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Browsing by Author "Griffiths, Charles L"

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Abundance and mortality of anchovy eggs caused by cannibalism and intraguild predation, and the potential effect on anchovy recruitment and clupeoid fluctuations

Author: Szeinfeld, Edy Sylvia Valdes Date: 1991 This thesis is structured in the form of five main chapters, each written in the form of an independent paper and supported by a general conclusion and one previously published paper on the same general theme. The central theme is the dynamics, ... Read more
An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa

Author: Veldhuis, Helen Anne Date: 1987 The Knysna estuary system, on the south coast of South Africa, was sampled for zooplankton over period of one year. All species were recorded and an attempt was made at relating the distribution of populations to physical factors within the ... Read more
Aspects of the biology and population dynamics of the deep-water commercially exploited crabs off South West Africa/Namibia

Author: Melville-Smith, Roy Date: 1987 Two crab species have been exploited on the South West African/ Namibian continental slope since 1973. The deep-sea red crab Geryon maritae forms >99 percent of the catch made by traps, the balance being a by-catch of stone crab Lithodes ... Read more
Aspects of the biology of, and fishery for, the Hottentot, Pachymetopon blochii (Val.) (Sparidae), in the Western and Southwestern Cape

Author: Pulfrich, Andrea Christine Date: 1987 Data extracted from historic records have been used together with information collected during a survey of major fishing centres in the west and southwest Cape, from Port Nolloth to Struis Bay, to document the development of the handline ... Read more
Aspects of the biology, ecology and fishery of the beaked clam Eumarcia paupercula (Holten, 1802), in Maputo Bay

Author: Mugabe, Eulália D. Date: 2016 Clam populations globally have declined, or been depleted, with one of the major causes being uncontrolled human exploitation. This thesis investigates the population structure, growth, reproduction and exploitation of the beaked clam Eumarcia ... Read more
Behavioural ecology of white sharks carcharodon carcharias in False Bay, South Africa: towards improved management and conservation of a threatened apex predator

Author: Kock, Alison Ann Date: 2014 The coastal waters off South Africa support a significant proportion of the global white shark population, with at least four well-established coastal aggregation sites. How critical these sites are to the southern African and hence global ... Read more
Biogeographical patterns of southern African marine invertebrates

Author: Scott, Robyn Date: 2009 Biogeography is defined as the study of life, in a spatial and temporal context, with respect to the analysis and explanation of patterns for a given area. The tendency for species richness and diversity to increases towards the equator, where ... Read more
Biological structure of an Agulhas Bank subtidal reef community and consumption estimation for a dominant species

Author: Duvenage, Ian R Date: 1988 This thesis reports on an investigation into some aspects affecting and contributing to the flow of organic matter through a subtidal reef environment. In particular, the contribution of Porifera to the organic matter pool in terms of biomass ... Read more
The biology, distribution and ecology of Lampanyctodes hectoris and Maurolicus muelleri along the South-African coast

Author: Prosch, Richardt Murray Date: 1986 Lampanyctodes hectoris, commonly called lanternfish, is a myctophid and was first recorded in the South African pelagic catches in 1969. The average annual landings since then have been approximately 4% of the pelagic catch, the largest being ... Read more
Brooding behaviour in Ophioderma wahlbergii, a shallow-water brittle star from South Africa

Author: Landschoff, Jannes Date: 2014 The brooding behaviour and brooded young are described for Ophioderma wahlbergii Müller & Troschel 1842, a large, common brittle star from the coastal waters of South Africa. Twenty specimens were collected each month from June 2013 – May ... Read more
Catch, effort and socio-economic characteristics of the gill and beach-seine net fisheries in the Western Cape, South Africa

Author: Hutchings, Kenneth Date: 2000 This study was conducted with the overall objective of providing scientific infonnation relevant to the management of the gill and beach-seine net fisheries, particularly with respect to decisions about increased participation in the fisheries. ... Read more
Climate and Bioinvasives drivers of change on South African Rocky shores?

Author: Mead, Angela Date: 2011 The overall aims of the thesis were to assess spatio-temporal change in macro species assemblages at sites located around the South African coast. Detected changes were considered in parallel with regional patterns of bioinvasion and climate ... Read more
The commercial fishery for sharks in the South-Western Cape, with an analysis of the biology of the two principal target species, Callorhinchus Capensis Dumeril and Galeorhinus Galeus Linn

Author: Freer, David Walter Leacroft Date: 1992 The South African shark fishery began in World War 2, based on a demand for shark liver oil. The initial landings are estimated at 3750 tons per annum, but have since declined to approximately 820 tons of shark, principally Galeorhinus galeus, ... Read more
Comparative ecology and physiology of four South African mussel species with notes on culture potential

Author: Van Erkom Schurink, Corine Date: 1991 The objective of this study was to compare the distribution patterns, reproductive cycles, growth rates and physiological processes in four species of South African marine mussels - Aulacomya ater, Choromytilus meridionalis, Mytilus ... Read more
Contributions to the taxonomy of South African hermit crabs (Crustacea: Decapoda: Paguroidea) – integrating microCT scanning and barcoding

Author: Landschoff, Jannes Date: 2018 Hermit crabs form an important component of the marine benthos and globally more than 1,200 species have been described. In the unique bioregion of South Africa, hermit crabs are poorly known, and the last taxonomic revision of the group was ... Read more
Deep water parapagurid hermit crabs: their distribution, abundance, population structure and associations in the Southern Benguela

Author: Wright, Amy Grace Date: 2017 The parapagurids Sympagurus dimorphus (Studer, 1883) and Parapagurus bouvieri (Stebbing, 1910) dominate South African deeper-water benthic invertebrate communities. Samples from the 2016 DAFF bi-annual hake demersal research trawl surveys ... Read more
Demographics of a seasonal aggregation of white sharks at Seal Island, False Bay, South Africa

Author: Hewitt, Adrian Michael Date: 2014 White sharks (Carcharodon carcharias) are widely distributed, ecologically important marine apex predators that are considered to be vulnerable to extinction. Given their crucial roles in structuring marine ecosystems, their populations need ... Read more
Development of a quality index method (QIM) scheme and its implementation in a shelf-life study of kingklip (Genypterus capensis)

Author: Gebremariam, Thomas W Date: 2003 In this study Quality Index Method (QIM) schemes for raw headed and gutted (H&G) fish and skinless fillets as well as cooked fillets of kingklip (Genypterus capensis) were developed in a shelf life study. The QIM schemes for raw H&G and ... Read more
Dynamics and utilization of surf zone habitats by fish in the South-Western Cape, South Africa

Author: Clark, Barry Malcolm Date: 1997 The main objectives of this study were to examine, by means of beach seine netting, the composition, abundance and size structure of fish assemblages frequenting surf-zone habitats in the south-western Cape, South Africa, to investigate ... Read more
The ecology of three sandy beaches on the West Coast of South Africa

Author: Bally, Roderick Peter Alexander Date: 1981 The ecology of three sandy beaches on the west coast of South Africa is examined in this thesis. The first chapter constitutes an introduction to the subject and presents a brief review of studies carried out on beaches in South Africa in ... Read more

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