Articles by Author: Cg Attwood

Search results for Cg Attwood

We found 39 results for you
  1. Discrepancy between otolith and tag-recovery estimates of growth for two South African surf-zone teleost species

    Discrepancy between otolith and tag-recovery estimates of growth for two South African surf-zone teleost species

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Growth rates determined from recovered tagged galjoen Dichistius capensis and white steenbras Lithognathus lithognathus were compared to predictions from growth models based on otolith ring counts. Galjoen could not be sexed externally, but it was assumed that all fish >450...
  2. Nearshore surface current patterns in the Tsitsikamma National Park, South Africa

    Nearshore surface current patterns in the Tsitsikamma National Park, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The pattern of surface currents in the Tsitsikamma National Park, South Africa, was studied with holey-sock drogues released in batches of up to four at a time, from 1996 and 1998. Drogues were left to drift for either 6 or...
  3. A simulation model of the sport-fishery for galjoen <em>Coracinus capensis</em>: an evaluation of minimum size limit and closed season

    A simulation model of the sport-fishery for galjoen <em>Coracinus capensis</em>: an evaluation of minimum size limit and closed season

    Item type: Journal Article • Journal: South African Journal of Marine Science
    An age-structured stochastic simulation model is used to evaluate minimum size limit and closed season restrictions in terms of yield, effort and stock size for the sport-fishery for galjoen Coracinus capensis for a projected 15-year period, on the assumption that...
  4. Shore-angling catches in the De Hoop Nature Reserve, South Africa, and further evidence for the protective value of marine reserves

    Shore-angling catches in the De Hoop Nature Reserve, South Africa, and further evidence for the protective value of marine reserves

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Data on the species composition, size, seasonality and capture rates of surf-zone fish sampled by shore-angling at two sites in the De Hoop Marine Reserve are presented. In all, 21 969 fish of 33 species were caught during 11 344...
  5. Teleost catches by three shore-angling clubs in the South-Western Cape, with an assessment of the effect of restrictions applied in 1985

    Teleost catches by three shore-angling clubs in the South-Western Cape, with an assessment of the effect of restrictions applied in 1985

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The species composition, catch rates and size composition of teleost species in catches made between 1938 and 1992 by three shore-angling clubs in the South-Western Cape are described. Numerically, Lithognathus lithognathus (29,45%), Dichistius capensis (24,69%), Diplodus sargus (12,92%), Argyrosomus hololepidotus...
  6. A procedure for setting daily bag limits on the recreational shore-fishery of the South-Western Cape, South Africa

    A procedure for setting daily bag limits on the recreational shore-fishery of the South-Western Cape, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Individual daily catch records are used to devise a method to estimate the fraction of the recreational catch that can be prevented by a daily bag limit (DBL). This fraction is interpreted as a potential reduction of fishing mortality. The...
  7. Modelling the effect of marine reserves on the recreational shore-fishery of the South-Western Cape, South Africa

    Modelling the effect of marine reserves on the recreational shore-fishery of the South-Western Cape, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    A discrete, space-time, age-structured model of a fishery was developed to test the effect of marine reserves on yield of fish to recreational angling. The model was applied to three sympatric surf-zone species commonly targeted by shore-anglers. Movement rates of...
  8. Review of the state of marine protected areas in South Africa

    Review of the state of marine protected areas in South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The use of marine protected areas (MPAs) in South Africa should be revised in the light of growing problems related to the over-use of marine resources. No consistent policy has been applied to the establishment and management of MPAs. Existing...
  9. International experience of marine protected areas and their relevance to South Africa

    International experience of marine protected areas and their relevance to South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Marine protected areas (MPAs) have become necessary to counter modern threats to marine biodiversity and the sustainability of fisheries. Sensitive habitats, including coral reefs, estuaries and mangroves, have been effectively protected in large MPAs, which control resource use. Protection from...
  10. Collapse of linefish stocks between Cape Hangklip and Walker Bay, South Africa

    Collapse of linefish stocks between Cape Hangklip and Walker Bay, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The state of the linefishery between Cape Hangklip and Walker Bay on the Cape south coast, South Africa, is assessed. The coast was subdivided into 20 ?beats? to provide high spatial resolution on catch and effort of the shore-based recreational...