Articles by Author: Jb Mann Lang

Search results for Jb Mann Lang

We found 52 results for you
  1. Growth characteristics in the otoliths of selected South African sparid fish

    Growth characteristics in the otoliths of selected South African sparid fish

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Growth characteristics in the otoliths of several South African sparid fish (Diplodus sorgus copensis, D. cervinus hottentotus, Chrysoblephus laticeps, Cymotoceps nasutus, Pochymetopon grande, Rhobdosargus holulbi and Sparodon durbonensis) were investigated. The micro-incremental pattern of deposition in the otoliths conformed to...
  2. An evaluation of participation in and management of the South African spearfishery

    An evaluation of participation in and management of the South African spearfishery

    Item type: Journal Article • Journal: South African Journal of Marine Science
    An evaluation of participation and management of the South African spearfishery was undertaken by analysing spearfishing catch and effort data stored on the National Marine Linefish System (NMLS) and by conducting a creel and questionnaire survey. Results indicated that the...
  3. Long-term trends in catch and effort in the KwaZulu-Natal nearshore linefisheries

    Long-term trends in catch and effort in the KwaZulu-Natal nearshore linefisheries

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The boat-based linefishery is the most important marine fishery along the coast of KwaZulu-Natal, producing 40% of the total annual mass of fish landed there. Since 1900, the fishery has supported commercial and recreational sectors that compete for more than...
  4. Changes in recreational shore anglers’ attitudes towards, and awareness of, linefish management along the KwaZulu-Natal coast, South Africa

    Changes in recreational shore anglers’ attitudes towards, and awareness of, linefish management along the KwaZulu-Natal coast, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Management of recreational fisheries cannot be based on biological and stock assessment data alone but needs to include appropriate social aspects (including knowledge, attitudes and behaviour) of anglers within the fishery. The primary purpose of this study was to evaluate...
  5. Problems in implementing improved range management on common lands in Africa: An Australian perspective

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Rangeland/livestock development in Africa is reviewed and lessons learnt from successes and failures are noted. Pastoral communities have developed risk aversion strategies to survive in the harsh environment and fragile ecology of rangeland areas. With advances in infrastructure (transport, water...
  6. Effect of the amount of surface maize residue on infiltration and soil loss from a clay loam soil

    Effect of the amount of surface maize residue on infiltration and soil loss from a clay loam soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Six levels of maize stover, expressed as percentage ground cover (0–75%) were compared under a rainfall simulator to assess the effect of surface residues on infiltration and soil loss on a clay loam soil with a 3,5% slope. Increasing the...
  7. The effect of tillage system on lodging in maize resulting from a severe rainstorm

    The effect of tillage system on lodging in maize resulting from a severe rainstorm

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Severe lodging in maize lands on Cedara on the 24 February 1985 was caused by a rainstorm registering Force 10 on the Beaufort scale. Large differences in lodging existed between plots in three tillage trials. In two identical primary tillage...
  8. The effect of tillage system and rate and time of nitrogen application on maize performance on a sandy Avalon soil

    The effect of tillage system and rate and time of nitrogen application on maize performance on a sandy Avalon soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four nitrogen fertilizer regimes were superimposed on a tillage trial on a sandy Avalon soil at Dundee in 1985 in order to investigate whether the rate and time of N fertilizer application influenced the poor early-season growth and reduced yields...
  9. Changes in a Doveton clay loam after 12 years of direct-drill maize production

    Changes in a Doveton clay loam after 12 years of direct-drill maize production

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    After 8 years of direct-drill maize production at Cedara on a Hutton/Doveton clay loam (Typic Plinthustult) it was found that the top 120-mm layer had become somewhat denser and that organic carbon levels in the top 20 mm were higher...
  10. An assessment of the recreational fishery in the St Lucia estuarine system, KwaZulu-Natal, South Africa

    An assessment of the recreational fishery in the St Lucia estuarine system, KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    St Lucia is one of the largest estuarine systems in Africa, and attracts thousands of anglers each year. Catchcard data from the National Marine Linefish System for the years 1986–1999 were analysed to determine catch composition, catch per unit effort...