Articles by Keyword: Age Validation

Search results for Age Validation

We found 29 results for you
  1. A COMPARISON OF DIFFERENT METHODS OF AGE DETERMINATION IN THE SHARPTOOTH CATFISH <em>CLARIAS GARIEPINUS</em>

    A COMPARISON OF DIFFERENT METHODS OF AGE DETERMINATION IN THE SHARPTOOTH CATFISH <em>CLARIAS GARIEPINUS</em>

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Growth of the sharptooth catfish Clarias gariepinus from four southern African impoundments was estimated by back-calculating age from vertebrae and spines. Length frequency analysis supported the growth estimates derived from vertebrae but not those from spines.- Spines under-estimated the age...
  2. Application of the 3-PG model to a <em>Eucalyptus grandis</em> stand subjected to varying levels of water and nutritional constraints in KwaZulu-Natal, South Africa

    Application of the 3-PG model to a <em>Eucalyptus grandis</em> stand subjected to varying levels of water and nutritional constraints in KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    The 3-PG model has shown considerable potential as a tool for predicting forest productivity. As part of a model validation exercise, 3-PG was applied to an irrigated and fertilised Eucalyptus grandis stand in the KwaZulu-Natal Midlands. Simulations were run over...
  3. Validation of a Coping Scale in an African Context

    Validation of a Coping Scale in an African Context

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    The research aims were to compile and validate a multi-dimensional coping measure, taking African-centred coping behaviour into consideration. In a pilot study the Setswana-COPE (S-COPE) and the Africultural Coping Systems Inventory (ACSI) were administered to Setswana-speaking participants (N = 274)...
  4. Psychometric Properties of the Short Self-Regulation Questionnaire (SSRQ) in a South African Context

    Psychometric Properties of the Short Self-Regulation Questionnaire (SSRQ) in a South African Context

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    Self-regulation (SR), an important construct within the psychological well-being context, involves the ability to monitor behaviour, to contrast it with reference values and to introduce adjustments where necessary. A lack of validated measures of SR in the South African context...
  5. Standardization of a Spirituality Scale with a South African Sample

    Standardization of a Spirituality Scale with a South African Sample

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    The study reports on the psychometric properties of a Spirituality Scale developed in the USA in a South African setting. Respondents were 218 women and 84 men with a mean age of 25.54 years and an age range from 17...
  6. Validating An Adapted Measure of Organisational Energy in the South African Context

    Validating An Adapted Measure of Organisational Energy in the South African Context

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    This study validated an adapted measure of organisational energy, namely the Energy Scapes Profile (ESP), in the South African context, considering also possible differences in perceptions of organisational energy by the participants' demographics. Participants were a convenience sample of 304...
  7. Validation of the periodicity of growth increment deposition in otoliths from the larval and early juvenile stages of two cyprinids from the Orange–Vaal river system, South Africa

    Validation of the periodicity of growth increment deposition in otoliths from the larval and early juvenile stages of two cyprinids from the Orange–Vaal river system, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    This study tested the hypothesis that growth increments in larval largemouth yellowfish Labeobarbus kimberleyensis and smallmouth yellowfish L. aeneus from the Orange–Vaal river system, South Africa, are deposited daily. The periodicity of increment formation was determined by regular sampling and...
  8. Validation of the periodicity of opaque zone formation in the otoliths of four temperate reef fish from South Africa

    Validation of the periodicity of opaque zone formation in the otoliths of four temperate reef fish from South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    An oxytetracycline (OTC) marker was used to validate the periodicity of opaque zone deposition in the otoliths of Chrysoblephus laticeps, Cheimerius nufar, Cymatoceps nasutus (Sparidae) and Dichistius capensis (Dichistiidae) in the wild. Fish were injected with OTC and tagged with...
  9. Validation of growth zone deposition rate in otoliths and scales of flathead mullet <em>Mugil cephalus</em> and freshwater mullet <em>Myxus capensis</em> from fish of known age

    Validation of growth zone deposition rate in otoliths and scales of flathead mullet <em>Mugil cephalus</em> and freshwater mullet <em>Myxus capensis</em> from fish of known age

    Item type: Journal Article • Journal: African Journal of Marine Science
    Flathead mullet Mugil cephalus and freshwater mullet Myxus capensis are important components in South African estuarine fish communities and fisheries, but there is little information on their age and growth or age validation. This study validated the periodicity of growth...
  10. An end-to-end coupled model ROMS-N<sub>2</sub>P<sub>2</sub>Z<sub>2</sub>D<sub>2</sub>-OSMOSE of the southern Benguela foodweb: parameterisation, calibration and pattern-oriented validation

    An end-to-end coupled model ROMS-N<sub>2</sub>P<sub>2</sub>Z<sub>2</sub>D<sub>2</sub>-OSMOSE of the southern Benguela foodweb: parameterisation, calibration and pattern-oriented validation

    Item type: Journal Article • Journal: African Journal of Marine Science
    In order to better understand ecosystem functioning under simultaneous pressures (e.g. both climate change and fishing pressures), integrated modelling approaches are advocated. We developed an end-to-end model of the southern Benguela ecosystem by coupling the high trophic level model OSMOSE...