Brodberg (2008) 2 servings/week advisory tissue level used in this presentation General linear model used to evaluate trends Used widest range in years possible
9 Mercury Region Species Average Length (cm) Sample size (% below detection) Mercury Median ± Std Dev San Francisco Bay Shiner surfperch (0%) 0.08 ± 0.04 Striped bass (0%) 0.30 ± 0.15 White croaker (0%) 0.21 ± 0.07 Black surfperch 26 9 (0%) 0.13 ± 0.04 Walleye Surfperch 28 4 (0%) 0.16 ± 0.04 Starry Flounder 29 2 (0%) 0.05 ± 0.03 Offshore Coast Striped bass 58 1 (0%) 0.42 Silver perch 17 3 (0 %) 0.08 ± 0.06 White croaker 25 3 (0 %) 0.15 ± 0.02 Walleye surfperch 20 3 (33 %) 0.09 ± 0.09 English sole (0%) 0.02 ± 0.01 Coastal Piers Rainbow surfperch 24 2 (0 %) 0.07 ± 0.00 White surfperch 19 3 (0 %) 0.06 ± 0.01 wet weight
10 Mercury Comparison to HH Thresholds Species with Hg > 0.15ppm (2 meals) RMP: Shiner perch 3/32 RMP: Walleye 2/9 RMP: White croaker 23/26 RMP: Striped bass 73/74 CFCP: Silver perch 1/3 CFCP: Walleye 1/3 CFCP: White croaker - 1/3 CFCP: Striped bass 1/1
11 Mercury Trends English Sole (Coast) Median MDL Sport fish TMDL Target in the Bay 0.2 ug/g Mercury (ug/g, ww) Year
12 PCBs Region Species Average Lipid (%) Sample size (% below detection) PCBs Median ± Std Dev San Francisco Shiner surfperch (0%) 121 ± 77 Bay Striped bass (0%) 47 ± 16 White croaker (0%) 222 ± 96 Black surfperch (0%) 8 ± 4 Walleye Surfperch (0%) 41 ± 50 Starry Flounder (0%) 11 ± 9 Offshore Coast Striped bass (0 %) 34 ± 35 Silver perch (0 %) 54 ± 16 White croaker (0 %) 2.8 ± 1.0 Walleye surfperch (0 %) 29 ± 2.8 English sole N/A 35 (80%) 0 ± 2.1 Coastal Piers Rainbow surfperch (0%) 3.4 ± 1.2 White surfperch (0 %) 4.8 ± 2.0 wet weight
13 PCB Comparison to HH Thresholds Species with PCBs > 42 ppb (2 meals) RMP: Shiner perch 45/47 RMP: White croaker 44/44 RMP: Walleye 2/4 RMP: Striped bass 9/17 CFCP: Silver perch 2/3 CFCP: White croaker 1/3 CFCP: Walleye: 0/3 CFCP: Striped bass 1/3
14 PCB Trends English sole (Coast) Shiner surfperch (Bay) Median MDL (Bay/Coast) Total PCBs (ng/g, ww) Year Sport fish TMDL Target in the Bay 10 ng/g
15 Sediments Central San Francisco Bay Contaminant (units) Median Concentration (St. Dev) Sample size (% Below Detection) Mercury (ppb) (88.6) 77 (0%) Napthalene (ppb) (18.1) 75 (0%) p,p-dde (ppb) 0.60 (0.6) 67 (19%) PCB110 (ppb) 0.33 (0.6) 59 (22%) PCB095 (ppb) 0.12 (0.5) 59 (22%) Fine Grains (%) (23.6) 77 (0%) Organic Carbon (%) 1.06 (0.5) 77 (0%) Phenanthrene (ppb) (206.9) 77 (1%) Pyrene (ppb) (440.7) 77 (0%) Offshore Coastal Contaminant (units) Median Concentration (St. Dev) Sample size (% Below Detection) Mercury (ppb) (69.4) 20 (35%) Napthalene (ppb) 0 (7.8) 18 (56%) p,p-dde (ppb) 0 (0.6) 18 (94%) PCB110 (ppb) 0 19 (100%) PCB095 (ppb) 0 19 (100%) Fine Grains (%) 4.50 (3.2) 20 (0%) Organic Carbon (%) 0.13 (0.04) 20 (0%) Phenanthrene (ppb) 2.48 (15.6) 18 (39%) Pyrene (ppb) 3.50 (34.1) 18 (28%)
16 Mercury in Sediment (ug/g) R 2 = Coast Central SFB Linear (Coast) Linear (Central SFB) 0.10 R 2 = Percent Fines (%)
17 Summary PCBs in sport fish and Hg in sediments from San Francisco Bay were relatively high compared to the coast PCBs and mercury in sport fish on the coast appear to still be at levels for concern to human health CCSF data not useful for HH evaluation but good for trends Higher sample sizes required on the coast, need lipids data
18 Summary Long-term trends not evident, despite different species being evaluated Sampling that is currently underway on the coast through SWAMP will help to provide the necessary sample sizes to evaluate the patterns observed in this study * Report will be distributed to TRC by July 17 th ** CCSF data will be available via RMP Web Query Tool in October
19 Questions??
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