Articles by Author: Md Durholtz

Search results for Md Durholtz

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  1. Biological characteristics of sardine caught by the beach-seine fishery during the KwaZulu-Natal sardine run

    Biological characteristics of sardine caught by the beach-seine fishery during the KwaZulu-Natal sardine run

    Item type: Journal Article • Journal: African Journal of Marine Science
    Catches of sardine Sardinops sagax made by the beach-seine fishery off the KwaZulu-Natal (KZN) coast during the annual winter sardine run have been sampled intermittently since 1951, and a substantial amount of data on various biological characteristics of sardine caught...
  2. The 2005 KwaZulu-Natal sardine run survey sheds new light on the ecology of small pelagic fish off the east coast of South Africa

    The 2005 KwaZulu-Natal sardine run survey sheds new light on the ecology of small pelagic fish off the east coast of South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Despite much public awareness surrounding the annual migration of sardine Sardinops sagax northward along the east coast of South Africa in winter each year, relatively little research effort has been expended to improve understanding of the ‘sardine run’. For this...
  3. 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,...
  4. Life history of the steentjie <em>Spondyliosoma emarginatum</em> (Cuvier 1830) in Langebaan Lagoon, South Africa

    Life history of the steentjie <em>Spondyliosoma emarginatum</em> (Cuvier 1830) in Langebaan Lagoon, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Morphometric measurements and fin spine and ray counts, external colouration, macroscopic gonad stage and diet were recorded for steentjie Spondyliosoma emarginatum (Pisces: Sparidae) collected from Langebaan Lagoon between August 2004 and September 2005. Sagittal otoliths were removed, and age estimates...
  5. 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...
  6. Age and growth of redeye round herring <em>Etrumeus whiteheadi</em> off the South African coast

    Age and growth of redeye round herring <em>Etrumeus whiteheadi</em> off the South African coast

    Item type: Journal Article • Journal: African Journal of Marine Science
    Ages of redeye round herring Etrumeus whiteheadi were estimated with associated errors and used to infer life-history information, such as age composition, age-at-maturity and instantaneous mortality rate. Samples were collected in November 2005 during a research survey aimed at estimating...
  7. Geostatistical modelling of the spatial life history of post-larval deepwater hake <em>Merluccius paradoxus</em> in the Benguela Current Large Marine Ecosystem

    Geostatistical modelling of the spatial life history of post-larval deepwater hake <em>Merluccius paradoxus</em> in the Benguela Current Large Marine Ecosystem

    Item type: Journal Article • Journal: African Journal of Marine Science
    Optimal and sustainable management of fish resources cannot be ensured without a thorough understanding of the migration patterns and population (demographic stock) structure. Recent studies suggest that these aspects of the economically and ecologically important deepwater hake Merluccius paradoxus are...