3.4 Lesson Name: Status Quo Escapement Analysis

The default long-term management strategy is to make some catch reductions during 1995-1997 and then beyond 1998 keep catches and harvest rates at about the average 1991-1994 level. How will this strategy impact spawning escapements? (The term "escapement" refers to the fish that "escape" all fisheries and return to the spawning grounds.)

Analysis Approach:

Run the model under the default long-term management strategy and record the escapement trends for each stock.

How To Do It:

1. Create a table with three columns for recording the data. Column one is for the stock name, column two is for the trend (increasing, decreasing, stable), and column three is for the approximate value in year 2017.
2. Launch and run the model.
3. Click the Stock Menu.
4. Click Stock Graphs.
5. Click Escapements.
6. Resize the resulting Total Escapement Graph so it fits in the upper right portion of the screen and lets you see the map icons.
7. Click the "wand" button at the top of the graph.
8. Move the mouse pointer over a stock icon (fish icon) to show the escapement trend for that stock (the stock name will be at the top of the graph window).
9. Record the trend of the escapement during the simulation period.
10. Move the mouse pointer onto the graph window (be careful not to move the pointer over another fishery icon or it will change the graph) and determine the approximate escapement in year 2017. Record the escapement in the table.
11. Repeat steps 9-11 until data for all stocks has been recorded.

1. How many stocks have increasing, decreasing, or stable escapement trends?
2. What factors not in the model might affect escapement trends?