Browsing by Author "Cook, Peter A"

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    Effects of illumination, shading and temperature on the settlement, survival and growth of juvenile abalone (Haliotis midae)
    (2006) Muller, Liezl; Cook, Peter A; Griffiths, Charles L
    In aquaculture, a thorough knowledge of the specific environmental requirements of a species is needed in order to maximize growth and survival rates. Several studies have helped develop the technology necessary for the intensive commercial culture of Haliotis midae. However, a considerable amount of research is still required to develop the most appropriate and optimal method for the cultivation of this species. In particular there remains a lack information on the feeding habits of the early life stages and as a result the survival rates of spat are still low and variable. This prompted the design of three experiments to determine the best illuminance and water temperature conditions to maximize the settlement, growth and survival of H midae post-larvae. These experiments also investigated what effect different illumination and water temperatures would have on the growth of diatom colonies as substrate for the abalone post-larvae during and after settlement.
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    Taxonomy, distribution and toxicity of dinoflagellate species in the southern Benguela current, South Africa
    (2003) Botes, Lizeth; Hedderson, Terry A; Cook, Peter A; Pitcher, Grant C
    The threat of harmful algal blooms with their attendant problems, exists throughout the Benguela region. In the southern Benguela upwelling system, water discolorations, referred to as 'red tides', are common and usually attributed to dinoflagellate species. The first aim of the thesis was to investigate the taxonomy of gymnodinioid species in the southern Benguela current. In order to investigate the morphology of the southern Benguela isolates, a simple and rapid scanning electron microscope preparative technique was developed. In the course of these studies, a new genus and new species were identified and described.