Articles by Keyword: Stock Discrimination

Search results for Stock Discrimination

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  1. 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...
  2. Otolith shape as a valuable tool to evaluate the stock structure of swordfish <em>Xiphias gladius</em> in the Indian Ocean

    Otolith shape as a valuable tool to evaluate the stock structure of swordfish <em>Xiphias gladius</em> in the Indian Ocean

    Item type: Journal Article • Journal: African Journal of Marine Science
    Swordfish Xiphias gladius is an oceanic-pelagic species. Its population structure in the Western Indian Ocean was studied from the shape of the sagittal otoliths of 391 individuals collected from 2009 to 2014. Normalised elliptical Fourier descriptors (EFDs) were extracted automatically...
  3. Spatial variation in meristic and morphometric characteristics of sardine <em>Sardinops sagax</em> around the coast of southern Africa

    Spatial variation in meristic and morphometric characteristics of sardine <em>Sardinops sagax</em> around the coast of southern Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Spatial variability in phenotypic characteristics within a fish population may be used to infer the existence of multiple stocks, and knowledge of the population structure of exploited species is important for their sustainable management. In this study we investigated geographic...
  4. A comparison of four different standards of reference for the animal unit for Determining stocking rate

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    No single standard of reference for the animal unit (AU) for determining stocking rates has materialized. Often, therefore, it is not clear which standard of reference for the AU or which method of determining stocking rate has been used in...
  5. Development of Bayesian stock assessment methods for Namibian orange roughy <em>Hoplostethus atlanticus</em>

    Development of Bayesian stock assessment methods for Namibian orange roughy <em>Hoplostethus atlanticus</em>

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Bayesian methods are useful in fisheries stock assessment because they provide a conceptually elegant and statistically rigorous approach to making decisions under uncertainty. The application of Bayesian stock assessment methods in the management of Namibian orange roughy Hoplosthethus atlanticus within...
  6. A review of orange roughy <em>Hoplostethus atlanticus</em> fisheries, estimation methods, biology and stock structure

    A review of orange roughy <em>Hoplostethus atlanticus</em> fisheries, estimation methods, biology and stock structure

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Orange roughy Hoplostethus atlanticus are unusual fish. They form dense aggregations that have fuelled lucrative fisheries at great depths (600–1 400 m), especially off Namibia, New Zealand and Australia. They are thought to be very long-lived (>100 years, maturity at...
  7. A decade of exploitation and management of the Namibian hake stocks

    A decade of exploitation and management of the Namibian hake stocks

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The hake resource is the most important commercial fish species in the demersal sector of Namibia's fisheries, both in terms of annual catch and contribution to Gross Domestic Product (GDP). The fishery now spans four decades. In the 1960s and...
  8. Population dynamics and potential yield of three species of giant winkles in the Western Cape, South Africa

    Population dynamics and potential yield of three species of giant winkles in the Western Cape, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Of the southern African intertidal and shallow subtidal trochid and turbinid gastropods, Turbo sarmaticus, T. cidaris and Oxystele sinensis, are the most abundant large species, and therefore obvious targets for a winkle fishery. T. sarmaticus is harvested by recreational snorkel...
  9. Movement response patterns of livestock to rainfall variability in the Richtersveld National Park

    Movement response patterns of livestock to rainfall variability in the Richtersveld National Park

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    We studied the seasonal and daily movement patterns of livestock (pastoralists) in the Richtersveld National Park to suggest management strategies that would support a balance between biodiversity conservation and livestock grazing. Livestock movement patterns indicated that forage is the motivation...