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  • Health Advisory and Guidelines for Eating Fish from Elkhorn Slough (Monterey County)

    July 2016

    Fish, Ecotoxicology, and Water Section Pesticide and Environmental Toxicology Branch Office of Environmental Health Hazard Assessment California Environmental Protection Agency

    OFFICE OF ENVIRONMENTAL HEALTH HAZARD ASSESSMENT

  • Elkhorn Slough Fish Advisory ii

    LIST OF CONTRIBUTORS

    Office of Environmental Health Hazard Assessment (OEHHA)

    Author Shannon R. Murphy, Ph.D. Primary Reviewers Susan A. Klasing, Ph.D., Section Chief Wesley Smith, Ph.D. Huyen Tran Pham, M.P.H. Final Reviewers David Ting, Ph.D., Branch Chief Allan Hirsch, Chief Deputy Director Acting Director Lauren Zeise, Ph.D.

    ACKNOWLEDGMENTS

    Developing fish consumption advisories depends on sampling and analysis of fish. The Office of Environmental Health Hazard Assessment (OEHHA) acknowledges the contribution of information from the following entities: State Water Resources Control Board (SWRCB), as well as the California Department of Fish and Wildlife and its analytical resources, Moss Landing Marine Laboratories and Water Pollution Control Laboratory. Data were obtained from the California Environmental Data Exchange Network (http://www.ceden.us/AdvancedQueryTool). Huyen Tran Pham (OEHHA) created the map using ArcMap (10.3) from Environmental Systems Resource Institute (ESRI, Redlands, California).

    For further information, contact:

    Pesticide and Environmental Toxicology Branch Office of Environmental Health Hazard Assessment California Environmental Protection Agency 1515 Clay Street, 16th Floor Oakland, California 94612 Telephone: (510) 622-3170 Email address: fish@oehha.ca.gov

    1001 I Street, P.O. Box 4010 Sacramento, CA 95812-4010 Telephone: (916) 327-7319

    http://www.ceden.us/AdvancedQueryTool

  • Elkhorn Slough Fish Advisory 1

    LIST OF ACRONYMS AND ABBREVIATIONS

    ATL Advisory Tissue Level

    CDFW California Department of Fish and Wildlife

    CFCP Coastal Fish Contamination Program

    DDT(s) dichlorodiphenyltrichloroethane (DDT) and its metabolites dichlorodiphenyl dichloroethane (DDD) and dichlorodiphenyldichloroethylene (DDE)

    DW Disc Width: distance from wing tip to wing tip (Bat Ray)

    FDA Food and Drug Administration

    Hg mercury

    MDL method detection limit

    mm millimeters

    n sample size

    OEHHA Office of Environmental Health Hazard Assessment

    PCBs polychlorinated biphenyls

    ppb parts per billion

    RL reporting limit

    Se selenium

    SMCA State Marine Conservation Area

    SWAMP Surface Water Ambient Monitoring Program

    TSMP Toxic Substances Monitoring Program

    USDA United States Department of Agriculture

    USDHHS United States Department of Health and Human Services

  • Elkhorn Slough Fish Advisory 2

    US EPA United States Environmental Protection Agency

  • Elkhorn Slough Fish Advisory 3

    PREFACE

    The Office of Environmental Health Hazard Assessment (OEHHA), a department in the California Environmental Protection Agency, is responsible for evaluating potential public health risks from chemical contamination of sport fish. This task includes issuing fish consumption advisories, when appropriate, for the State of California. OEHHA’s authorities to conduct these activities are based on mandates in the:

    • California Health and Safety Code

     Section 59009, to protect public health  Section 59011, to advise local health authorities

    • California Water Code

     Section 13177.5, to issue health advisories

    The health advisories are published in the California Department of Fish and Wildlife Sport Fishing Regulations in the section on public health advisories.

    This report presents guidelines for eating fish from Elkhorn Slough. The report provides background information and a technical description of how the guidelines were developed. The resulting advice is summarized in the illustration after the Table of Contents and List of Figures and Tables.

  • Elkhorn Slough Fish Advisory 4

    TABLE OF CONTENTS

    A GUIDE TO EATING FISH FROM ELKHORN SLOUGH............................................................ 1

    INTRODUCTION .......................................................................................................................... 8

    Location ..................................................................................................................................... 8

    Approach Used .......................................................................................................................... 9

    CHEMICALS OF POTENTIAL CONCERN ................................................................................. 10

    DATA SOURCES ........................................................................................................................ 10

    Coastal Fish Contamination Program (CFCP) ........................................................................ 11

    SWAMP Contaminants in Sport Fish Survey .......................................................................... 11

    Toxic Substances Monitoring Program (TSMP) ...................................................................... 11

    Fish and Shellfish Sampled from Elkhorn Slough ................................................................... 11

    CHEMICAL CONCENTRATIONS ............................................................................................... 13

    Mercury ................................................................................................................................... 14

    PCBs and Pesticides ............................................................................................................... 14

    Selenium ................................................................................................................................. 15

    DEVELOPMENT OF GUIDELINES FOR EATING FISH FROM ELKHORN SLOUGH .............. 17

    General Information ................................................................................................................. 17

    CONSUMPTION ADVICE FOR FISH FROM ELKHORN SLOUGH ........................................... 19

    Asian Clams ............................................................................................................................ 19

    Bat Ray .................................................................................................................................... 19

    Leopard Shark ......................................................................................................................... 20

    Speckled Sanddab .................................................................................................................. 20

    Surfperches ............................................................................................................................. 20

    RECOMMENDED MAXIMUM NUMBER OF SERVINGS........................................................... 21

  • Elkhorn Slough Fish Advisory 5

    REFERENCES ........................................................................................................................... 22

  • Elkhorn Slough Fish Advisory 6

    LIST OF FIGURES AND TABLES

    Figure 1. Location of Elkhorn Slough ............................................................................ 9

    Table 1. Fish Collected from Elkhorn Slough ............................................................... 13

    Table 2. Mercury and PCB Concentrations in Fish from Elkhorn Slough ..................... 16

    Table 3. Recommended Maximum Number of Servings per Week for Fish from Elkhorn Slough .............................................................................................................. 21

    Advisory Tissue Levels for Selected Analytes ............................................................... 25

  • Elkhorn Slough Fish Advisory 7

  • Elkhorn Slough Fish Advisory 8

    INTRODUCTION

    This report presents guidelines for eating fish from Elkhorn Slough (Figure 1) in Monterey County, California, located between Monterey and Santa Cruz.

    LOCATION

    Elkhorn Slough and its surrounding watershed drains into the Pacific Ocean near Monterey Bay and covers over 45,000 acres, making it one of California’s largest coastal wetlands (SWRCB, 2009). The Elkhorn Slough watershed is home to the Elkhorn Slough National Estuarine Research Reserve, a protected region administered by the National Oceanic and Atmospheric Administration and managed by the California Department of Fish and Wildlife, in cooperation with the nonprofit conservancy Elkhorn Slough Foundation1. The main water body known as Elkhorn Slough is located in Monterey County and is characterized by salt marsh, mud flat, freshwater pond, woodland, and grassland areas. The approximately 1,000-acre area surrounding Elkhorn Slough is designated by both the State Marine Reserve and State Conservation Areas. Limited sport fishing is allowed in the Elkhorn Slough State Marine Conservation Area (SMCA). This advisory applies to the Elkhorn Slough SMCA and not the greater watershed region.

    The