Fishing Mortality (F) time series may not appear as Yield or F in output plots

[joeb]

When F time series data is loaded for a group that has no fishing effort, which is possible, the Catch and F in the !Ecosim results object will not contain Catch or F for this group. See cEcosimModel.PopulateResults(). The F time series data will be used by the model to calculate total loss it is just the code in PopulateResults() that calculates Catch and F that filters on Landings and Discards that will skip this group.

[jeroens]

1) Add validation on F time series: invalidate time series if applied to a group that is not fished. Time series have a way to be flagged as invalid; should be done in the core.