SSgrowth

Models and notes for a half-day session on teaching modeling growth in Stock Synthesis

Not yet sure how GitHub will work for this use.

Modeling growth in stock assessments using the Stock Synthesis modeling framework

A half-day session held on Monday (November 3rd) afternoon by Ian Taylor

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=========== Outline (not guaranteed to be accurate)

• Parameterization of growth curves
  • Overview of how many growth parameters are estimated in typical assessments
  • Specification of von Bertalanffy growth curve in SS
  • Specification of length variability around the mean growth curve
  • Treatment of male growth as offsets from female growth
  • Growth between birth and first reference age
  • Calculation of length in plus group
• Quantities that depend on growth and how they are connected
  • Growth curve,
  • Length-at-age matrix,
  • Length compositions,
  • Mean length- or weight-at-age
  • Conditional age-at-length compositions
• Overview of example models
  • Length comps and conditional age-at-length comps (yelloweye-like model from simulation analysis for paper on growth platoons -- but without growth platoons)
  • Mean weight-at-age with no growth (simplified hake assessment)
  • Age comps and mean length-at-age observations (simplified mackerel from Paul)
• Timing issues
  • Start of year vs. mid-year growth, fleet timing
  • Seasonal models and birth seasons
    • This is going to change in SS version 3.3, perhaps some preview can be provided
• Advanced topics
  • Time-varying growth
    • Annual deviations
    • cohort-specific deviations
  • Alternative growth curves
    • Richards (or is it Schnute?)
    • age-dependent K
  • Growth platoons and growth morphs
  • Seasonal and spatial?
• Whatever you want to talk about