The ichthyofauna in the Port of Ngqura, South Africa

Dicken, ML

doi:10.2989/1814232x.2010.538139

Cited by 6 publications

(3 citation statements)

References 50 publications

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“…The main difference between the above areas and the Dwesa-Cwebe MPA was the abundance of A. japonicus and P. grande. Only the Port of Ngqura, which is not a formally protected area, had similar abundances of A. japonicus (Dicken 2010). Inclusion of the Mbashe Estuary as a third sampling site in October 2010 revealed a high catch rate of juvenile A. japonicus suggesting that this estuary provides an important nursery area for this species.…”

Section: Discussionmentioning

confidence: 98%

“…In the case of the competition data (Pradervand 2004), these were collected over a substantially longer time period , from the Umtamvuna to the Mbashe River. Further afield, the Port of Ngqura (Dicken 2010), Tsitsikamma MPA (Götz et al 2008) and the Goukamma MPA (Dicken 2010;Götz et al 2008;Pradervand & Hiseman 2006) were also more species diverse than the Dwesa-Cwebe MPA (Table 5).…”

Section: Discussionmentioning

confidence: 99%

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Preliminary assessment of surf-zone and estuarine line-fish species of the Dwesa-Cwebe Marine Protected Area, Eastern Cape, South Africa

Venter

Mann²

2012

Koedoe

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A preliminary assessment of surf-zone and estuarine line fish was carried out in the DwesaCwebe Marine Protected Area (MPA), on the Wild Coast, South Africa. The purpose was to provide baseline data on inshore line-fish stocks in the MPA. A total of 28 species was recorded, of which 53% have a conservation status reflecting some concern and 43% are endemic to southern Africa. This highlights the value of the MPA for protection of important line-fish species. Within the MPA, localised differences were detected in species diversity, size frequency and catch per unit effort between unexploited and illegally exploited areas. These differences were more prominent in slow growing, long-lived species. It thus appears that illegal exploitation is negatively affecting fish populations within the MPA, which counteract and potentially could eliminate the benefits of fish protection typically associated with no-take MPAs. These results highlight the need for improved law enforcement and better communication with neighbouring communities to increase awareness. It is further recommended that the current no-take status of the MPA should be maintained. In addition, baseline fisheries information was collected on certain fish species that could be used to inform future conservation management of the MPA.Conservation implications: The Dwesa-Cwebe Marine Protected Area is unique and important for the conservation of key surf zone and estuarine fish species. However there is a significant risk to the fish populations due to illegal exploitation. Key interventions should include enhanced law enforcement but, more important, the creation of alternative livelihoods and long term sustainable benefits to local communities.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Preliminary assessment of surf-zone and estuarine line-fish species of the Dwesa-Cwebe Marine Protected Area, Eastern Cape, South Africa

Venter

Mann²

2012

Koedoe

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“…area where only scientific fishing is allowed. The constructed concrete port wall forms an artificial bay, creating a calm and sheltered habitat, that attracts a large number of teleost fish and elasmobranchs (Dicken, 2010). Common smooth-hounds tagged in the harbour were typically recaptured in the same location, showing that this area provides an important habitat for these sharks that either remain for extended periods of time or return regularly.…”

Section: Fish Fishmentioning

confidence: 99%

Site fidelity and shallow genetic structure in the common smooth‐hound shark Mustelus mustelus confirmed by tag‐recapture and genetic data

Klein

Asbury

Silva³

et al. 2021

Journal of Fish Biology

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The common smooth-hound shark, Mustelus mustelus, is a widely distributed demersal shark under heavy exploitation from various fisheries throughout its distribution range. To assist in the development of appropriate management strategies, the authors evaluate stock structure, site fidelity and movement patterns along the species' distribution in southern Africa based on a combination of molecular and long-term tag-recapture data. Eight species-specific microsatellite markers (N = 73) and two mitochondrial genes, nicotinamide adenine dehydrogenase subunit 4 and control region (N = 45), did not reveal any significant genetic structure among neighbouring sites. Nonetheless, tagging data demonstrate a remarkable degree of site fidelity with 76% of sharks recaptured within 50 km of the original tagging location. On a larger geographic scale, dispersal is governed by oceanographic features as demonstrated by the lack of movements across the Benguela-Agulhas transition zone separating the South-East Atlantic Ocean (SEAO) and South-West Indian Ocean (SWIO) populations. Microsatellite data supported very shallow ocean-based structure (SEAO and SWIO) and historical southward gene flow following the Agulhas Current, corroborating the influence of this dynamic oceanographic system on gene flow. Moreover, no movements between Namibia and South Africa were observed, indicating that the Lüderitz upwelling formation off the Namibian coast acts as another barrier to dispersal and gene flow. Overall, these results show that dispersal and stock structure of M. mustelus are governed by a combination of behavioural traits and oceanographic features such as steep temperature gradients, currents and upwelling systems.

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Distribution of soft bottom macrobenthic communities in tropical marinas of Singapore

Toh

et al. 2019

Urban Ecosyst

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The ichthyofauna in the Port of Ngqura, South Africa

Cited by 6 publications

References 50 publications

Preliminary assessment of surf-zone and estuarine line-fish species of the Dwesa-Cwebe Marine Protected Area, Eastern Cape, South Africa

Preliminary assessment of surf-zone and estuarine line-fish species of the Dwesa-Cwebe Marine Protected Area, Eastern Cape, South Africa

Site fidelity and shallow genetic structure in the common smooth‐hound shark Mustelus mustelus confirmed by tag‐recapture and genetic data

Distribution of soft bottom macrobenthic communities in tropical marinas of Singapore

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