Articles by Keyword: African Silver Catfish
Search results for African Silver Catfish
We found 214 results for you
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Systematic reinstatement of <em>Schilbe depressirostris</em> (Peters, 1852), based on differences in DNA barcoding and morphology, from <em>Schilbe intermedius</em> Rüppell, 1832 (Siluriformes, Schilbeidae)
Item type: Journal Article • Journal: African Journal of Aquatic ScienceClimate change poses an unprecedented threat to biodiversity worldwide. Consequently, unrecognised taxa may not receive adequate conservation attention to survive. We used molecular and morphological data to address the challenge of species delimitation within the genus Schilbe. The presence or... -
A COMPARISON OF ALLOZYME HETEROZYGOSITY AND LIFE HISTORY VARIABLES IN FOUR STRAINS OF AFRICAN CATFISH <em>(CLARIAS GARIEPINUS)</em>
Item type: Journal Article • Journal: Southern African Journal of Aquatic SciencesWe studied allozyme polymorphism and its relation to morphological characteristics in 122 individuals from four lines of African catfish. Starch gel electrophoresis was used to screen 26 loci, of which five were polymorphic. Average heterozygosity levels differed moderately among lines... -
Genetic diversity and gene flow in <em>Clarias gariepinus</em> from Lakes Victoria and Kanyaboli, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic ScienceThe African catfish Clarias gariepinus is an important species in the rapidly expanding aquaculture industry in East Africa. Most Kenyan catfish farmers use stocks with unknown genetic characteristics, with uncertified seeds and inter-basin exchange of brood stocks threatening the genetic... -
A comparison of three techniques for fluorochrome marking of juvenile <em>Clarias gariepinus</em> otoliths
Item type: Journal Article • Journal: African ZoologyIntramuscular injection of the antibiotic oxytetracycline (OTC) has been the only method previously employed for chemically marking C. gariepinus otoliths for ageing studies. This study compared intramuscular injection, immersion, and dietary incorporation methods of administering OTC to determine the most... -
An assessment of cassava African mosaic disease in South Africa and Swaziland
Item type: Journal Article • Journal: South African Journal of Plant and SoilA preliminary assessment of the distribution of African mosaic disease (AMD) in cassava in Natal, Transvaal and Swaziland suggests that at present the threat to commercial plantings in Natal has been contained through (i) commercial establishment of cassava in an... -
Suppression of silver-leaf bitter apple (<em>Solanum elaeagnifolium</em> Cav.) by cultivated pasture crops under dry-land conditions: a preliminary study
Item type: Journal Article • Journal: South African Journal of Plant and SoilSuppression of the weed silver-leaf bitter apple (Solarium elaeagnifolium Cav.) by three pasture species, under dry-land conditions, was studied in a field trial over four seasons in the Free State Province. The pasture crops used were oats (Avena sativa), smuts... -
SOIL carbon and nitrogen in five contrasting biomes of South Africa exposed to different land uses
Item type: Journal Article • Journal: South African Journal of Plant and SoilStocks of soil C to a depth of 50 cm in untransformed, indigenous veld ranged from 21 t ha-1 in karoo to 168 t ha-1 in thicket and stocks of N ranged from 3.41 ha-1 in karoo to 12.8 t... -
Oviposition site preferences by <em>Helicoverpa armigera</em> (Lepidoptera: Noctuidae): effect of season and density on distribution of eggs on plants
Item type: Journal Article • Journal: South African Journal of Plant and SoilIn an attempt to improve field sampling of the African bollworm, Helicoverpa armigera (Hübner), oviposition behaviour of the pest on tomato plants was investigated. From limited studies conducted in the past, variation in oviposition sites preferences by H. armigera is... -
Recent population trends of African penguins <em>Spheniscus demersus</em> in Namibia
Item type: Journal Article • Journal: South African Journal of Marine ScienceThe African penguin Spheniscus demersus is endemic to southern Africa and is listed overall as "vulnerable". Over the past century, however, the Namibian population has been severely reduced and is currently listed as "critically endangered". Recent trends at Possession, Halifax,...
