Andrew Applegate NEFMC Staff EBFM PDT Chair EBFM Committee - - PowerPoint PPT Presentation

Andrew Applegate NEFMC Staff EBFM PDT Chair

EBFM Committee September 12, 2017

NOAA Fisheries Definition EBFM Strategic Policy

 A systematic approach  In a geographically specified area  That ensures resilience and sustainability of the

ecosystem

 Recognizes the physical, biological, economic, and social

interactions

 Among the affected components of the ecosystem,

including humans

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EBFM Steps

• 1. Specify spatial management units
• 2. Define stock complexes
• 3. Establish specific management objectives

and exploitation reference points.

• 4. Establish biomass thresholds (floors)
• 5. Devise an ecosystem-based harvest control

rule

• 6. Simulate the performance of EBMP
• 7. Identify and reconcile tradeoffs.

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EPU identification

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Scope – area to be included Georges Bank EPU?

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EBFM Framework

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Productivity

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Scope – species/stocks Georges Bank EPU

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Functional groups

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NEFMC Managed Species

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Recent Fishing Mortality

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Status Quo Target Exploitation

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Georges Bank Landings

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Georges Bank catch (mt) by Feeding guild: Commercial landings and discards, herring landings, Recreational (A+B1)

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Georges Bank catch (mt) proportion by Feeding guild:

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Western Gulf of Maine catch (mt) by Feeding guild: Commercial landings and discards, herring landings, Recreational (A+B1)

T esting management procedures

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Draft Operational Framework

 Operating (ecosystem simulation) models

 Hydra – 10 species length-structured model with trophic interactions  Ecosym/Ecopath (EwE) – mass-balance energy flow  Atlantis – end-to-end with physical and biological processes

 Operational Framework

 Operating models used to evaluate management strategies

 Require goals and objectives to evaluate effectiveness

 Management Strategy Evaluation process  Assessments to provide tactical advice  Functional groups and EPU catch cap  Ecosystem overfishing definition  Overfished/depleted definitions for individual species

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Harvest Control Rules

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Worked examples

• f potential HCRs

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• 1. Threshold exploitation (no ramp down) at Ex=0.15, 0.2, 0.25, 0.3 and

Floor=0.2 of unfished biomass applied at the species complex level

• 2. Threshold exploitation (no ramp down) at Ex= 0.15, 0.2, 0.25, 0.3 and

Floor=0.2 of unfished biomass applied at the individual species level

• 3. Threshold exploitation (no ramp down) at Ex= 0.15, 0.2, 0.25, 0.3 and

Floor=0.2 of unfished biomass for each species except winter skate and dogfish (Floor=0.3 of unfished biomass) applied at the individual species level

• 4. Ramp-down exploitation using 'steps' at Ex=0.15, 0.2, 0.25, 0.3 and

Starting at B/Bo = 0.4 applied at the species complex level

• 5. Ramp-down exploitation using 'steps' at Ex=0.15, 0.2, 0.25, 0.3 and

Starting at B/Bo = 0.4 applied at the individual species level

• 6. Ramp-down exploitation using 'steps' at Ex=0.15, 0.2, 0.25, 0.3 and

Starting at B/Bo = 0.5 applied at the individual species level for winter skate and dogfish

Worked examples

• f potential HCRs

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• 1. Threshold exploitation (no ramp down) at Ex=0.15, 0.2, 0.25, 0.3 and

Floor=0.2 of unfished biomass applied at the species complex level

• 2. Threshold exploitation (no ramp down) at Ex= 0.15, 0.2, 0.25, 0.3 and

Floor=0.2 of unfished biomass applied at the individual species level

• 3. Threshold exploitation (no ramp down) at Ex= 0.15, 0.2, 0.25, 0.3 and

Floor=0.2 of unfished biomass for each species except winter skate and dogfish (Floor=0.3 of unfished biomass) applied at the individual species level

• 4. Ramp-down exploitation using 'steps' at Ex=0.15, 0.2, 0.25, 0.3 and

Starting at B/Bo = 0.4 applied at the species complex level

• 5. Ramp-down exploitation using 'steps' at Ex=0.15, 0.2, 0.25, 0.3 and

Starting at B/Bo = 0.4 applied at the individual species level

• 6. Ramp-down exploitation using 'steps' at Ex=0.15, 0.2, 0.25, 0.3 and

Starting at B/Bo = 0.5 applied at the individual species level for winter skate and dogfish

Scenario 1 Fixed exploitation

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 Catch, biomass, and proportion overfished  Fixed exploitation for all biomass levels

Scenario 1 Fixed exploitation

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Scenario 4 Ramp applied to depleted guild

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 Exploitation reduced for guilds  Threshold: Guild biomass < 40% of unexploited state  Floor, no landings: Guild biomass < 20% of

unexploited state

Scenario 4 Ramp applied to depleted guild

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Scenario 5 Ramp applied to depleted species

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 Exploitation reduced for species  Threshold: Species biomass < 40% of unexploited

state

 Floor, no landings: Species biomass < 20% of

unexploited state

Scenario 5 Ramp applied to depleted species

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Catch biomass comparisons

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Catch biomass comparisons

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Application to managed species

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 Species complex exploitation from simulation and

tradeoff analyses

 Actual biomass determined from expanded survey

data or multispecies assessment results

 Apply exploitation rate to above; group target catches

by stock complex

 Aggregate amount is the ecosystem catch cap

Identifying Depleted Species

Smooth research vessel survey estimates using Kalman filter Species classified as depleted when below 20% percentile

Other broad scale models Production Potential

Bacteria Microplankton Upper Trophic Levels Nanoflagellates Nano-Picoplankton Microzooplankton Mesozooplankton Planktivores Benthivores Suspension-Feeding Benthos Deposit-Feeding Benthos

Back to the Real World: Fishery Production Potential by Functional Group

Exploitation Rate= 0.2 for each functional group Production Potential includes all size classes and species within functional Groups

Median Production Potential for Bivalves ~ 20kt (Live Weight) Median Production Potential all others ~ 220kt (Live Weight) [~160kt for currently Exploited species]

Performance metrics Punt et al. 2016

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Performance metrics

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Questions Science, models, and operational framework

 Is the operational framework and document clear?  What critical elements are missing?

 Is the approach of establishing an EPU catch cap and

allocations amongst functional groups of species an acceptable approach?

 What do you want the EBFM PDT to do next?

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Questions Science, models, and operational framework

 Are the data and models sufficient to test and

validate real world management approaches that could be implemented as regulations?

 What type of development or parameterization

(tesing, peer review, etc) needed before developing a Management Strategy Evaluation (MSE) and engaging fishermen and the public?

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