Thesis (Ph. D.)--Texas A & M University, 2005. / "Major Subject: Wildlifeand Fisheries Science." Title from author supplied metadata (automated record created on Apr. 14, 2006.). Vita. Abstract. Includes bibliographical references.

Reservoirs throughout the country exhibit degraded shorelines and simplified littoral habitats because of aging. This study evaluated the establishment of agricultural plantings on reservoir mudflats and the effectiveness of supplemental brush pile structures in providing recruitment habitat for juvenile fish. The mudflats of Enid Reservoir, Mississippi were seeded during the winter drawdown in October of 2016 and 2017 with agricultural plantings. Monitoring of plantings found grasses performed best in terms of establishment and providing potential fish habitat. During Summer 2017 brush piles and control sites, without brush, were sampled in Enid Reservoir using rotenone to evaluate juvenile fish use. Juvenile fish exhibited greater abundances and larger sizes, on average, in brush pile sites. Larger brush piles placed in shallower water provided the greatest benefit to juvenile fish.

Channel Catfish are broadly distributed in the U.S. and are important commercially and recreationally in many rivers, lakes, reservoirs, and streams. Since they are a popular sportfish, many state-owned lakes are stocked with a variety of sizes to enhance population sizes and provide angling opportunities. The goals of this study were to determine the contributions of stocked fish, determine the fish size at stocking, and to assess the contribution of yearling and catchable sizes to the stocked percentage. Fish samples were obtained from three hatcheries and six lakes within different ecoregions across Arkansas to assess whether chemical signatures were different among locations. Sectioned pectoral spines were analyzed for Sr:Ca and Ba:Ca using laser ablation-ICPMS to determine whether location-specific Sr:Ca and Ba:Ca signatures were reflected in pectoral spine samples, and to assess the accuracy with which fish could be assigned to their collection location using spine Sr:Ca and Ba:Ca. Fin spine core Sr:Ca and Ba:Ca data were also used to identify stocked fish and determine size at stocking for hatchery-origin fish sampled from each of the six lakes. Spine microchemistry represents a non-lethal approach to identify stocked catfish and infer size at stocking, which will better inform allocation of hatchery-produced fish. Differences in pectoral spine Sr:Ca edge signatures among locations were detected, which were primarily driven by differences in geology among ecoregions. Assignment accuracy of fish to collection location using Random Forest Modeling was 88% or greater for all but one of the study lakes. This allowed for application of the random forest model on pectoral spine core Sr:Ca and Ba:Ca to assign individuals sampled from the lakes as hatchery or wild origin. Among all the Channel Catfish sampled from the six lakes, 45% were identified as hatchery origin and 46% of those were stocked as catchable size fish. Contributions of stocked fish varied among study lakes from 0% to 100%. This was the first study to demonstrate that pectoral spine microchemistry can be used for assessing both stocking contribution and inferring fish size at stocking. Overall, this study will aid in the allocation of hatchery-reared catfish by management biologists, and could lead to more projects focused on exploring stocking contribution by microchemistry, such as assessment of how habitat enhancement may influence the contribution of natural reproduction to catfish populations.

Magister Philosophiae - MPhil / This study outlines human dimensions in the hake sector in South Africa in terms of hake fish workers. The hake fish workers condition of employment, security of employment, social security issues, remunerations and their living conditions forms part of the social, economic and political dimensions in hake fisheries. The need for ensuring sustainable long-term utilisation of the hake resource and to manage, prevent and reduce all adverse effects of harvesting the hake stock through knowledge based intervention is crucial to this study. Sustainable fisheries management can use the working and living conditions of fish workers as indicators for effective management of fisheries. Fish workers issues, which include their conditions of service, contractual agreements, work safety, income, working hours and other human dimensions, may have an effect on the effective sustainable management. Ecosystems approaches takes into consideration the human dimensions and ecological consideration for effective fisheries management. Knowledge of the historical and economic importance of the hake sector is crucial for the planning and future of the fisheries. Applying the concept of the ecosystems approaches to hake fisheries management is also critical in understanding the human dimensions in hake fisheries. The qualitative methodology of field work was used in understanding the human dimensions in commercial hake fisheries. The investigation into the fish workers labour issues and living conditions through a field work highlighted that the labour issues such as type of employment (permanent or casual), conditions of employment (social security, regulated hours of work, good working conditions), stagnation in terms of promotion, remuneration and issues surrounding labour brokers are some of the social issues in the hake sector. The living conditions of fish workers, stagnation and improved remuneration should be attended to in the sector. Fish workers in the hake sector rely on wages for their livelihood. Workers’ participation in decision-making at governance level should be enhanced for effective governance in the fisheries

