Articles by Keyword: Otoliths

Search results for Otoliths

We found 16 results for you
  1. Age and growth of two populations of West Coast steenbras Lithognathus aureti in Namibian waters, based on otolith readings and mark-recapture data

    Age and growth of two populations of West Coast steenbras Lithognathus aureti in Namibian waters, based on otolith readings and mark-recapture data

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Age and growth of West Coast steenbras Lithognathus aureti, sampled from two separate populations (northern and southern) along Namibia's coast, was determined using sectioned otoliths, and the results were validated using mark-recapture data. For both populations, the special three-parameter Von...
  2. AGE, GROWTH, REPRODUCTION AND MORTALITY OF THE BUTTER-CATFISH <em>EUTROPIUS DEPRESSIROSTRIS</em> (SCHILBEIDAE: PISCES) IN THE LUPHEPHE NWANEDZI IMPOUNDHENT, VENDA (SOUTH AFRICA)

    AGE, GROWTH, REPRODUCTION AND MORTALITY OF THE BUTTER-CATFISH <em>EUTROPIUS DEPRESSIROSTRIS</em> (SCHILBEIDAE: PISCES) IN THE LUPHEPHE NWANEDZI IMPOUNDHENT, VENDA (SOUTH AFRICA)

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Aspects of the biology of Eutropius depressirostris in the Luphephe-Nwanedzi impoundment in north-east Venda (South Africa 30° 25' E, 23° 14' S) have been investigated. The Von Bertalanffy equation
  3. 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...
  4. Validation of growth zone deposition rate in otoliths and scales of flathead mullet <em>Mugil cephalus</em> and freshwater mullet <em>Myxus capensis</em> from fish of known age

    Validation of growth zone deposition rate in otoliths and scales of flathead mullet <em>Mugil cephalus</em> and freshwater mullet <em>Myxus capensis</em> from fish of known age

    Item type: Journal Article • Journal: African Journal of Marine Science
    Flathead mullet Mugil cephalus and freshwater mullet Myxus capensis are important components in South African estuarine fish communities and fisheries, but there is little information on their age and growth or age validation. This study validated the periodicity of growth...
  5. Age estimation, growth rate and size at sexual maturity of tigerfish <em>Hydrocynus vittatus</em> from the Okavango Delta, Botswana

    Age estimation, growth rate and size at sexual maturity of tigerfish <em>Hydrocynus vittatus</em> from the Okavango Delta, Botswana

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The aims of this study were to determine relative age, growth rate and size at maturity of tigerfish in the Okavango Delta as a basis for the development of a fisheries management plan. A total of 206 tigerfish Hydrocynus vittatus,...
  6. Otoliths and vertebrae as potential hard structures for ageing South African yellowfin tuna <em>Thunnus albacares</em>

    Otoliths and vertebrae as potential hard structures for ageing South African yellowfin tuna <em>Thunnus albacares</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    Sagittal otoliths and vertebrae from 46 yellowfin tuna Thunnus albacares (118-175 cm fork length) collected off the west coast of South Africa were assessed for potential usefulness in age estimation. Growth increments were found on both structures. Comparisons of growth...
  7. A morphological description of the sagittal otoliths of two mormyrids, <em>Marcusenius macrolepidotus</em> and <em>Petrocephalus catostoma</em> (Family: Mormyridae)

    A morphological description of the sagittal otoliths of two mormyrids, <em>Marcusenius macrolepidotus</em> and <em>Petrocephalus catostoma</em> (Family: Mormyridae)

    Item type: Journal Article • Journal: African Zoology
    The morphology of the sagittal otoliths of two South African mormyrid fish, Marcusenius macrolepidotus and Petrocephalus catostoma, were studied to determine possible morphological significance. The sagittae of M. macrolepidotus and P. catostoma are kidney-shaped and oblong, respectively. The ventral margin...
  8. Age and growth of the estuarine-dependent sparid <em>Acanthopagrus berda</em> in northern KwaZulu-Natal, South Africa

    Age and growth of the estuarine-dependent sparid <em>Acanthopagrus berda</em> in northern KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: African Zoology
    Ages were estimated for the tropical sparid, Acanthopagrus berda, caught in northern KwaZulu-Natal estuaries. Whole otoliths were used in the age determination. Age estimates were validated by marginal increment analysis and oxytetracycline labelling, which indicated that opaque deposition occurs primarily...
  9. Otoliths <em>versus</em> scales: evaluating the most suitable structure for ageing largemouth bass, <em>Micropterus salmoides</em>, in South Africa

    Otoliths <em>versus</em> scales: evaluating the most suitable structure for ageing largemouth bass, <em>Micropterus salmoides</em>, in South Africa

    Item type: Journal Article • Journal: African Zoology
    The suitability of scales for ageing Micropterus salmoides was determined by comparing the precision of growth zone counts on scales with those obtained from sectioned sagittal otoliths from a sample of 496 fish collected from Wriggleswade and Mankazana Impoundments in...
  10. Insights into the diet of a poorly known species: pygmy killer whale <em>Feresa attenuata</em> from Cape Verde, West Africa

    Insights into the diet of a poorly known species: pygmy killer whale <em>Feresa attenuata</em> from Cape Verde, West Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Despite having a worldwide distribution in tropical waters, knowledge on pygmy killer whales Feresa attenuata, including diet, is poor, with only a few studies carried out to date. The presence of otoliths and beaks in stomachs that have been examined...