WikiPrint - from Polar Technologies

Management Strategy Evaluation = User notes (alpha ver. 6.3)

Options

MSE Options form.

Control Options:

The MSE module can be used to evaluate a set of regulatory rules i.e. Target fishing mortality, Fixed F, Escapement or TAC via input (fishing effort) or output (quota, fishing mortality) controls or evaluate the currently loaded Ecosim scenario.

Previous documentation

Management Strategy Evaluator = User notes (alpha ver. 6.0.7.0317)

How to run the MSE

Set Quotas

The MSE is capable of setting quotas by two methods.

  1. Target fishing mortality rates. Target fishing mortalities are set via the Input regulatory > Target fishing mortality dialogue then setting biomass limit, biomass base and F max. values for individual groups.
  2. Fixed escapement. Fixed escapement values are set via the Input regulatory > Fixed escapement dialogue.

If fixed escapement is provided then the yearly quotas will be calculated as the biomass greater than the fixed escapement. Otherwise quotas will be calculated from the target fishing mortality rates.

Set regulatory option

Implemented of the quota is set via the Input regulatory > Regulatory options dialogue. Four options are provided

  1. Not Used. No quota regulation will be imposed on this fleet.
  2. Weakest stock + discards quota. If catch on any group exceeds its quota then effort will be limited at that level.
  3. Strongest stock. If catch of the group with the maximum effort exceeds its quota then effort will be limited. Catch in excess of the quota is discarded and will have a discard mortality set via Input data > Fishery > Discard mortality rate.
  4. Selective fishing quota. If catch of the group with the maximum effort exceeds its quota then effort is limited. Catch in excess of quota will not be included in the fishing mortality and will be assumed to have a 100% discard survival rate.

Run the MSE

The MSE is capable of running in three different modes.

  1. Ecosim effort use regulatory options. Uses fishing effort from the currently loaded Ecosim scenario then regulates effort according to the regulatory options selected. This option will only reduce the effort if catches exceed the quota. You may need to increase the Ecosim effort to see any effect of this option. Also if catches go to zero this option will keep effort at the Ecosim input levels. It will never reduce the effort because there was no catch.
  2. Predict effort use regulatory options. Fishing effort will be predicted based on the parameters set in the Fleet size dynamics form then fishing effort will be regulated according to the regulatory options selected.
  3. Evaluating the currently load Ecosim scenario. No attempt is made to regulate the fishery this mode is used to evaluate the current Ecosim scenario.

Setting of Target Fishing Mortalities

Target Fishing Mortality parameters are set to default values the first time a model is loaded. Biomass limit = 10% of Ecopath biomass, Biomass base = 40% of Ecopath biomass and F. max = fishing mortality rates calculated from the Ecopath inputs. The MSY(Maximum Sustainable Yield) search can be used to compute values for the Target Fishing Mortality parameters. When the MSY is run it will overwrite the current parameters of the Target Fishing Mortality. The MSY search is accessible via the Input reference level > MSY dialogue.

Inputs

Outputs

FAQ