A Brief Overview of the Alaska Weathervane Scallop Fishery and the ...
An Overview of Fishery Management Strategies
Transcript of An Overview of Fishery Management Strategies
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An Overview of Fishery Management Strategies
Recreational Red Abalone FMP Project Team
Meeting #3: Discussion of Draft Management Strategies
Tuesday, August 27, 2019
Bill Harford, Laura Rogers-Bennett, Julia Coates, Jono Wilson
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Closed fishery
Open fishery
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Which route should we take?
Let’s talk about three primary constraints…
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Constraint #1: We are in an information-poor situation
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Constraint #1: We are in an information-poor situation
Information-poor foot hold
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• We have many data streams, each is limited in its information content
Constraint #1: We are in an information-poor situation
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• Some indicators are slow to respond in the face change
Constraint #1: We are in an information-poor situation
Ab
alo
ne
con
dit
ion
Time 🡪
True condition
Measured condition
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• Some indicators are imprecise
Constraint #1: We are in an information-poor situation
What we desire:The ball is precisely in left-center field
What we have:The ball is somewhere in the outfield
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• We have a limited understanding of how to verify the mechanistic linkages between environmental conditions and red abalone biology
Constraint #1: We are in an information-poor situation
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• We must use each indicator in a manner that reflects its most pertinent information contribution
Constraint #2: Each indicator informs a somewhat disparate aspect of the biological and ecological condition of red abalone
The original 1 indicator 🡪 multiple indicators
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• We must accommodate site-specific signals where this information is available, while also attempting to guide decision-making at much larger spatial scales
Constraint #3:
Fine-scale spatial structure of red abalone is at odds with feasible scales of data collection.
Marin
Sonoma
Mendocino
Humboldt
Del NorteReef Check site
Not sampled
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Where do we go from here?
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Where do we go from here?
• Data utilized in coarse characterization of defined geographic regions
• Multiple indicators used according to their most salient qualities
• Indicators linked to a HCR that accounts for known limitations
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• The remainder of this talk will summarize two high-level concepts as part of the proposed man. strategy.
• The next talk will dive into the finer details of the proposed man. strategy.
Where do we go from here?
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• Fishing Zones are geographic areas comprising several of the abalone report card sites.
• Why did the modeling begin with a zone-based strategy rather than specific report card sites?
• Simplify and unify decision-making and enforcement within a defined fishing zone
• Requires the least number of changes to existing sampling programs
• Appears tractable with existing sampling intensity
• Intended to maintain a pragmatism in data collection
• Clear strategy for transition from de minimis to open access
Concept #1: Fishing zones
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• Proposal: the north coast is separated into two fishing zones: • Zone 1 consists of Marin and Sonoma counties, • Zone 2 consists of Mendocino, Humboldt and Del Norte
counties.
• The management strategy is applied separately to each zone.
• Under this plan, each zone can have different management status from its neighboring zone at any given time.
Concept #1: Fishing zones
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• Indicator quantities are assigned to color categories
• Indicator quantities are transformed into a set of value judgements about the state of the resource
Concept #2: Traffic light harvest control rule
Red Yellow Green
Management objective: enable open fishery status
Dangerous condition,
far from achievement of
management objective
Unsatisfactory
condition, occurring in
transition from red to
green
Satisfactory condition
aligned with the
management objective
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• Use of traffic light approach found in the scientific literature
• Color category determined by comparing indicator to a reference point
Concept #2: Traffic light harvest control rule
Red Yellow Green
Management objective: enable open fishery status
Dangerous condition,
far from achievement
of management
objective
Unsatisfactory
condition, occurring in
transition from red to
green
Satisfactory condition
aligned with the
management objective
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• Color codes linked to their use in decision trees
• Multiple indicators inform decision-making
• Combination of color coding + decision tree structure enables decision-making according to information limitations
Concept #2: Traffic light harvest control rule
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• Start at the top of tree and follow the pathway (lines) according to the indicator colors.
• Do not jump ahead in following a path through the decision tree.
• It may appear that some pathways are repetitive or redundant, but this is not the case and each decision tree is designed to cover most eventualities.
Concept #2: Traffic light harvest control rule
Indicator A
Indicator B
Additional criteria
Decision tree concept
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Questions?
• Is the concept of the traffic light method clear and easy to follow?
• Please share your thoughts on the idea of fishing zones
• Does the fishing zone idea integrate peer reviewer and project team ideas?