YPR and its contemporary counterpart investigate only equilibrium
conditions when in fact fisheries are very dynamic. Evaluating
the historic impact of the fisheries may be of interest and provide
useful information tomanagers. This requires separating theimpact
of the fisheries from that of the environment (Sibert et al., 2006). It
is also useful to evaluate the historical impact of the different gear
types (Maunder et al., 2006).