All projections applied the same partial recruitment vector calculated from the matrix of fishing mortality at age for each stock. Natural mortality was (0.2) for all cases except that SPR at F = 0, G0 and the reference points were also calculated using an M = 0.53 for American plaice for Cold_2. This is done in the assessment to deal with unaccounted for mortality, some of which is thought to have been natural mortality ( Morgan and Brodie, 2001). Weight at age and proportion mature at age averaged over each time period (Warm_1, Cold_1, Cold_2, Warm_2) and over the whole time series were used in analyses together with the average RPS calculated over the corresponding period.