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Depth-stratified density estimates and distribution of the Cape hake Merluccius capensis and M. paradoxus off Namibia deduced from survey data, 1990–1999
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: L-M. BurmeisterIn this study demersal survey data for the period 1990–1999 are used to investigate the average distribution of the Cape hake Merluccius capensis and M. paradoxus off Namibia in terms of density and mean length. Further, biomass estimates are compared... -
Is there a single stock of Merluccius paradoxus in the Benguela ecosystem?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L BurmeisterThe deep-water Cape hake, Merluccius paradoxus, is one of two hake species found off South Africa and Namibia. In the past it was assumed that there were separate stocks of M. paradoxus off Namibia, and off the west and south... -
Spatial description of hake-directed fishing activity off the west coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TP Fairweather AJ Booth WHH Sauer RW LeslieHistorically, the two species of Cape hakes Merluccius capensis and M. paradoxus off South Africa were commercially exploited exclusively by demersal trawling. In 1994, hake-directed demersal longline was introduced on an experimental basis, and in 1998 was initiated as a... -
A robust method for generating separate catch time-series for each of the hake species caught in the Namibian trawl fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Johnsen --- , Norway J Kathena --- Ministry of Fisheries and Marine Resources, NamibiaMerluccius capensis and M. paradoxus are morphologically very similar and cannot be registered separately by species in the Namibian commercial hake catches. This prevents a biologically plausible single-species stock assessment from being carried out. Here, species-separated data from an observer... -
A history of recent bases for management and the development of a species-combined Operational Management Procedure for the South African hake resource
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RA Rademeyer DS Butterworth ÉE PlagányiThe bases for historical catch limits placed on the hake fishery are reviewed in brief for earlier years and then in some depth over the period from 1991 when the Operational Management Procedure (OMP) approach was introduced for this fishery... -
Exploring the spatial distribution patterns of South African Cape hakes using generalised additive models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Grüss --- Institut de Recherche pour le Développement [IRD], France D Yemane --- Branch: Fisheries Management, South Africa TP Fairweather --- Branch: Fisheries Management, South AfricaWe developed delta generalised additive models (GAMs) to predict the spatial distribution of different size classes of South African hakes, Merluccius capensis and M. paradoxus, using demersal trawl survey data and geographical (latitude and longitude) and environmental features (depth, temperature,... -
New age-determination method based on fast growth rate of Cape hake Merluccius capensis in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MR Wilhelm --- Department of Fisheries and Aquatic Science, Namibia SC Paulus --- National Marine Information and Research Centre (NatMIRC), Namibia S Kashava --- National Marine Information and Research Centre (NatMIRC), NamibiaNamibia’s most important commercial fisheries resource, the shallow-water Cape hake Merluccius capensis, is currently assessed using statistical catch-at-age analysis. Age data obtained from otoliths constitute an important data component of this model. Recent age-validation studies of M. capensis showed that... -
Low hypoxia tolerance in larvae of the sardine Sardinops sagax and anchovy Engraulis encrasicolus may limit their stock recovery in the northern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Kunzmann --- Leibniz Centre for Tropical Marine Research (ZMT), Germany RM Imam --- Leibniz Centre for Tropical Marine Research (ZMT), Germany SJ Geist --- Leibniz Centre for Tropical Marine Research (ZMT), GermanyPhysiological traits of five key fish species (Cape hake Merluccius spp., pelagic goby Sufflogobius bibarbatus, Cape horse mackerel Trachurus capensis, European anchovy Engraulis encrasicolus and sardine Sardinops sagax) from the northern Benguela upwelling system (NBUS) were compared during their larval...