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 14 of 14 for “"maximum sustainable yield"”.
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Modelling the effect of alternative management strategies on the catch and effort in the carpenter (Argyrozona argyrozona) linefishery
… less than half of the effort that produces a maximum sustainable yield, carpenter stocks were still found below the biomass found at the maximum sustainable yield. In order to explore three different management strategies for the carpenter stock on the offshore Central Agulhas Bank, an …
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Influence of the Estimator Selection in Scalloped Hammerhead Shark Stock Assessment
… FMSY , fishing levels that would sustain maximum yield; and NMSY, abundance at maximum sustainable yield). Furthermore, we considered multi-levelpriors due to the variety of results on the population growth rate of this species. Our research showed that estimator selection influences the …
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Discrete and dynamic population models with logistic growth rate
… a novel technique is applied to obtain the maximum sustainable yield of a harvested single population with logistic growth. This powerful tool serves as a foundation for the analysis of the exploitation of the discrete population model. The Beverton-Holt population model including harvesting …
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Using Management Strategy Evaluation to address problems arising as a result of competing users of the South African horse mackerel resource
… resource) are fitted to those data using the maximum-likelihood estimation method, and are used to provide assessments. Estimates of the current status of the stock indicate that it is healthy, putting it well above its Maximum Sustainable Yield (MSY) level. For the directed midwater fishery, …
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Forests, Beetles, and Climates in British Columbia's Central Interior: Historical Geographies of Paradigm Change in Forest Science and Management, 1945 - Present
… WWII is characterized by three paradigms: (1) maximum sustainable yield forestry; (2) ecosystem-based management; and (3) an in-the-making management regime in the era of anthropogenic climate change. I document how different scientific models have been used to legitimate sustainable management …
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The Portfolio Analysis for Multi-species Fisheries Management in New Zealand: An Application in a Fishing Firm
… single species approach where policy is aimed at maximum sustainable yield. However, with the development of harvesting technology and increased competition to access stocks, the single species approach has been found incapable of dealing with problems of severe depletion of fish stocks. Studies …
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Unlocking the potential of remote sensing for kelp biomass estimation in South African Kelp Concession Areas
… estimates, ensuring the implementation of sustainable harvesting. However, definitive research on the potential of HRI in this application is lacking in the current literature. An accurate estimation of kelp biomass is crucial to calculate maximum sustainable yield (MSY) in South African …
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Investigating single and multiple species fisheries management: stock status evaluation of hammerhead (Sphyrna spp.) sharks in the western North Atlantic Ocean and Gulf of Mexico
… (below population size associated with maximum sustainable yield (MSY)), and overfishing (fishing level above that associated with MSY) occurred in 2005. We found that scalloped hammerhead shark population recovery is likely to occur within 10 years if catch remains at or below 2005 …
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An improved mixed-error non-equilibrium stock-production model and its application to some Brazilian fish stocks
… Data series with low and medium levels of noise yielded consistent results irrespective of the level of exploitation, whereas very noisy data series did not provide reliable results.<br/>For comparison, data from a previously analysed stock was also tested with POEEM and resulted in peculiar …
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Ecology, conservation and management of the black lechwe (Kobus leche smithemani) in the Bangweulu Basin, Zambia
… of the flood-plain where it occurs and its maximum sustainable yield. The study also estimated its potential sustainable off-take and looked into the links that exists between wildlife and socio-economics in order to demonstrate the views of local people on current wildlife management and …
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Water Demand in the Residential and Tourism Sectors: Evidence and Implications for Efficient Management
… with aquifer withdrawals potentially exceeding maximum sustainable yield, may result in a reduction of freshwater quantity and quality. The status of water availability on O'ahu is thus precarious. There is a vigorous effort to quantify the availability of fresh water and estimate the effects of …
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Marine alien species of South Africa : threats and opportunities
… biomass-based fisheries model predicted monthly Maximum sustainable yield (MSY) estimates of 1 560 kg per 100 m of shore in March-April and September-October, but two orders of magnitude less (15 kg) during the remaining months. These peaks correspond to spawning periods of this mussel along the …
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The making of an American ichthyological empire: how the structure of perpetual exploitation of Bristol Bay salmon developed in southwest Alaska, 1883-1970s
This dissertation studies the historical development of salmon fisheries in Bristol Bay off southwest Alaska from the pre-contact era to the 1970s. More specifically, it examines how Anglo- Americans constructed and maintained vibrant salmon fisheries in Bristol Bay during the period. This project …
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The value of catch statistics and records of Guano Harvests for managing certain South African Fisheries
… models for making useful predictions. A maximum likelihood estimation approach to Virtual Population ·Analysis ( VPAl is adopted, developed, and implemented. It is shown from results obtained using artificial fisheries data that the database conventionally considered adequate for VPA …