Alternative catch histories for Blue whiting

Visualisation using dynamic plots

Looking at individual trajectories is a good way to communicate volatility over time. Below are dynamic graphs for five alternative histories but under different HCRs. The stochasticity comes mostly from modelling assessment error. Recruitment, for each simulated alternative history, follows the same historical trend, taken from the 2018 stock assessment.

Alternative catch histories for Blue whiting

Laurie Kell and Polina Levontin

09/08/2019

Visualisation using dynamic plots

HCR 1 without bounds (single tier HCR without stability mechanism).

HCR 1 with bounds (single tier HCR with stability mechanism).

It is possible to compare alternative histories with actual catches - black line - now added to the graphs.

HCR 2 without bounds (two-tier HCR without stability mechanism).

HCR 2 with bounds (two-tier HCR with stability mechanism).