6.5. Questions and Tasks
121
can make about the relations between age-specific rates of movement
and population dynamics?
6. a) Disaggregate the fishing fleet into three cohorts-e.g. small, medium
and large boats-each having a different cost per unit effort (j), a different catchability coefficient (V) and a different ability to adjust effort
to changes in profits (ALPHA).
b) Given your assumptions in part a), will a reserve change the relative
abundance of different-sized boats in the fishery?
7. Expand and refine the model user interface of Section 6.4 so that the
model can be easily understood and operated without having to read
Chapter 6.