Articles by Keyword: Orange River Fishes

Search results for Orange River Fishes

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  1. POST-IMPOUNDMENT TRENDS IN THE FISH POPULATIONS OF THE HENDRIK VERWOERD DAM, SOUTH AFRICA

    POST-IMPOUNDMENT TRENDS IN THE FISH POPULATIONS OF THE HENDRIK VERWOERD DAM, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Fish population changes in the Hendrik Verwoerd Dam are presented as sampled with a series of multifilament gill nets from Spring 1971 to Summer 1977. During this period, species such as Barbus halubi (smallmouth yellowfish), B. kimberleyensis (largemouth yellowfish), Labeo...
  2. RELATIVE FISH POPULATION DENSITY CHANGES IN THE P.K. LE ROUX DAM DURING THE FIRST THREE YEARS AFTER INUNDATION

    RELATIVE FISH POPULATION DENSITY CHANGES IN THE P.K. LE ROUX DAM DURING THE FIRST THREE YEARS AFTER INUNDATION

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Before inundation in September 1976 Barbus holubi and Labeo capensis were the dominant species each making up 46% of the total catch. Immediately after impoundment the relative density of B. holubi increased to 75% while that of L. capensis dropped...
  3. HYDROCHEMISTRY OF THE UPPER ORANGE RIVER CATCHMENT

    HYDROCHEMISTRY OF THE UPPER ORANGE RIVER CATCHMENT

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    A four year pre-impoundment study of the catchment of the Hendrik Verwoerd Dam was conducted. The Orange River was the major source of dissolved chemicals and suspended sediments, while the Caledon River contributed 24 and 30% respectively, and the Kraai...
  4. ADDITIONS TO THE CHECKLIST OF SOUTHERN AFRICAN FRESHWATER FISHES AND A GAZETTEER OF SOUTH-WESTERNANGOLAN COLLECTING LOCALITIES

    ADDITIONS TO THE CHECKLIST OF SOUTHERN AFRICAN FRESHWATER FISHES AND A GAZETTEER OF SOUTH-WESTERNANGOLAN COLLECTING LOCALITIES

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    An additional 13 species of freshwater fishes recorded from south-western Angola, mainly from the Cunene Basin, are added to the checklist of southern African freshwater fishes, including five species of marine origin permanently resident in the fresh water of the...
  5. THE FEEDING HABITS OF MINNOWS OF THE GENUS <em>BARBUS</em> (PISCES, CYPRINIDAE) IN AFRICA, WITH SPECIAL REFERENCE TO <em>BARBUS AIVOPLUS</em> WEBER

    THE FEEDING HABITS OF MINNOWS OF THE GENUS <em>BARBUS</em> (PISCES, CYPRINIDAE) IN AFRICA, WITH SPECIAL REFERENCE TO <em>BARBUS AIVOPLUS</em> WEBER

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    A twelve month study of the feeding biology of the chubbyhead barb, Barbus anoplus, Weber, 1897, from Lake Le Roux on the Orange River is described. B. anoplus taken from the open-water habitat fed mainly on copepods and cladocerans whereas...
  6. FISH POPULATIONS IN THE MIDDLE AND LOWER ORANGE RIVER, WITH SPECIAL REFERENCE TO THE EFFECTS OF STREAM REGULATION

    FISH POPULATIONS IN THE MIDDLE AND LOWER ORANGE RIVER, WITH SPECIAL REFERENCE TO THE EFFECTS OF STREAM REGULATION

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The results of two surveys, in March 1982 and September 1983, on the distribution and status of freshwater fish in the highly regulated section of the Orange River, from the P.K. Le Roux Dam wall to the mouth of the...
  7. DISTRIBUTION AND DIVERSITY OF MKUZE SWAMP FISHES DURING A SUMMER FLOOD

    DISTRIBUTION AND DIVERSITY OF MKUZE SWAMP FISHES DURING A SUMMER FLOOD

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Very little information is available on the fishes of the Mkuze swamps and this paper presents the results of an ichthyofaunal survey conducted in March 1988. The study, which coincided with a major river flood, determined that the fish fauna...
  8. SHORT-TERM IMPACTS OF FORMULATIONS OF <em>BACILLUS THURINGIENSIS</em> VAR. <em>ISRAELENSIS</em> DE BARJAC AND THE ORGANOPHOSPHATE TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA

    SHORT-TERM IMPACTS OF FORMULATIONS OF <em>BACILLUS THURINGIENSIS</em> VAR. <em>ISRAELENSIS</em> DE BARJAC AND THE ORGANOPHOSPHATE TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The impacts of larvicides used in the control of blackflies (Diptera: Simuliidae) on macroinvertebrates in the stones-in-current biotope were assessed during 8 field trials in the middle Orange River, South Africa. Two Bacillus thuringiensis var. israelensis (B.t.i.) products (VectobacR 12AS...
  9. DETRIMENTAL EFFECTS OF FENTHION (QUELETOX® UL), USED TO CONTROL RED-BILLED QUELEA (<em>QUELEA QUELEA</em>), ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE ORANGE RIVER

    DETRIMENTAL EFFECTS OF FENTHION (QUELETOX® UL), USED TO CONTROL RED-BILLED QUELEA (<em>QUELEA QUELEA</em>), ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE ORANGE RIVER

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The relative abundance of rheophilic macroinvertebrates in the Orange River was assessed before and 15 hrs after two aerial applications of fenthion (QUELETOX® UL) above roosting sites of the red-billed quelea (Quelea quelea). The first treatment had no detectable effect...
  10. IMPACTS OF REPEATED APPLICATIONS OF <em>BACILLUS THURINGIENSIS</em> VAR. <em>ISRAELENSIS</em> DE BARJAC AND TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA

    IMPACTS OF REPEATED APPLICATIONS OF <em>BACILLUS THURINGIENSIS</em> VAR. <em>ISRAELENSIS</em> DE BARJAC AND TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The impacts of five consecutive treatments of blackfly larvicides on macroinvertebrates in the middle Orange River were assessed. The abundance of the midge Xenochironomus sp. and the limpet Burnupia sp. was lower at sites treated with Bacillus thuringiensis var. israelensis...