https://commons.ufh.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Paragaleus leucolomatus, a new shark from South Africa, with notes on the systematics of hemigaleid sharks (Carcharhiniformes: Hemigaleidae) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29632 Wed 12 May 2021 22:28:42 SAST ]]> Shark fishing effort and catch of the ragged-tooth shark Carcharias taurus in the South African competitive shore-angling fishery https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35937 Wed 12 May 2021 16:47:54 SAST ]]> Factors affecting recapture rates of raggedtooth sharks Carcharias taurus tagged off the east coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35618 Tue 06 Jul 2021 09:15:43 SAST ]]> Long-term catch and effort trends in Eastern Cape Angling Week competitions https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35711 Tue 06 Jul 2021 09:15:41 SAST ]]> Spatial and seasonal distribution patterns of juvenile and adult raggedtooth sharks (Carcharias taurus) tagged off the east coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35942 Thu 13 May 2021 07:25:06 SAST ]]> Population biology of Octopus vulgaris on the temperate south-eastern coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6768 Thu 13 May 2021 06:15:05 SAST ]]> A new species of the flatfish genus Chascanopsetta (Pleuronectiformes: Bothidae), from the coasts of Kenya and Somalia with comments on C.lugubris https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29768 Thu 13 May 2021 05:44:25 SAST ]]> Behavioural interactions of predators and spawning chokka squid off South Africa: towards quantification https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35516 Thu 13 May 2021 05:29:14 SAST ]]> Spatial and seasonal distribution patterns of the ragged-tooth shark Carcharias taurus along the coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35943 Thu 13 May 2021 04:57:09 SAST ]]> Resource partitioning by top predatory teleosts in eastern Cape coastal waters (South Africa) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5210 300 mm). Fish prey include Sardinops ocellata, Engraulis capensis, Pomadasys olivaceum and A. hololepidotus. Loligo reynaudi is the dominant cephalopod prey. Selectivity of A. hololepidotus was investigated. Prey were compared to catches made during a small-mesh trawl survey. The absence of certain species from the diet suggests that they avoid predation, possibly by outswimming A. hololepidotus (e.g. P. saltatrix) while large Galeichthys feliceps are rare in the diet, probably because of their formidable spines. Flatfishes, P. olivaceum, juvenile G. feliceps and small A. hololepidotus appear to be preferred food items. The depth distribution of predators and prey is described, and it appears that the distribution of predators may be influenced by their prey. Top predatory teleosts inhabiting coastal reefs are Cheimerius nufar, Petrus rupestris, Polysteganus praeorbitalis and Epinephelus guaza. Diet changes with size and locality but comprises small reef fishes for most of the sparids. C. nufar takes pelagic fish and squid more than the other predators while P. rupestris and P. praeorbitalis prey on cheilodactylids, clinids and other reef associated prey predominantly. E. guaza takes principally crabs and octopods. Classification and ordination analyses of the prey taken illustrated the inter-relationships of predators, which change with increasing size. The pelagic predators are most similar to each other and A. hololepidotus is closer to this group than to reef predators. The reef predators are less similar to each other, although this group as a whole is segregated from pelagic predators. Exceptions to this are large C. nufar and large P. praeorbitalis, which fall into the pelagic predator group, as they took pelagic prey to a large extent. These results are discussed and the patterns shown are compared to other studies and current resource partitioning theory. Two food webs are provided for the coastal waters of the eastern Cape. The pelagic food web has clupeids, engraulids and L. reynaudi as principal components. The reef system is more complex and the Clinidae, Cheilodactylidae and Octopus spp. are important. The use of food webs in management and in providing a framework for testing theoretical models is shown to be important. Research needs are identified and include more detailed work on the basic biology and ecology of the top predators and their prey.]]> Thu 13 May 2021 04:37:57 SAST ]]> Assessment of the likely sensitivity to climate change for the key marine species in the southern Benguela system https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35415 Thu 13 May 2021 04:07:19 SAST ]]> Age validation, growth, mortality, and demographic modeling of spotted gully shark (Triakis megalopterus) from the southeast coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35466 0.05), and von Bertalanffy growth model parameters for combined sexes were estimated to be L∞=1711.07 mm TL, k=0.11/yr and t0= –2.43 yr (n=86). Natural mortality was estimated at 0.17/yr. Age at maturity was estimated at 11 years for males and 15 years for females. Results of the demographic analysis showed that the population, in the absence of fishing mortality, was stable and not significantly different from zero and particularly sensitive to overfishing. At the current age at first capture and natural mortality rate, the fishing mortality rate required to result in negative population growth was low at F>0.004/ yr. Elasticity analysis revealed that juvenile survival was the principal factor in explaining variability in population growth rate.]]> Thu 13 May 2021 02:39:30 SAST ]]> Seasonality, behaviour and philopatry of spotted ragged tooth sharks Carcharias taurus in Eastern Cape nursery areas, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35910 Thu 11 Aug 2022 06:40:29 SAST ]]> Pessimistic assessment of white shark population status in South Africa: comment on Andreotti et al.(2016) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35799 Thu 11 Aug 2022 06:38:19 SAST ]]> Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa: https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38213 Mon 30 Aug 2021 14:17:03 SAST ]]>