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 48 for “"commercial fisheries"”.
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Discarding in UK Commercial Fisheries
… to the sea, is a common feature of European fisheries, and is widely acknowledged as morally wrong. It wastes food and economic resources, and has contributed to overfishing in EU stocks. However, under the current Common Fisheries Policy (CFP), catch that is below minimum landings sizes, …
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Vertical Integration in Commercial Fisheries
… structure under which they operate changes. The commercial fishing industry is a prime example of an industry where property rights have shifted. Due to problems of over-fishing and over-capitalization, economists have championed the conversion of fisheries from common property or open access …
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Entangled Eden: ecological change and the Lake Huron Commercial Fisheries, 1835-1978
… and investigates the causative role of the commercial fisheries in that change. The repeated failures of various regional and international efforts designed to improve management of the lake’s fisheries are also examined. The fundamental argument is that economic considerations were the …
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Trophic relevance of gelatinous zooplankton for commercial fisheries in the Irish Sea
… factor in their inclusion in ecosystem and fisheries models. Using a multidisciplinary approach, this thesis aimed to provide a balanced understanding of the net impact of jellyfish on fish communities in the Irish Sea, and to provide a means for researchers to do the same in marine systems …
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Are Cape Cormorants (Phalacrocorax capensis) losing the competition? Dietary overlap with commercial fisheries
… of competition and overlap between seabirds and fisheries. The Cape Cormorant Phalacrocorax capensis breeds in the Benguela upwelling region of southern Africa. Its population has decreased by over 50% in the three most recent generations resulting in the species being listed as Endangered in the …
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Biometric Assessment of Spotted Seatrout (Cynoscion nebulosus) from Recreational and Commercial Fisheries in Mississippi, USA
… to estimate biostatistical characteristics of fisheries harvests due to lack of sector-specific data. In Chapter 2, I examined the age, length, and sex composition of Spotted Seatrout from three fishery-dependent sectors. Between April and December 2023, I collected 210 fish (n = 19, 124, and …
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Investigating ecosystem-level effects of gillnet bycatch in Lake Erie: implications for commercial fisheries management
… supports one of the world's largest freshwater commercial fisheries. Bycatch has become a concern in current fisheries management. This study focused on four species in Lake Erie that include two major commercial and recreational species, walleye (Sander vitreus) and yellow perch (Perca …
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Assessment of patterns in the Namibian hake fishery based on commercial fisheries data, in relation to environmental factors
This thesis explores the relationships between commercial data and those obtained from research surveys in an attempt to broaden the database available for management, and to cover seasonal and inter-annual changes in density estimates of Cape hake (Merluccius capensis). It also attempts to explain …
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Combining Balanced Score Card and Data Envelopment Analysis for Analyzing the Performance of Small Scale Fisheries
… as Key Performance Indicators (KPIs). In the commercial fisheries sector, sustainable strategy of fisheries organizations can be gained by running the current operations more effectively, and by integrating processes enabling adaptation to change. The efficiency frontier of the DEA model can …
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Estimating Management Uncertainty for Marine Fisheries in the South Atlantic United States
… and the precarious state of many of the nation's fisheries, it has become essential to incorporate uncertainty in the process of setting annual catch limits (ACLs) and annual catch targets (ACTs). The accuracy with which we predict landings can be thought of as management uncertainty, and it can …
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Valuing an ecotourism resource : a case study of the Boulders Beach African penguin colony
… as Endangered due in part to competition with commercial fisheries. Improvements in the spatial management of these fisheries could assist with the conservation of the penguins, but would be costly. Various techniques were used to estimate the value of the colony, and to assess its impact on …
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Examining Movement Dynamics of the Gulf Menhaden Fishery Using an Individual-based Model
… fleet dynamics of one of the more important commercial fisheries in the region and illustrates how they can be simulated using a spatially-explicit IBM</p>
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Aggregate potential of Irish south coast offshore palaeovalleys
… marine based resources such as hydrocarbons and commercial fisheries. Increasing knowledge of the seabed and the processes that cause large scale variation to the morphology and sedimentology is crucial in determining marine aggregate resource potential on the south coast. Qualitative data was …
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Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries
Seabird bycatch in commercial fisheries is one of the major factors causing decreases in many seabird populations. In trawl fisheries, high mortalities have been recorded as a result of seabirds being struck by trawl warps (the cables used to tow the trawl net). Tori (bird-scaring) lines have been …
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Socio-economic impact assessment of permit re-allocations in the South African West Coast Rock Lobster industry
… which incorporates the offshore and nearshore commercial fisheries and the recreational fishery. Small-scale traditional fishermen face access constraints to the fisheries, including lack of skills, limited access to credit and insufficient organisation. Sustainability of both the resource and …
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Cloning and molecular characterisation of four alginate lyase genes from Vibrio midae SY9 : an enteric bacterium from the abalone Haliotis midae
… one alginate lyase enzyme. Haliotis midae is the commercially important abalone species found along the South African coast. Over-fishing and poaching of this species has led to a depletion of the naturally occurring populations and closure of the recreational and commercial fisheries. Abalone …
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Examining the interrelationship between competition law, the allocation of fishing rights, and transformation in South Africa’s fishing industry
… the industry is broadly divided into the commercial sector and the small-scale sector. Most of the commercial fishing takes place in the Western Cape. The HDST fishery and the SMP are the largest commercial fisheries and are the largest contributors to employment figures in the industry. …
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Age, growth, and reproductive biology, of the winter skate, Leucoraja ocellata, in the western Gulf of Maine
… highly susceptible to exploitation by commercial fisheries.</p>
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Investigating Nekton Response to Changing Salinities in the Mississippi Sound: An Experimental and Statistical Approach
… many coastal species and is recognized for its commercial fisheries. Previous freshening events linked to the Bonnet Carré Spillway, a Mississippi River flood diversion structure, proved catastrophic for oyster populations in the Mississippi Sound, but effects on mobile fish and shellfish …
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