Articles by Keyword: Benguela

Search results for Benguela

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  1. A comparison of condition factor and gonadosomatic index of sardine <em>Sardinops sagax</em> stocks in the northern and southern Benguela upwelling ecosystems, 1984–1999

    A comparison of condition factor and gonadosomatic index of sardine <em>Sardinops sagax</em> stocks in the northern and southern Benguela upwelling ecosystems, 1984–1999

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Time-series of condition factor (CF) and gonadosomatic index (GSI) were generated using general linear models (GLM) for sardine Sardinops sagax stocks in the northern and southern Benguela ecosystems over the period 1984–1999. During this period the biomass of sardine in...
  2. Influence of buoyancy and vertical distribution of sardine <em>Sardinops sagax</em> eggs and larvae on their transport in the northern Benguela ecosystem

    Influence of buoyancy and vertical distribution of sardine <em>Sardinops sagax</em> eggs and larvae on their transport in the northern Benguela ecosystem

    Item type: Journal Article • Journal: South African Journal of Marine Science
    In recent years, sardine Sardinops sagax spawning has been recorded inshore off central Namibia. Field observations on eggs and laboratory measurements show that spawning, demonstrated by the distribution of newly spawned eggs, takes place just below the upper mixed layer...
  3. Changes in abundance of the northern Benguela sardine stock during the decade 1990–2000, with comments on the relative importance of fishing and the environment

    Changes in abundance of the northern Benguela sardine stock during the decade 1990–2000, with comments on the relative importance of fishing and the environment

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The northern Benguela stock of sardine Sardinops sagax used to be considered one of the major clupeoid stocks of the world; it supported an average annual catch of >700 000 tons throughout the 1960s. The stock has been in a...
  4. Identification and classification of vertical chlorophyll patterns in the Benguela upwelling system and Angola-Benguela front using an artificial neural network

    Identification and classification of vertical chlorophyll patterns in the Benguela upwelling system and Angola-Benguela front using an artificial neural network

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Information on the vertical chlorophyll structure in the ocean is important for estimating integrated chlorophyll a and primary production from satellite. For this study, vertical chlorophyll profiles from the Benguela upwelling system and the Angola-Benguela front were collected in winter...
  5. Changes in some key biological parameters of the northern Benguela sardine stock

    Changes in some key biological parameters of the northern Benguela sardine stock

    Item type: Journal Article • Journal: South African Journal of Marine Science
    During the past 50 years, more than 15 million tons of sardine have been harvested from the northern Benguela ecosystem. The sardine population has undergone changes in abundance estimated to range over more than two orders of magnitude, but for...
  6. An overview of the living marine resources of Namibia

    An overview of the living marine resources of Namibia

    Item type: Journal Article • Journal: South African Journal of Marine Science
    This paper gives an overview of the main living marine resources of Namibia. It focuses on the scientific research conducted during the past decade as input to the management of these resources. The distribution and habitats of the most important...
  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. Diet of sardine <em>Sardinops sagax</em> in the southern Benguela upwelling ecosystem

    Diet of sardine <em>Sardinops sagax</em> in the southern Benguela upwelling ecosystem

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The diet of sardine Sardinops sagax in the southern Benguela was investigated by microscopic examination of stomach contents. The relative dietary importance of prey size and prey type was assessed by calculating the carbon content of prey items. Sardine is...
  9. Drift Patterns of Anchovy <em>Engraulis Capensis</em> Larvae in The Southern Benguela, and Their Possible Importance for Recruitment

    Drift Patterns of Anchovy <em>Engraulis Capensis</em> Larvae in The Southern Benguela, and Their Possible Importance for Recruitment

    Item type: Journal Article • Journal: African Journal of Marine Science
    In the southern Benguela, successful recruitment of Cape anchovy Engraulis capensis is highly variable and seems to be dependent on the spawning biomass only to a small extent. This paper investigates how the variations in the drift patterns of larvae...
  10. Observations on the Diel Vertical Distribution of Hydromedusae in the Southern Benguela

    Observations on the Diel Vertical Distribution of Hydromedusae in the Southern Benguela

    Item type: Journal Article • Journal: African Journal of Marine Science
    Diel vertical migration (DVM) of six common species of hydromedusae was investigated during two drogue studies conducted in St Helena Bay on the west coast of South Africa in February 1995. Clytia spp., Obelia spp. and Bougainvillia macloviana, were largely...