• Celtic Sea Sprat
• NEA Mackerel

Targets:

Achieve some central tendency, or fluctuate around without trend, e.g.

• \(F_{MSY}\)
• \(B_{MSY}\)

Limits:

Avoid with high probability e.g.

• \(B_{lim}\)
• \(F_{lim}\)

You do not want to drop below a critical biomass level

• E.g. which would take you half a generation time to recover from

• Can be estimated for any

  • stock
  • assessment method with an explicit or implicit production fucntion

Social and Economic

• \(MSY\) maximum sustainable yield
• \(MEY\) maximum economic yield
• \(MSNY\) maximum sustainable nutrient yield
• \(IAAV\) Variability in yield

Ecosystem

• MFSD
  • Descriptor 3 Criteria 3 of GES ‘age and size distribution that is indicative of a healthy stock’
  • \(ABI_{MSY}\) age-based indicator to monitor age structure relative to the equilibrium age structure at \(F_{MSY}\) (Griffiths et al. 2023)
• Predator needs
• Community structure
• Spatial

• Safety
• State
• Yield
• Variability
• Predator need
• Human need

• Seasonal Operating Model
• HCR based on in-year acoustic survey
• Relative Harvest Rate
• Objectives represented by Summary Statistics
  • Status
  • Safety
  • Yield
  • Predator Needs

Fod Web

Skill Score for screening indicators and reference levels

LBI, Abundance, or Catch/Abundance

Empirical MP with best indicators, e.g. set catches using a relative harvest rate

Objectives: \(B_{lim}\)

Objectives: Forage

Maximum Sustainable Nutrient Yield

Maximum Sustainable Nutrient Yield

Maximum Sustainable Nutrient Yield

Maximum Sustainable Nutrient Yield