Operating Model Concepts

This part describes how the operating model works: the key concepts, objects, and workflows that sit between the worked examples in Getting Started and the full mathematical specification in Technical Details.

Chapter 16 describes the common structure used to specify biological and fleet schedules, including the two ways to populate a schedule, the accepted input formats for parameters, and how to supply custom model functions.

Chapter 17 describes the Populate() function, which expands the compact parameter inputs in an OM object into the full arrays used in the simulation.

Chapter 18 describes how Simulate() reconstructs historical dynamics and how Project() runs the forward projections for the closed-loop simulation testing of the candidate management procedures.

Chapter 19 explains the concept of stock complexes: the grouping of stocks that share a single observation model and management action, and when and why a complex differs from a single stock.

Chapter 20 describes the Spatial subcomponent of a Stock object, covering how to specify movement between areas, from simple two-area models through to multi-area models with age-varying movement, and how fishing effort is allocated spatially.

Chapter 21 explains the reference points computed from the operating model, including unfished and MSY-based quantities, how to access them, and additional considerations for seasonal and spatial models.