Scalefish Southern Garfish Catch MSY

Catch MSY-Results

Catch-MSY results based on the assumption of “medium” resilience suggest that Southern Garfish biomass should theoretically be recovering (Figure 1), with estimates of harvest rate and catch both well below estimates of corresponding sustainable limits (Ftarget = 0.21; MSY = 66.40) (Figure 2, Figure 3). Median estimates of biomass depletion peaked at 13% of unfished levels in 2015/16 (lower 90% CI = 7%) and should have theoretically recovered to 28% of unfished levels in 2019/20 (lower 90% CI = 8%) (Figure 1). However, empirical evidence of recovery is lacking.

Figure 1: Trends in estimated biomass depletion (biomass divided by unfished biomass) and associated confidence intervals (CIs). The dotted red line marks a common target reference point, which is the biomass assumed to deliver the maximum sustainable yield (Btarget). The continuous red line marks a limit reference point (Blimit).
Figure 2: Trends in estimated biomass depletion (biomass divided by unfished biomass) and associated confidence intervals (CIs). The dotted red line marks a common target reference point, which is the biomass assumed to deliver the maximum sustainable yield (Btarget). The continuous red line marks a limit reference point (Blimit).
Figure 3: Trends in harvest rate and associated confidence intervals (CIs) relative to the estimated target fishing mortality (Ftarget).

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