Articles by Keyword: Counter Current Migration

Search results for Counter Current Migration

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  1. Long-distance migration of the rock lobster <em>Palinurus delagoae</em> off South Africa and Moçambique

    Long-distance migration of the rock lobster <em>Palinurus delagoae</em> off South Africa and Moçambique

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Long-distance migration patterns of deep-water rock lobster Palinurus delagoae were investigated using tagrecapture data obtained over a period of 6 years (1995–2000). Of 7 654 animals tagged, 363 (4.7%) were recovered from South African and seven (0.1%) from Moçambican waters...
  2. THE INVERTEBRATE FAUNA AND BIOTIC INDEX VALUE OF WATER QUALITY OF THE GREAT BERG RIVER, WESTERN CAPE

    THE INVERTEBRATE FAUNA AND BIOTIC INDEX VALUE OF WATER QUALITY OF THE GREAT BERG RIVER, WESTERN CAPE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The invertebrate fauna was sampled at seven localities in the main stream of the Berg River in 1974. These results are discussed and compared with those of Harrison and Elsworth (1958). The results obtained were also used in applying the...
  3. Observations on the linefish resources of Namibia, 1990?2000, with special reference to West Coast steenbras and silver kob

    Observations on the linefish resources of Namibia, 1990?2000, with special reference to West Coast steenbras and silver kob

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The Namibian linefishery is a multisector fishery, with recreational and commercial sectors targeting overlapping species. Prior to 1990, catch data were recorded for the boat sector, but little research was done on the population dynamics of any of the species...
  4. Fish response to the annual flooding regime in the Kavango River along the Angola/Namibian border

    Fish response to the annual flooding regime in the Kavango River along the Angola/Namibian border

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The results of the first seasonal survey of the fish of the Kavango River flood-plain along the Angola/Namibia border are reported. The river experiences peak flooding from February through June, with the 375-km long floodplain extending up to 5 km...
  5. Dynamics of the pelagic component of Namibian hake stocks

    Dynamics of the pelagic component of Namibian hake stocks

    Item type: Journal Article • Journal: South African Journal of Marine Science
    A study was undertaken to investigate the spatial, diurnal and interannual dynamics of the pelagic component of Namibian hake stocks. Data were derived from trawl surveys conducted on board the R.V. Dr Fridtjof Nansen during the period 1991–1999. In addition...
  6. Life history of white stumpnose <em>Rhabdosargus globiceps</em> (Pisces: Sparidae) off South Africa

    Life history of white stumpnose <em>Rhabdosargus globiceps</em> (Pisces: Sparidae) off South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Fishery-dependent and fishery-independent distribution analyses together reveal four discrete areas of white stumpnose Rhabdosargus globiceps abundance between Port Nolloth and the Kei River off the Cape Province of South Africa: the Western Cape (Saldanha Bay), the South-Western Cape, the Southern...
  7. Genetic and morphological variation of the lanternfish <em>Lampanyctodes hectoris</em> (Myctophiformes: Myctophidae) off southern Africa

    Genetic and morphological variation of the lanternfish <em>Lampanyctodes hectoris</em> (Myctophiformes: Myctophidae) off southern Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Genetic and morphological variation within the southern African population of Lampanyctodes hectoris was analysed. A total of 15 enzymes, encoding 22 isozyme loci, was examined (n = 327); seven were polymorphic. The percentage of polymorphic loci ranged from 13.6 to...
  8. Reproduction, growth and migrations of sei whales <em>Balaenoptera borealis</em> off the west coast of South Africa

    Reproduction, growth and migrations of sei whales <em>Balaenoptera borealis</em> off the west coast of South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Results of the examination of 1 062 sei whales Balaenoptera borealis landed at the whaling station at Donkergat, Saldanha Bay, South Africa, in the 1962 and 1963 whaling seasons are presented. Sei whales were usually encountered off the edge of...
  9. THE HABITATS AND HABITAT PREFERENCES OF <underline>CLARIAS GARIEPINUS</underline> (PISCES: CLARIIDAE) IN A CLEAR COASTAL LAKE (LAKE SIBAYA, SOUTH AFRICA)

    THE HABITATS AND HABITAT PREFERENCES OF <underline>CLARIAS GARIEPINUS</underline> (PISCES: CLARIIDAE) IN A CLEAR COASTAL LAKE (LAKE SIBAYA, SOUTH AFRICA)

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The habitat preferences of the sharptooth catfish, Clarias gariepinus, in a clear coastal lake, Lake Sibaya, are described. Larval and small juvenile catfish inhabit flotsam and the rootstocks of plants in very shallow marginal areas. Larger juveniles inhabit densely-vegetated marginal...
  10. REVERSED VERTICAL MIGRATION OF PLANKTONIC CRUSTACEANS IN A EUTROPHIC LAKE OF HIGH pH

    REVERSED VERTICAL MIGRATION OF PLANKTONIC CRUSTACEANS IN A EUTROPHIC LAKE OF HIGH pH

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Two studies of the diel vertical migration of zooplankton in the hyper-eutrophic Hartbeespoort Dam, revealed that both in summer when the lake was anaerobic below 15 m depth, and in winter, when homogeneous, aerobic conditions existed throughout the water column,...