Harvest actions

This document provides additional information about how harvest actions are implemented in the fall run model for Reorienting to Recovery (R2R). For more more information about the model itself, including the codebase, please see our documentation.

Harvest actions

There are 9 harvest actions that can be implemented in the model. Each has an associated number that is used to build a scenario in the R2Rscenarios package.

  • 10: Baseline harvest
  • 11: Tribal harvest only
  • 12: In river harvest only
  • 13: Ocean harvest only
  • 14: Intelligent CRR harvest
  • 15: Intelligent habitat harvest
  • 16: Harvest only hatchery fish (ocean)
  • 17: Harvest only hatchery fish (tributary)
  • 25: No harvest of dry year cohort

10: Baseline harvest

If 10 is selected, baseline harvest logic is used which applies in-river and ocean harvest according to rates detailed in the 2022 Preseason Report PFMC.

11: Tribal harvest only

The model allows for a binary variable as an argument that states whether or not tribal harvest is to be preserved. If 11 is selected, this argument is set to TRUE and for all tributaries, 1% of in-river, natural fish harvest is taken. (Note: this value is a working number and will be updated iteratively based on conversations.)

12: In-river harvest only

If 12 is selected, there is no ocean harvest applied at any point in the model, and in-river harvest remains at baseline numbers (see 10).

13: Ocean harvest only

If 13 is selected, there is no in-river harvest applied at any point in the model, and ocean harvest remains at baseline numbers (see 10).

14: Intelligent CRR harvest

The model allows for a binary variable as an argument that states whether or not to implement the intelligent cohort replacement rate (CRR) harvest strategy. If 14 is selected, this argument is set to TRUE and the model will implement harvest logic that harvests adults only up to the number of spawners required to maintain a CRR of either 1 (default) or another scalar (user specified).

15: Intelligent habitat harvest

The model allows for a binary variable as an argument that states whether or not to implement the intelligent habitat harvest strategy. If 15 is selected, this argument is set to TRUE and the model will implement harvest logic that preserves the number of spawners that fill all available spawning habitat, and allows for harvest of all spawners above that population size.

16: Harvest only hatchery fish (ocean)

If 16 is selected, the model will allow commercial (ocean) harvest of hatchery fish but not natural fish.

17: Harvest only hatchery fish (tributary)

If 17 is selected, the model will allow in-river harvest of hatchery fish but not natural fish.

25: No harvest of dry year cohorts

If 25 is selected, the model will prevent in-river and ocean harvest of “dry year cohorts”, or fish produced during the model dry years (1982, 1986, 1988-1993, and 1995). Harvest can still occur in all years, but not of those fish.