Regional Impact Assessment of Derelict Fishing Gear in the ... · Regional Impact Assessment of...

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Regional Impact Assessment of Derelict Fishing Gear in the Chesapeake Bay Amy V. Uhrin Chief Scientist NOAA Marine Debris Program Briefing for: Chesapeake Bay Program Sustainable Fisheries GIT Executive Committee May 23, 2016 marinedebris.noaa.gov

Transcript of Regional Impact Assessment of Derelict Fishing Gear in the ... · Regional Impact Assessment of...

Page 1: Regional Impact Assessment of Derelict Fishing Gear in the ... · Regional Impact Assessment of Derelict Fishing Gear in the Chesapeake Bay Amy V. Uhrin Chief Scientist NOAA Marine

Regional ImpactAssessmentofDerelictFishingGearintheChesapeakeBay

AmyV.UhrinChiefScientist

NOAAMarineDebrisProgram

Briefingfor:ChesapeakeBayProgram

SustainableFisheriesGITExecutiveCommittee

May23,2016

marinedebris.noaa.gov

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Goal

Developacomprehensive,regionalimpactassessmentaimedatestimatingthecumulativeimpactsofderelictcrabpotsonnaturalresourcesinChesapeakeBay

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1) Identify/evaluatefactorscontributingtodistributionanddensitiesofderelictbluecrabtraps

2) InventoryavailabledatawithregardtoObj.1

3) Identifyandfilldatagaps

4) DevelopaspatialmodeltoevaluateObj.1factors

5) Quantifyecological/economicimpactsofDFG

6) DevelopaDFGframeworkforuseinotherfisheries

Objectives

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GeographicWeightedRegression

Responsevariable=derelictfishinggeardensity*

Predictorvariables=fishingeffort†,depth**,vessels††,location***

*MD:systematic,sidescansonarsurveys(2007);watermencleanups(2010,2012)VA:fishermenfieldsurveys/removals(2008‐2012);tributary‐specificsurveys(2005‐2011,2015)

†MD:activetrapsfieldsurveys(2007‐2012);MDDNRreports(1994‐2014);interviews(2014‐2016)VA:activetrapsfieldsurvey(2010);VMRCreports(1994‐2014)

**1995NOAAHydrographicSurveydata

††expertknowledge,AutomaticIdentificationSystemdata

***NOAAfishinglocationcodes

Objective4– spatialmodel

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Objective4– spatialmodel

Baltimore

PredictionGridFieldData

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Objective4– spatialmodelPredictionGrid PredictedHotspots

Derelict Crab Pot Density (km2)High : 185.767

Low : 0.587677

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Objective4– spatialmodel

Tributary‐specificwork(10)

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Objective5– ecologicalimpacts

Mortality• Bluecrab

Bycatchmortality• Terrapin• Whiteperch• Croaker• Blackseabass• Spot• Reddrum

Habitat• SAV,oysterbeds

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Objective5– economicimpacts

• Estimatesannualharvestsasafunctionofeffort(numberofpots),stock,andderelictgearremovals

• Predictsharvestswithandwithoutderelictgearremovals

• Comparesmodelpredictionstoevaluateeffectofremovalsoncommercialharvests

Spatially‐explicitharvestmodel*

*Scheld etal.2016.Thedilemmaofderelictgear.ScientificReports6:19671

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Objective5– economicimpacts

#TrapsRemoved

Avg Poundsof

IncreasedHarvest

Avg IncreasedRevenue

Virginia* 34,397 30million(27%)

$21.2million

Maryland 9,560 8million(16%)

$10.9million

*Scheld etal.2016.Thedilemmaofderelictgear.ScientificReports6:19671

Spatially‐explicitharvestmodel

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Bay‐wide

Objective5– economicimpacts

Spatially‐explicitharvestmodel

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Objective5– economicimpacts

Spatially‐explicitharvestmodel

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Objective6– guidingframeworkDFGManagement

Fishery Impacts of DFGs

Cost of lost gear

Habitat & Resource Impacts

Model DFG Reduction Impact 

Scenarios

MD Chesapeake Estimates

VA Chesapeake Estimates

Chesapeake Bay‐wide Estimates

Identify Core DFG Metrics 

& Data Gaps

Recommend Assessment 

Methods / Metrics

Chesapeake Bay Case Study

EcologicalImpacts

Economic Impacts

Crab Pot Density Distributions

Blue Crab CPUE Distributions 

Spawning Female Density

Identify Spatial  Patterns

VMRC | MD DNRBAY‐WIDE

VIMS economic model

DFG Removal Distributions

Blue Crab Impacts

Identify, map & rank

Identify, map & rank

White Perch Impacts

Identify, map & rank

Turtle Nesting Impacts

Identify, map & rank

Benthic Spp. Impacts

Mapping&ModelingBathymetry, Depth, Seagrass, Sediments

Blue Crab VMRC | MD DNR

White PerchVMRC | MD DNR

Terrapin Turtles Distributions / nesting 

beaches (VMRC)

Fishing EffortVMRC | MD DNRFishery Effort

VMRC | MD DNR

Within Bay Regional Variance Matrix

Weighted Spatial Data 

Matrix

DFGVMRC | MD DNR

Fishery Resource  Population estimates(Landings & Bycatch)VMRC | MD DNR

Salinity, H2O QualitySpring‐Winter Flows

EnvironmentalCovariates

Benthic SpeciesSpot, Croaker, Drum Oyster, Mussels

VMRC | MD DNR