Harvests of legal sized fish are computed as follows:

MDLCohortCat(s,a,f) = Run(s,a)HR(s,a,f)FP(s,f)PV(a,f) [4.18]

where

• MDLCohortCat(s,a,f) = preterminal or terminal catch of stock s, age a, in fishery f
• Run(s,a) = coastwide ocean abundance, OcnRun(s,a), or coastwide terminal run, TermRun(s,a), for stock s, age a
• HR(s,a,f) = harvest rate for stock s, age a, in fishery f
• FP(s,f) = fishery policy scalar for stock s in fishery f
• PV(a,f) = proportion vulnerable for age a in fishery f (i.e., proportion of age a fish that are recruited to the gear and are above the legal size limit in fishery f).

Note that the PVs are age and fishery specific, but not stock specific. The FPs are fishery policy scalars and are unique to each stock, fishery, and year. They are used to simulate the effects of changes in fishery policies that disproportionately impact different stocks relative to the base period (e.g., changing the timing of the fishing period may impact stocks differently). For example, a value of FP(2,3) = 0.5 indicates that the harvest rates for all ages of stock 2 in fishery 3 are 50% of the corresponding base period harvest rates. Other stocks harvested by fishery 3 may be impacted differently.