Articles by Author: Tp Fairweather

Search results for Tp Fairweather

We found 8 results for you
  1. Spatial description of hake-directed fishing activity off the west coast of South Africa

    Spatial description of hake-directed fishing activity off the west coast of South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Historically, the two species of Cape hakes Merluccius capensis and M. paradoxus off South Africa were commercially exploited exclusively by demersal trawling. In 1994, hake-directed demersal longline was introduced on an experimental basis, and in 1998 was initiated as a...
  2. Density-dependent changes in reproductive parameters and condition of southern Benguela sardine <em>Sardinops sagax</em>

    Density-dependent changes in reproductive parameters and condition of southern Benguela sardine <em>Sardinops sagax</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    The sardine Sardinops sagax population in the southern Benguela has undergone substantial fluctuations in size over the past 50 years, collapsing from an apparently large population in the 1950s to low levels in the mid-1960s, remaining low for the next...
  3. A knowledge base for management of the capital-intensive fishery for small pelagic fish off South Africa

    A knowledge base for management of the capital-intensive fishery for small pelagic fish off South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    As a contribution to South Africa's move towards an ecosystem approach to fisheries management, this study explores the existence of common perceptions about South Africa's pelagic fishery between resource users and scientists. It represents a collaborative research effort of social...
  4. Indicators of sustainable fishing for South African sardine <em>Sardinops sagax</em> and anchovy <em>Engraulis encrasicolus</em>

    Indicators of sustainable fishing for South African sardine <em>Sardinops sagax</em> and anchovy <em>Engraulis encrasicolus</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    Six indicators were investigated for South African sardine Sardinops sagax and anchovy Engraulis encrasicolus: mean length of catch, length-at-50% maturity, total mortality, exploitation rate, ratio of bycatch, and centre of gravity of commercial catches. Sardine length-at-50% maturity is the most...
  5. Influences of the abundance and distribution of prey on African penguins <em>Spheniscus demersus</em> off western South Africa

    Influences of the abundance and distribution of prey on African penguins <em>Spheniscus demersus</em> off western South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Off South Africa, anchovy Engraulis encrasicolus and sardine Sardinops sagax are the main prey of African penguins Spheniscus demersus. The combined spawner biomass of these fish increased from less than one million t in 1996 to more than nine million...
  6. Implications for seabirds off South Africa of a long-term change in the distribution of sardine

    Implications for seabirds off South Africa of a long-term change in the distribution of sardine

    Item type: Journal Article • Journal: African Journal of Marine Science
    From 1997 to 2005, the distribution of sardine Sardinops sagax, an important prey item for four seabirds off South Africa, shifted 400 km to the south and east, influencing its availability to breeding birds. It became progressively less available to...
  7. Exploring the spatial distribution patterns of South African Cape hakes using generalised additive models

    Exploring the spatial distribution patterns of South African Cape hakes using generalised additive models

    Item type: Journal Article • Journal: African Journal of Marine Science
    We developed delta generalised additive models (GAMs) to predict the spatial distribution of different size classes of South African hakes, Merluccius capensis and M. paradoxus, using demersal trawl survey data and geographical (latitude and longitude) and environmental features (depth, temperature,...
  8. 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...