FISHERIES_2017_SEP_SWG-DEM_27 Toothfish assessment.pdf (807.92 kB)
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Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2016

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The assessment of the Prince Edward Islands (PEI) toothfish (Dissostichus eleginoides) resource carried out by Brandão and Butterworth (2016) is updated to take further data now available for 2016 into account. This update again also incorporates (now updated) tag-recapture data and a new basis to estimate the extent of cetacean depredation. For the Base case and many of the assessment sensitivities, the resource is estimated to be at a depletion (in relation to its average pre-exploitation level in terms of spawning biomass) in the 41-52% range (this is approaching 10% lower than for the 2016 assessment before the new data were added). On this occasion, unlike in earlier years, inclusion of the tag-recapture data suggests more pessimistic point estimates but does still reduce estimation variance.

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Department of Mathematics and Applied Mathematics, University of Cape Town