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  1. 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 (CLARIAS GARIEPINUS) AND ITS IMPORTANCE IN FISH CULTURE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Douglas Clay --- Department of Agriculture, Zimbabwe
    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%...
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  2. Age structure or functional response? Reconciling the energetics of surplus production between single-species models and ECOSIM

    Age structure or functional response? Reconciling the energetics of surplus production between single-species models and ECOSIM

    Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K. Y. Aydin
    Whole-ecosystem foodweb models, specifically the dynamic model ECOSIM, contain specific hypotheses for surplus production that differ from traditional single-species management models. Specifically, ECOSIM begins with an assumption that all species are tightly connected and energetic surplus does not arise through...
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  3. Is the largest African penguin colony in South Africa influencing local ocean productivity?

    Is the largest African penguin colony in South Africa influencing local ocean productivity?

    Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Passuni --- , South Africa LRD Human --- , South Africa SN Riddick --- , United States P Pattrick --- , South Africa M Bizani --- , South Africa SHP Deyzel --- , South Africa NA Strydom --- , South Africa TG Bornman --- , South Africa L Pichegru --- , South Africa
    In coastal waters, nutrient supplies originate principally from allochthonous sources, such as inputs from rivers, estuaries or oceanic waters. Recently, it has been suggested that marine life contributes to the nutrient load, with penguin colonies being the largest contributor worldwide...
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