1. The SCAA Assessment of SA hake Rebecca Rademeyer and Doug Butterworth
The SCAA Assessment of SA hake Rebecca Rademeyer and Doug Butterworth . MARAM

2. The fishery in 2006
Low catch rates had the fishery hardly returning any profit
Species disaggregated assessments pointed to a highly depleted M. paradoxus resource
MSC certification required that resource returned to Bmsy

3. Key SCAA assessment model features
Two species, treated as separate populations, but assessed within the same framework to take account of commercial size data that cannot be disaggregated by species. Furthermore assumptions required for prior to 1978 for which no species disaggregated data, including total catch data, are available.
Sex-disaggregated
Estimate growth curves internally, fitting to age-length information under the assumption of time-invariant length-at-age distributions
Different selectivities on the WC and SC to reflect different age/ length structures

4. Data fitted
Total catch for each fleet (species disaggregated externally – pre-1978 assumption; post-1978 analysis)
CPUE:
ICSEAF CPUE series (pre-1978, species-aggregated)
GLM-standardised CPUE (1978-present, disaggregated by species and coast)
Commercial catch-at-length by fleet (species and sex disaggregated information for the longline fleet only)
Survey indices (4 series: WC summer, WC winter, SC spring, SC autumn; species disaggregated; since 2003 alternation of gear on the research vessel requires the use of calibration factors)
Survey catch-at-length (4 series as above; species disaggregated; sex-disaggregated for some years)
Age-length keys (species- and sex-disaggregated for some years only)

5. Commercial selectivity-at-length
M. paradoxus M. capensis

6. Fit to CPUE data

7. Fit to survey data

8. Spawning biomass trajectory
M. paradoxus

9. Spawning biomass trajectory
M. capensis

10. Recruitment trajectories
M. paradoxus M. capensis
Note relatively poor recruitment over years around 2010

11. Projections under OMP-2014.
(Reference Case)

12. SCCA assessment – What next?
Refine assessment to provide Operating Models for 2018 SA hake OMP revision process
Use M(year, age) matrix from hake predation model