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  1. Towards a catchability constant for trawl surveys of Namibian hake

    Towards a catchability constant for trawl surveys of Namibian hake

    Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: I. Huse T. Iilende T. Strømme
    A trawl catches only a portion of the fish in its path. The term catchability therefore refers to the fraction of the available fish caught. A method was developed and tested to establish catchability constants for trawl surveys of Namibian...
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  2. Escapement of Cape hakes under the fishing line of the Namibian demersal sampling trawl

    Escapement of Cape hakes under the fishing line of the Namibian demersal sampling trawl

    Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Jørgensen A Engås E Johnsen T Iilende P Kainge P Schneider
    Swept area surveys in Namibian waters provide input data to the stock assessment model. To evaluate the model's predictions, it is important to understand the catch efficiency of sampling trawls. The objective of this study was to establish whether Cape...
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  3. Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density

    Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density

    Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Robinson --- Australian Research Council (ARC) Centre of Excellence for Coral Reef Studies, Australia NAJ Graham --- Australian Research Council (ARC) Centre of Excellence for Coral Reef Studies, Australia A Grüss --- Department of Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Science, USA C Gerry --- Seychelles Fishing Authority, Seychelles J Bijoux --- Seychelles Fishing Authority, Seychelles
    The vulnerability of spawning aggregations to exploitation varies among fisheries as a result of differences in the population-density changes associated with this behaviour. However, vulnerability to fishing is also influenced by technology, environmental factors, and fish and fisher behaviours. Focusing...
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  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 (Merluccius capensis and M. paradoxus) in the northern Benguela Current Large Marine Ecosystem

    Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JN Kathena --- National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources, Namibia D Yemane --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa N Bahamon --- Centre d’Estudis Avançats de Blanes (CEAB – CSIC), Spain T Jansen --- National Institute of Aquatic Resources (DTU Aqua), Denmark
    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...
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