Average SPR for plaice was an order of magnitude lower than for cod (Fig. 3) as a result of lower weight and later maturity at age for plaice. For both populations there has been a general increase in SPR since the beginning of the series but this increase is much greater for plaice. This results in higher SPR in Cold_2 and Warm_2, the most recent periods. The SPR for plaice during the Cold_2 is almost zero if an M of 0.53 is assumed, as it is for that time period in the assessment.