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Assessment of the South African hake resource taking its two-species nature into account
Rademeyer, R.A.; Butterworth, D.S.; Plagányi, E.E. (2008). Assessment of the South African hake resource taking its two-species nature into account. Afr. J. Mar. Sci. 30(2): 263-290
In: African Journal of Marine Science. NISC/Taylor & Francis: Grahamstown. ISSN 0257-7615, more
Peer reviewed article  

Available in Authors 

Keywords
    Hake fisheries; Merluccius capensis Castelnau, 1861 [WoRMS]; Merluccius paradoxus Franca, 1960 [WoRMS]; South Africa [Marine Regions]

Authors  Top 
  • Rademeyer, R.A.
  • Butterworth, D.S.
  • Plagányi, E.E.

Abstract
    The commercially valuable hake fishery off South Africa consists of two morphologically similar species, the shallow-water Cape hake Merluccius capensis and the deep-water Cape hake M. paradoxus. Because catch-andeffort statistics collected from the fishery are not species-disaggregated, previous published quantitative assessment methods have treated the two hake species as one. Furthermore, recent evidence suggests that (although treated as two separate populations in past assessments) the South and West coasts components of each species form a single stock. This paper describes the development of the first fully species-disaggregated coast-wide baseline assessment of the South African hake resource. M. paradoxus is estimated to be currently at <10% of its pre-exploitation level whereas M. capensis is estimated to be well above its maximum sustainable yield level. By taking into consideration the primary sources of uncertainty in this assessment, a Reference Set of 24 operating models is developed to be used in Operational Management Procedure testing.

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