ESTIMATION OF SIZE-SELECTIVITY AND MOVEMENT RATES FROM MARK RECOVERY DATA

Size selectivity, movement rates among spatial strata, and size-depend ent mortality rates were estimated from mark-recovery data of Pacific halibut (Hippoglossus stenolepis). Growth rates, area- and time-specif ic fishing mortality on fully vulnerable individuals, and tag return r ates were assumed known from other data. We obtained similar estimates from a model that considered movement to take place immediately after tagging and a model that assumed that movement takes place once each year. The inability to distinguish between one-time and annual movemen t is most likely due to the fact that tagged juveniles were not recove red until 3-5 yr later when they became vulnerable to the adult fisher y.