scholarly journals Movement patterns of the East Coast rock lobster Panulirus homarus rubellus on the coast of KwaZulu-Natal, South Africa

2011 ◽  
Vol 45 (1) ◽  
pp. 85-101 ◽  
Author(s):  
E Steyn ◽  
MH Schleyer
Keyword(s):  
South Africa ◽  
East Coast ◽  
Movement Patterns ◽  
Rock Lobster ◽  
Kwazulu Natal

The 2005 KwaZulu-Natal sardine run survey sheds new light on the ecology of small pelagic fish off the east coast of South Africa

2010 ◽  
Vol 32 (2) ◽  
pp. 337-360 ◽  
Author(s):  
J C Coetzee ◽  
D Merkle ◽  
L Hutchings ◽  
C D van der Lingen ◽  
M van den Berg ◽  
...  
Keyword(s):  
South Africa ◽  
East Coast ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Kwazulu Natal

Identifying the drivers of the pelagic ecosystem of an oligotrophic bight (KwaZulu–Natal, South Africa) using stable isotopes (δ13C, δ15N) and C : N ratio analysis

2016 ◽  
Vol 67 (11) ◽  
pp. 1750 ◽  
Author(s):  
Ander M. de Lecea ◽  
Rachel Cooper ◽  
Albertus J. Smit
Keyword(s):  
South Africa ◽  
East Coast ◽  
Austral Summer ◽  
Ratio Analysis ◽  
Wet Season ◽  
Terrestrial Organic Matter ◽  
Pelagic Ecosystem ◽  
Riverine Input ◽  
Kwazulu Natal ◽  
Marine System

The international literature highlights the importance of understanding the role and fate of terrestrial organic matter (OM) in the marine system, yet little is known about this on the oligotrophic east coast of South Africa. Within the Bight, three important processes make OM biologically available: (1) a topographically induced upwelling cell (north), (2) a Cyclonic Eddy (south), and (3) riverine input. We hypothesise that: (i) these OM sources differ substantially in their isotope ratios, and (ii) zooplankton at the inshore region has an isotope signature linked to localised fluvial fluxes. Particulate OM samples were collected at five locations along the Bight and in three main estuaries during austral summer and winter seasons in 2010 and subjected to isotopic and mixing model analysis. Riverine input played an important role in this ecosystem inshore during the wet season. Only marine OM played a role as a biological driver offshore and at all sites during the dry season. Although there were indications that the upwelling cell did occur, it was not confirmed as active in either season. The current study provides valuable insights into the Bight's biological functioning and principle insights into the fate of terrestrial organic carbon on the east coast of southern Africa.

Elemental Analysis and Nutritional Value of Seaweed from the East Coast of KwaZulu-Natal, South Africa

2016 ◽  
Vol 50 (3) ◽  
pp. 580-590 ◽  
Author(s):  
Kimona Kisten ◽  
Roshila Moodley ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
South Africa ◽  
Elemental Analysis ◽  
Nutritional Value ◽  
East Coast ◽  
Kwazulu Natal

Spatial and seasonal distribution patterns of juvenile and adult raggedtooth sharks (Carcharias taurus) tagged off the east coast of South Africa

2007 ◽  
Vol 58 (1) ◽  
pp. 127 ◽  
Author(s):  
M. L. Dicken ◽  
A. J. Booth ◽  
M. J. Smale ◽  
G. Cliff
Keyword(s):  
South Africa ◽  
East Coast ◽  
Average Rate ◽  
Anthropogenic Activities ◽  
Average Distance ◽  
Movement Patterns ◽  
Release Site ◽  
Distribution Patterns ◽  
Juvenile Sharks ◽  
Carcharias Taurus

Understanding the movement patterns of raggedtooth sharks (Carcharias taurus) is crucial in defining habitat use and evaluating the effects of exploitation and anthropogenic activities. Between 1984 and 2004, 1107 C. taurus juveniles (<1.8-m TL) and 2369 C. taurus maturing subadults and adults (>1.8-m TL) were tagged and released along the east coast of South Africa. In total, 125 C. taurus juveniles and 178 C. taurus maturing subadults and adults were recaptured, representing recapture rates of 11.2% and 7.5% respectively. The average distance travelled by juvenile sharks was 18.7 km (95% CI = 10.8–26.6 km). Juvenile sharks displayed site fidelity to summer nursery areas. The average distance travelled by maturing and adult sharks was 342 km (95% CI = 275–409 km). One female shark, however, was recaptured 1897 km from its original release site. The average rate at which pregnant sharks moved south from their gestation to pupping grounds was 2.6 km day–1 (95% CI = 2.04–3.16 km day–1). This study highlights the differences in movement patterns between C. taurus juveniles and adults and suggests philopatric behaviour in both life-history stages.

scholarly journals Movement patterns and growth rate of cavebass Dinoperca petersi (Pisces: Dinopercidae) in the iSimangaliso Marine Protected Area, South Africa

2021 ◽  
Vol 19 (2) ◽  
pp. 45-59
Author(s):  
Bruce Q. Mann ◽  
Gareth L. Jordaan ◽  
Ryan Daly
Keyword(s):  
South Africa ◽  
Growth Rate ◽  
Protected Area ◽  
Marine Protected Area ◽  
Movement Patterns ◽  
Home Range Size ◽  
Average Growth ◽  
Kwazulu Natal ◽  
High Site

Dinoperca petersi is a relatively common fish species caught in the line-fishery in KwaZulu-Natal (KZN), South Africa. Yet, little is known about the biology and ecology of this species. Movement patterns and growth rate of this species were studied based on data obtained from a long-term tag-recapture study conducted in the iSimangaliso Marine Protected Area in northern KZN between 2001-2019. Results showed that D. petersi is a highly resident species with a linear home-range size of 290-405 m. While most fish showed high site fidelity, 8.8 % of the tagged fish showed wider ranging movements of 2.4-90 km. However, only 5 fish showed movements out of no-take zones into adjacent exploited areas, suggesting limited adult spillover. Growth rate of tagged fish was found to be reasonably slow compared to other sympatric predatory reef fish with an average growth rate of 61.76 mm y–1 for smaller fish (gα = 300) and 9.58 mm y–1 for larger fish (gβ = 550). Based on these life history characteristics, options for the future conservation and management of this species are discussed.

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