During periods of low productivity, RPS was very low for both populations. The lack of inclusion of recruitment in F0.1 and F40%SPR meant that under conditions of low RPS they could be much higher than FMSY. Cervino et al. (2013) also found a discrepancy between FMSY and yield per recruit reference points using a Ricker stock recruit curve, in that case comparing different measures of reproductive potential. Kell and Fromentin (2007) determined that F0.1 performed better than F40%SPR when carrying capacity was variable. How well a particular type of reference point performs will depend on what components of productivity are changing. Given the large impact of RPS seen here and the generally large variation in recruitment experienced by fish stocks, MSY based reference points may be more robust than those based on YPR or SPR