https://tede.unioeste.br/handle/tede/606 2026-06-12T21:34:51Z https://tede.unioeste.br/handle/tede/8449 Title: Socioeconomia e qualidade de vida dos pescadores profissionais do entorno do Parque Nacional de Ilha Grande MS/PR, Brasil Autor: Yunes, Rosinara Virginia Ferreira Primeiro orientador: Kashiwaqui, Elaine Antoniassi Luiz Abstract: This research investigates the socioeconomic conditions and quality of life of professional fishers operating in the surroundings of Ilha Grande National Park, located in the Upper Paraná River Basin, a region marked by profound environmental transformations resulting from river damming and the establishment of protected areas. Developed in a multipaper format, the dissertation articulates two complementary empirical studies based on interviews with 59 professional fishers, combining descriptive analysis, content analysis, and multidimensional perceptual assessment. The first study characterizes the socioeconomic and productive profile of these fishers, highlighting the aging of the category, low educational attainment, economic dependence on fishing, declining income, and changes in fish composition associated with historical damming processes along the Paraná River. The second study deepens this analysis by evaluating fishers’ quality of life across economic, social, and environmental dimensions, comparing the fishers’ own perceptions with assessments of institutional governance. The findings reveal significant divergences between these rationalities, indicating that quality of life cannot be understood through isolated or exclusively institutional indicators, but rather as a multidimensional construct shaped by environmental, economic, and social factors, as well as by traditional fishing knowledge. By shedding light on tensions between environmental conservation, public policies, and traditional ways of life, this research contributes to the debate on professional fishing in protected areas and to the formulation of management strategies that are more responsive to the social realities of fishing communities. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Tese 2026-03-09T00:00:00Z https://tede.unioeste.br/handle/tede/8297 Title: Análise da viabilidade técnico econômica na criação de tambaqui (Colossoma macropomum) em tanques escavados em Rondônia, Brasil Autor: Silva, Ricardo Cezar Alves Vieira da Primeiro orientador: Signor, Altevir Abstract: Aquaculture has emerged as one of the most dynamic agro-productive activities worldwide, contributing to food security, income generation, and regional development. In Brazil, fish farming has gained increasing importance, with tambaqui (Colossoma macropomum) standing out as the main native species cultivated, especially in the Amazon region. The present study aimed to analyze the technical and economic feasibility of tambaqui farming in earthen ponds in the state of Rondônia, evaluating productive and financial performance indicators, as well as comparing management strategies, with emphasis on partial harvesting. For this purpose, the research was conducted on a fish farm of 125.2 hectares, located in Cujubim (RO), consisting of 34 grow-out ponds and 11 nursery ponds. Data collected between 2018 and 2022 were analyzed, including production costs, feed prices, revenues, and zootechnical indicators. The economic analyses included the calculation of Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period, Gross Margin, Profitability Index, and Break-even Point, complemented by sensitivity simulations. The results showed that the initial investment was R$ 7,499,693.43, with an annual operating cost of R$ 6,219,530.54. Feed accounted for 82.4% of total costs. The average productivity reached 7,223.99 kg/ha/year, with a gross margin of 9.10% and profitability of 8.33%. The financial analysis indicated a negative NPV (-R$ 30,337,583.19) and an IRR of -6.11% for a minimum attractive rate of 10%, demonstrating economic unfeasibility under current conditions. However, the sensitivity analysis showed that a 10% increase in fish selling price (R$ 8.83/kg) would result in a positive NPV of R$ 18,814,111.43 and an IRR of 17.26%, making the activity economically viable. In the comparative study between management strategies, partial harvesting showed higher productivity (10,474.34 kg/ha) but higher costs and lower profitability (1.81%) compared to total harvesting (13.88%), which proved to be more economically efficient. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Tese 2025-11-03T00:00:00Z https://tede.unioeste.br/handle/tede/8295 Title: Influência do barramento de um rio neotropical sobre as comunidades de peixes, zooplâncton e a qualidade da água Autor: Orsi, Carlos Henrique Primeiro orientador: Baumgartner, Gilmar Abstract: Damming for purposes of electric energy production have been explored for several decades, with the rivers of the Neotropical region being very affected by such projects. In this study, we intend to evaluate the influence of damming Cantu river on fish and zooplankton communities and on the physical, chemical and biological characteristics of water quality, as well as to verify the relationship between communities and water quality before and after damming. The results showed that, after damming, fish and zooplankton communities were restructured, and that the parameters evaluated for water quality also showed differences and influence on the communities. The most influential characteristics were water temperature, transparency, turbidity and chlorophyll-a concentration. Therefore, we conclude that comparative studies between periods (pre and post damming) for reservoir formation purposes should be maintained to identify such changes and to promote mitigation measures to the impacts. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Tese 2018-10-26T00:00:00Z https://tede.unioeste.br/handle/tede/8264 Title: Diluentes contendo extratos vegetais para a criopreservação de sêmen de jundiá (Rhamdia quelen) Autor: Pedreira, Ahiana Cassia de Oliveira Primeiro orientador: Bombardelli, Robie Allan Abstract: The aim of the present study was to maximize the use of cryopreserved semen of the species Rhamdia quelen collected from the reproductive peak and outside the breeding season, using different extracts of Eichornia crassipes and curcumin in the diluting solution, in order to assess the viability and yield of cryopreserved sperm. Thirty males (130.00 ± 3.47g) were used in the first trial and 20 males (153 ± 0.04g) in the second trial. The induced semen was collected, evaluated and homogenized to form composite samples. Then the semen was diluted in a solution containing 5% fructose, 5% powdered milk, 10% methanol, in the same diluent five different extracts were added: 0.75% ERA = aqueous root extract, 0.5% EAA = aerial aqueous extract, 0.5% EAFP = aqueous polar fraction extract (first test). The same procedure was applied in the second trial using 1% and 1.5% ERH = hydromethanolic extract of the root; 0.75% and 1% ERA = aqueous root extract; 0.5% and 1% ERAq = heated root extract; 1.25% and 1.5% EAH = aerial hydromethanolic extract; 0.5% and 1% EAA = aerial aqueous extract; 0.5% and 1% EAAq = heated aerial extract. After 30 days, the semen was thawed to evaluate the sperm movement, sperm quality, biochemistry and cryopreserved sperm yield. For fertilization, 20 females of R. quelen (191.00 ± 0.05g) were used in the first trial and 25 females (202.00 ± 0.09g) in the second trial. Then, the females were induced to ovulate and the oocytes were collected and fertilized using cryopreserved semen with the respective diluents. Fertilization, hatching and larval normality rates were evaluated. Diluents containing E. crassipes extracts improved (p <0.05) motility compared to the standard diluent in the two trials. They also improved (p <0.05) membrane morphology and integrity, using extracts of E. crassipes and curcumin. In the second trial, there was a reduction in lipid peroxidation using E. crassipes extracts. The effective yield and the effective dose were also improved with the use of E. crassipes extracts. Therefore, it is concluded that diluents containing extracts of E. crassipes and curcumin guarantee protection of sperm during cryopreservation, increase cell viability. In addition to improving semen yield outside the breeding season. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Tese 2021-03-05T00:00:00Z