Bastard Trumpeter Catch MSY

Catch-MSY Results

Catch-MSY results based on the assumption of “medium” resilience suggest that Bastard Trumpeter biomass should theoretically be recovering (Figure 1), with catch and estimated harvest rates well below estimates of sustainable limits (Ftarget = 0.20; MSY = 27.40) (Figure 2, Figure 3). Estimates of median biomass depletion peaked at 10% of unfished levels in 2010/11 (lower 90% CI = 7%) compared to 27% in the current season (lower 90% CI = 10%) (Figure 1).

Figure 1: Trends in estimated biomass depletion (biomass (B) divided by unfished biomass (B0)) 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 harvest rate and associated confidence intervals (CIs) relative to the estimated target fishery mortality (Ftarget).
Figure 3: Trends in catch relative to the estimated maximum sustainable yield (MSY) and associated confidence intervals (CIs).