Articles by Keyword: Yield Per Recruit

Search results for Yield Per Recruit

We found 240 results for you
  1. 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...
  2. Management advice for the <em>Diplotaxodon limnothrissa</em> (Teleostei: Cichlidae) resource in the south-east arm of Lake Malawi, based on per-recruit analysis

    Management advice for the <em>Diplotaxodon limnothrissa</em> (Teleostei: Cichlidae) resource in the south-east arm of Lake Malawi, based on per-recruit analysis

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Diplotaxodon limnothrissa is a widely distributed species occurring throughout Lake Malawi and is probably the most abundant cichlid in the pelagic zone of the lake. The species is exploited commercially in the south-east arm of the lake, but since the...
  3. Management of <em>Argyrozona argyrozona</em> (Pisces: Sparidae) in South Africa based on per-recruit models

    Management of <em>Argyrozona argyrozona</em> (Pisces: Sparidae) in South Africa based on per-recruit models

    Item type: Journal Article • Journal: African Journal of Marine Science
    Carpenter Argyrozona argyrozona is an endemic sparid that constitutes an important component of the South African linefishery between Cape Agulhas and Port Alfred, where it exists as two stocks; one on the central Agulhas Bank and the other on the...
  4. Rapid biological assessment of the fishery potential of Xonxa Dam, near Queenstown, South Africa

    Rapid biological assessment of the fishery potential of Xonxa Dam, near Queenstown, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Rapid biological assessments have been proposed as the most cost-effective approach to identify suitable target species and to set initial catch and fishing effort levels for new fisheries. Xonxa Dam, a turbid irrigation dam situated in the White Kei catchment,...
  5. Status of the estuarine-dependent riverbream <em>Acanthopagrus berda</em> (Sparidae) harvested by the multi-sectoral fishery in Kosi Bay, South Africa

    Status of the estuarine-dependent riverbream <em>Acanthopagrus berda</em> (Sparidae) harvested by the multi-sectoral fishery in Kosi Bay, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    A stock assessment was undertaken for the tropical sparid Acanthopagrus berda harvested in the Kosi Bay estuarine system, northern KwaZulu-Natal, South Africa, by a multi-sectoral fishery using traditional traps and gillnets, and recreational angling using rod-and-line. Input parameters used in...
  6. Impact of Wood Quality Assessments on Future Fibre Resources in the Pulp and Paper-making Industry

    Item type: Journal Article • Journal: South African Forestry Journal
    Recent evidence from research in Europe has indicated that individual trees can be sampled for their pulping properties by the removal of small quantities (5–50 g) of wood at about breast height (1,3 m above ground). Work began at Sappi's...
  7. Modelling Diameter and Height Distributions through Dispersion Statistics in Even-aged Pine Plantations

    Item type: Journal Article • Journal: South African Forestry Journal
    Diameter and height distribution recovery, in combination with standlevel projection modelling, is generally used in Southern Africa for predicting growth and yield in even-aged pine plantations. A different approach for modelling diameter and height distributions for five pine species commercially...
  8. The performance of tropical pastures in the drier phase of the Highland sourveld of Natal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Several tropical grasses (Acroceras macrum, Cenchrus ciliaris, Cyndon sp., Digitaria sp. and Pennisetum clandestinum) and legumes (Desmodium uncinatum and Lotononis bainesii) were evaluated at the Kokstad Research Station (Bioclimatic sub‐region 4f of Natal) over a period of seven years. The...
  9. Long term nitrogen and phosphorus application to veld

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The long term effects of a 5N x 3P factorial fertilizer application trial on hay yields, botanical composition and soil properties of veld are presented. Significant increases in hay yields were recorded during most years. There was a strong correlation...
  10. Growth patterns of Italian ryegrass cultivars established in different seasons

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    A comparison is made between various Italian ryegrass cultivars established under irrigation on a well‐drained upland site during the traditional autumn months, with plantings of the same cultivars at other times of the year.