Articles by Author: Tania S Douglas

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  1. Towards the socialization of science, technology and innovation for African development

    Towards the socialization of science, technology and innovation for African development

    Developing countries, particularly those in Africa, have not been able to fully exploit the opportunities presented by recent Science, Technology and Innovation (STI) advances to address their developmental needs. The reasons for this include lack of supporting infrastructure, shortage of...
  2. THE BAILEY TRANSFORM AND D.B. SEARS

    THE BAILEY TRANSFORM AND D.B. SEARS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In recent years, the pioneering q-series methods initiated by Rogers and extended by Bailey have found extensive applications in number theory and physics. In this paper we show how some of the work of D.B. Sears can be understood and...
  3. UTILIZATION OF PLANT MATERIALS BY JUVENILE AFRICAN CATFISH <em>(CLARIAS GARIEPINUS)</em> AND ITS IMPORTANCE IN FISH CULTURE

    UTILIZATION OF PLANT MATERIALS BY JUVENILE AFRICAN CATFISH <em>(CLARIAS GARIEPINUS)</em> AND ITS IMPORTANCE IN FISH CULTURE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Juvenile African catfish Clarias gariepinus between 100 and 200 mm total length from Lake McIlwaine, Zimbabwe are able to digest plant proteins. The digestibility of three major plant proteins (maize, sunflower seed and soya meal) was 30,0, 65,4 and 84,3%...
  4. 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...
  5. PRODUCTION OF THE AFRICAN CATFISH <em>(CLARIAS GARIEPINUS)</em> I. GROWTH, MORTALITY AND YIELD SOUTH OF THE ZAMBEZI

    PRODUCTION OF THE AFRICAN CATFISH <em>(CLARIAS GARIEPINUS)</em> I. GROWTH, MORTALITY AND YIELD SOUTH OF THE ZAMBEZI

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Clarias gariepinus were sampled from eight water bodies in southern Africa between 1973 and 1975. Aging results indicate a similar growth pattern for most areas with a near linear age-length relationship. Between year growth compensation was found to be present...
  6. PRODUCTION OF THE AFRICAN CATFISH <em>(CLARIAS GARIEPINUS)</em> II. POPULATION PRODUCTION AS ESTIMATED FROM SURPLUS PRODUCTION MODELS FOR LAKE MCILWAINE, ZIMBABWE

    PRODUCTION OF THE AFRICAN CATFISH <em>(CLARIAS GARIEPINUS)</em> II. POPULATION PRODUCTION AS ESTIMATED FROM SURPLUS PRODUCTION MODELS FOR LAKE MCILWAINE, ZIMBABWE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The population production of Clarias gariepinus was studied by Schaefer type surplus production models. The maximum sustainable yield of African catfish in Lake McIlwaine, Zimbabwe was found to be in the range of 33 000 to 41 000 kg (13,46...