Samuel Gutestrand Mandarić, Marine Research and Fisheries Management: Swedish Hydrographic Commission 1893–1901, Umeå University: Department of Historical, Philosophical and Religious studies, Master thesis in History of Science and Ideas, 15 credits, Spring semester 2020.The aim of this thesis is to describe the development of the Swedish marine research from a scientific and institutional perspective. The time period studied begins with the establish-ment of the Swedish Hydrographic Commission in 1893 and ends with the government decision to develop the Swedish Hydrographic-Biologic Commission in 1901. The first motive with the thesis is to increase the understanding for the development of the Swedish hydrography as a field of knowledge and science. Additionaly, with the purpose of gaining insight as to how the hydrographic research was organized, to highlight scientific ideas and theories, as well as to account for the questions that aimed to be answered through the conducting of marine research. The second motive with the thesis is, from a societal perspective, to increase the knowledge in for the existing relations between hydrographic research and fisheries management. The purpose of this being to show the significance and influence given to the survey of fish stocks within the field of marine research, as well as to describe the role of scientific knowledge and rationality in the fisheries management.The empirical and theoretical approach of this thesis is based on scientific development being a result of the cooperation between parties both producing and using gained knowledge. Three analytical concepts have been used to unlock the principles of using and producing knowledge; co-production, boundary work and networking. These concepts bring forth different aspects of the studied relation and they are used heuristically, with focus mainly on specific historical events within the field of marine research.The results show that the Scandinavian marine research was developed in the inter-section between establishment of managing an enterprise, the transformation of the hydrographical and biological research, and increasing national and international research cooperations. Societal applications were the prime motive for government approved and financed marine research and its institutional internationalization. The scientific marine and fish stock surveys were part of a commercial and political program with aim to bring reformation to the fisheries. The marine surveys were considered necessary in order for rational fishing to be carried out and they were also important in the development of the fishing industry. The official decision to introduce fisheries management, together with the international council, enabled the establishment of marine research as a branch of know-ledge and research within the field of natural science.

Made available in DSpace on 2014-12-17T14:33:10Z (GMT). No. of bitstreams: 1 MarcioLFR_DISSERT.pdf: 949735 bytes, checksum: 7b0d7914f06ce721cd7df5864b67525c (MD5) Previous issue date: 2014-02-11 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / When scientists study methods, theory and standards in an inseparable form, he is facing a paradigm. Throughout the development of a determined science, paradigms can change by changing the methods, objective and standards of research. Fisheries science is changing the paradigm moving from the paradigm of maximization in the use of resources, quantified by the index of the catch, which was influenced by evolutionary concepts such as Optimal Foraging Theory, to the sustainability paradigm that seeks its foundation in the fishery ecosystem perspective. The goal of this study was to review methods, theory and the history of ecosystem indexes of fishery science that attempts to determine sustainability of fishery resources from the data capture. Ecosystems indexes by themselves may not be useful to measure the sustainability of fishing because they focus only on the environmental or ecological side of the sustainability tripod. Probably to measure the sustainability of fishing these indexes should include in the future the Payments for Ecosystem Services and Social Resilience. Thus the methods and theories are in constantly changing within science to meet the most current paradigm / Quando o cientista enxerga de forma insepar?vel os m?todos, a teoria e as normas ele est? diante de um paradigma. Ao longo do tempo o desenvolvimento de uma determinada ci?ncia o paradigma pode mudar alterando os m?todos, os objetivos e as normas da pesquisa com o passar dos anos. Ci?ncia Pesqueira transitou de paradigma da maximiza??o na utiliza??o dos recursos, quantificada pelo ?ndice da captura, que foi influenciado por conceitos evolutivos como a Teoria do Forrageamento ?timo para um paradigma da sustentabilidade que busca seu alicerce na perspectiva ecossist?mica da pesca. O objetivo desse trabalho foi realizar uma revis?o que aborda m?todos, teoria e o hist?rico dos ?ndices ecossist?micos da ci?ncia pesqueira que tentam determinar a sustentabilidade dos recursos pesqueiros a partir dos dados de captura. Os ?ndices ecossist?micos talvez n?o consiga mensurar a sustentabilidade da pesca por si s?, porque eles abordam apenas o lado ambiental ou ecol?gico do trip? da sustentabilidade. Provavelmente para se mensurar a sustentabilidade da pesca esses ?ndices devem se juntar no futuro com os Pagamentos por Servi?os Ecossist?micos e a Resili?ncia Social. Assim os m?todos e as teorias se agregam e se reformulam constantemente dentro dessa ci?ncia para atender o paradigma mais atual

The Western and Central Pacific Ocean (WCPO) is home to the largest tuna fishery stock in the world. However, Pacific Island members of the Western and Central Pacific Tuna Commission (WCPTC) argue that their share of the economic rent from the tuna catches taken out of the Pacific region is very small, being on average only about 6% of the total net benefit, when compared to the share earned by Distant Water Fishing Nations (DWFNs). Kiribati is one of the Pacific Island Countries (PICs), which relies heavily on its fishery for its economic development and sustainability. Kiribati earns 40% - 50 % of its government revenue from fisheries access fees paid by DWFNs for tuna caught in the the Kiribati EEZ. The Government of Kiribati (GoK) believes that Kiribati could get greater benefit if they develop their own domestic tuna fishery. This study uses Cost-Benefit Analysis (CBA) and SWOT Analysis to investigate whether domestication of the tuna fishery is the right move for Kiribati or not. The CBA reported in this thesis adapted a model developed by Campbell (2004) to investigate and evaluate fisheries policy in Papua New Guinea (PNG). However the model in this thesis is reflective of the situation and case of Kiribati. In analyzing the different options identified in this study, the CBA indicated negative (-) NPV(s) for the medium-sized vessel option and positive (+) NPV(s) for the large-sized vessel option. The SWOT analysis however, complemented the CBA by further investigating the tuna domestication options in the economic, social and business and business environment of Kiribati. The SWOT analysis indicated that the existing situation and business conditions in Kiribati appears to favor the small to medium sized vessel options which are less risky than the large purse seine vessel option.