Articles by Keyword: Otolith Ageing

Search results for Otolith Ageing

We found 18 results for you
  1. Age and growth of narrow-barred Spanish mackerel <em>Scomberomorus commerson</em> in the coastal waters of southern Mozambique and KwaZulu-Natal, South Africa

    Age and growth of narrow-barred Spanish mackerel <em>Scomberomorus commerson</em> in the coastal waters of southern Mozambique and KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    The narrow-barred Spanish mackerel Scomberomorus commerson is one of the most important linefish species caught in KwaZulu-Natal and southern Mozambique waters, forming the basis of important commercial, artisanal and recreational fisheries. A total of 439 S. commerson were sampled along...
  2. Predicting seedling emergence of cabbage and onion using vigour tests

    Predicting seedling emergence of cabbage and onion using vigour tests

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Predicting seedling emergence using standard and non-standard germination temperatures, standard accelerated ageing (AA) and saturated salt accelerated ageing (SSAA) tests, were investigated. Germinations were performed at temperatures of 10°, 20°, 20°/30° and 30°C for cabbage (Brassica oleracea var. capitata L.)...
  3. A COMPARISON OF DIFFERENT METHODS OF AGE DETERMINATION IN THE SHARPTOOTH CATFISH <em>CLARIAS GARIEPINUS</em>

    A COMPARISON OF DIFFERENT METHODS OF AGE DETERMINATION IN THE SHARPTOOTH CATFISH <em>CLARIAS GARIEPINUS</em>

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Growth of the sharptooth catfish Clarias gariepinus from four southern African impoundments was estimated by back-calculating age from vertebrae and spines. Length frequency analysis supported the growth estimates derived from vertebrae but not those from spines.- Spines under-estimated the age...
  4. Sexuality among the elderly in Dzivaresekwa district of Harare: the challenge of information, education and communication campaigns in support of an HIV/AIDS response

    Sexuality among the elderly in Dzivaresekwa district of Harare: the challenge of information, education and communication campaigns in support of an HIV/AIDS response

    Item type: Journal Article • Journal: African Journal of AIDS Research
    This ethnographic study in Dzivaresekwa district, Harare, Zimbabwe, examines the issue of sexuality among the elderly and their challenges in accessing information, education, and communication (IEC) campaigns in the face of HIV and AIDS. The research depended heavily on collecting...
  5. Older people living with HIV in Uganda: understanding their experience and needs

    Older people living with HIV in Uganda: understanding their experience and needs

    Item type: Journal Article • Journal: African Journal of AIDS Research
    Older adults ageing with HIV in Africa have been largely neglected, despite the distinctive healthcare needs of this population. This article examines the medical care experiences of older Ugandans living with HIV. Data were collected from 40 HIV-positive adults, aged...
  6. Age, growth rate and size at sexual maturity of <em>Labeobarbus aeneus</em> (Teleostei: Cyprinidae) in the middle Vaal River, South Africa

    Age, growth rate and size at sexual maturity of <em>Labeobarbus aeneus</em> (Teleostei: Cyprinidae) in the middle Vaal River, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Age structure, growth and size at sexual maturity of smallmouth yellowfish, Labeobarbus aeneus (Burchell), were assessed in 2008–2009. Despite its angling and food importance, little has been published on many aspects of its ecology and biology, specifically its age structure...
  7. Breeding biology and nestling development of the Grasshopper Buzzard

    Breeding biology and nestling development of the Grasshopper Buzzard

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Research into the effect of environmental variables on reproductive success of tropical raptors is often constrained by the lack of information on breeding biology. We provide the first detailed information of the breeding biology and nestling development of the Grasshopper...
  8. Do dart tags suppress growth of dusky kob <em>Argyrosomus japonicus</em>?

    Do dart tags suppress growth of dusky kob <em>Argyrosomus japonicus</em>?

    Item type: Journal Article • Journal: African Journal of Marine Science
    Growth rates of dusky kob Argyrosomus japonicus calculated from mark-recapture and otolith-reading methods were compared. Mark-recapture data showed that A. japonicus are resident in an area between the Breede River Estuary and Cape Agulhas on the south-east coast of South...
  9. The effects of ageing biases on stock assessment and management advice: a case study on Namibian horse mackerel

    The effects of ageing biases on stock assessment and management advice: a case study on Namibian horse mackerel

    Item type: Journal Article • Journal: African Journal of Marine Science
    We explore the influence of age-estimation errors on the results of the age-structured production model (ASPM) used for horse mackerel stock assessment in Namibia for the period 1961–2003. The analysis considered age data from eight readers collected during an otolith-reading...
  10. Growth rates of alien <em>Oreochromis niloticus</em> and indigenous <em>Oreochromis mortimeri</em> in Lake Kariba, Zimbabwe

    Growth rates of alien <em>Oreochromis niloticus</em> and indigenous <em>Oreochromis mortimeri</em> in Lake Kariba, Zimbabwe

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Growth rates of indigenous Oreochromis mortimeri and alien Oreochromis niloticus from Lake Kariba were estimated from samples collected in 1997–2000, 2003–2005 and 2010–2011. Growth zones on scales and otoliths of O. niloticus and on the otoliths and opercula of O...