Articles by Author: Jn Kathena

Search results for Jn Kathena

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  1. A robust method for generating separate catch time-series for each of the hake species caught in the Namibian trawl fishery

    A robust method for generating separate catch time-series for each of the hake species caught in the Namibian trawl fishery

    Item type: Journal Article • Journal: African Journal of Marine Science
    Merluccius capensis and M. paradoxus are morphologically very similar and cannot be registered separately by species in the Namibian commercial hake catches. This prevents a biologically plausible single-species stock assessment from being carried out. Here, species-separated data from an observer...
  2. Stock-environment recruitment analysis for Namibian Cape hake <em>Merluccius capensis</em>

    Stock-environment recruitment analysis for Namibian Cape hake <em>Merluccius capensis</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    The factors modulating recruitment success of Cape hake Merluccius capensis in Namibian waters are still unresolved. In this study, we used generalised additive models, regression tree analysis and the conventional Ricker model to examine the effect of environmental indices and...
  3. 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...
  4. Population abundance and seasonal migration patterns indicated by commercial catch-per-unit-effort of hakes (<em>Merluccius capensis</em> and <em><sans-serif>M. paradoxus</sans-serif></em><sans-serif>) in the northern Benguela Current Large Marine Ecosystem</sans-serif>

    Population abundance and seasonal migration patterns indicated by commercial catch-per-unit-effort of hakes (<em>Merluccius capensis</em> and <em><sans-serif>M. paradoxus</sans-serif></em><sans-serif>) in the northern Benguela Current Large Marine Ecosystem</sans-serif>

    Item type: Journal Article • Journal: African Journal of Marine Science
    We developed generalised additive models (GAMs) to estimate standardised time-series of population abundance indices for assessment purposes and to infer ecological and behavioural information on northern Benguela hakes, Merluccius capensis and M. paradoxus, using haul-by-haul commercial trawl catch-rate data as...
  5. Data-moderate assessments of Cape monkfish <em>Lophius vomerinus</em> and west coast sole <em>Austroglossus microlepis</em> in Namibian waters

    Data-moderate assessments of Cape monkfish <em>Lophius vomerinus</em> and west coast sole <em>Austroglossus microlepis</em> in Namibian waters

    Item type: Journal Article • Journal: African Journal of Marine Science
    There is global interest in providing scientific advice on optimal harvesting of all commercially exploited fish stocks. Nevertheless, many commercially important stocks lack analytical assessments. Therefore, we evaluate a data-moderate stock assessment method: the stochastic surplus production model in continuous...