Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"Hake"”.
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Genomics applied to conservation and traceability of African hake
La merluza es uno de los recursos pesqueros con mayor volumen de capturas en Europa. Debido a su gran importancia comercial y al número de especies dentro del género, las merluzas son vulnerables a ser sustituidas por otras especies en diferentes puntos de la cadena de suministro. Los errores de …
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Dynamic catch-effort models for the southern African hake populations
Ur1til 1984, hake quota rec:·ottrttreridaticms made by the ICSEAF Scie·,.-1tific:· Advisory Cour1c:·il were based ors the prodtlcticn .. , 1trooe1 approach with evaluations made using a continuous eqi.ti l i br-i utrJ approx imat i ors. However, seri 01..1s di screpar1c·ies betwee't"1 mooei. …
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Growth and otolith zone formation of Namibian hake, merluccius capensis
… of commercially important Namibian shallow-water hake, Merluccius capensis, were investigated in relation to their environment. A time series of length-frequency distributions (LFDs) from otoliths collected from fur seal scat samples was used to identify cohorts and calculate the approximate …
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Management procedures for the South African hake resource in the 2000s
The two-species South African hake fishery (deep-water Merluccius paradoxus and shallow-water M. capensis) has been managed using Operational Management Procedures (OMPs) since 1990. This thesis summarises the development of two OMPs: OMP-2007, which was the basis for the 2007 to 2010 Total …
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Redistribution and sustainability : competing imperatives in the South African hake fishery
This paper focuses on the hake fishery and investigates to what extent the fishery has been transformed. It then discusses the institutional structure and incentive schemes in the fishery and evaluates the economic, social, and environmental impacts of quota redistribution.
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Assessment of and management procedures for the hake stocks off southern Africa
The hake fishery off southern Africa is a highly valuable and important fishery in terms of both revenue and local employment. This thesis considers the current assessment and management of the Cape hakes stocks. It commences with a brief review of the biology of the Cape hakes and the history of …
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Assessment of bycatch species in the Namibia Hake directed bottom trawl fishery (1997-2014)
… caught during commercial fishing. The Namibian hake-directed bottom trawl fishery has been an important component of the Namibian fishing industry for decades. Due to the low selectivity of the bottom trawling method, bycatch has been a common feature of this hake-directed fishery. This study …
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Systems modelling of the South African offshore demersal hake trawl fishery : an economic perspective
The offshore demersal hake trawl is the largest sector of the South African hake fishery, which targets shallow-water (Merluccius capensis) and deep-water (M. paradoxus) Cape hakes. Economically, it is the most important fishery in South Africa, generating ZAR ~5 billion in revenue, mainly from …
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Modelling cannibalism and inter-species predation for the Cape hake species Merluccius capensis and M. paradoxus
The hake fishery is South Africa's most valuable and harvests two morphologically similar species, the shallow- water Cape hake Merluccius capensis and the deep-water Cape hake M. paradoxus. Since 1948, annual catches have exceeded 50 000 tons and the current total allowable catch (TAC) is about …
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Stable carbon and nitrogen isotope ratios in the shallow-water cape hake, merluccius capensis (castelnau) as indicators of trophic position and diet on the west and south coasts of South Africa
… the trophic levels of the shallow-water Cape hake, Merluccius capensis (Castelnau) at three sites on the west coast of South Africa, and five sites on the south coast. Gut content analyses show only the very recent diet of hake, therefore stable carbon and nitrogen isotope ratios were used to …
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A preliminary investigation on the relationships between upwelling and commercial hake fishery in the Southern Benguela
The hake bottom trawl division is the largest component of the fishing industry in South Africa and it is one of the strong pillars of the food industry and the national economy. It is the main source of livelihood for many people in the West Coast and as such, finding ways of advancing it towards …
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Technologies, knowledge and capital : towards a political ecology of the Hake Trawl Fishery Walvis Bay, Namibia
Around the world, the implementation of effective fisheries management has been met with a variety of challenges. The incorporation of fisher's local ecological knowledge (FK) into the management paradigm is an important step in understanding perceptions and responses to the changing environment, …
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Establishing a baseline for evaluating changes in fish body condition and population dynamics of Cape hake (Merluccius capensis and M. paradoxus) in South Africa
… capensis) and deep-water (M . paradoxus) Cape hake. The aim was to provide fixed baselines and Wr indices to aid understanding of temporal and spatial variability in fish condition . Baselines were calculated using the empirical percentiles (EmP) method applied to length (L) – weight (W) data …
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Assessment of patterns in the Namibian hake fishery based on commercial fisheries data, in relation to environmental factors
… changes in density estimates of Cape hake (Merluccius capensis). It also attempts to explain hake variability of in terms of environmental indices based on satellite remote sensing, carefully chosen to reflect underlying oceanographic processes. The influence of various factors on …
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Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank
A Geographic Information System (GIS) is used to elucidiate vertical and horizontal patterns of distribution of Merluccius capensis on the inshore south coast (20°-27°E) of South Africa. Catch data used to compare the size distribution in catches made by commercial trawls and longlines off the …
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Effects of cannibalism, maternal age and varying fish selectivity in age structured models of deep water hake populations
An Age Structured Model (ASM) was develop in which dynamic and density-dependent cannibalism was included as a top-down control on a modeled population of M. paradoxus which used spawner biomass and maternal based recruitment. The ASM was used to evaluate the effects cannibalism had on age …
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The effects of escape panels on commercial catches of juvenile hakes (Merluccius spp.) off South Africa
The South African hake fishery has experienced a decline in catches in recent times and juvenile catches now constitute a large portion of the catches. This study was undertaken to test three different juvenile exclusion panels (square mesh, plastic grid and large mesh) in minimizing the volumes of …
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