https://tede.unioeste.br/handle/tede/603 Thu, 30 Apr 2026 01:24:17 GMT 2026-04-30T01:24:17Z https://tede.unioeste.br/handle/tede/8393 Title: Revisão sistemática a respeito de off-flavors causados por Geosmina e 2-Metilisoborneol (MIB) em produtos aquáticos Autor: Santos, Osvaldo Gois Primeiro orientador: Ballester, Eduardo Luis Cupertino Abstract: This systematic review addresses the issue of sensory quality of freshwater fish farmed by aquaculture. Off-flavors are undesirable flavors and odors in farmed fish that affect the quality and acceptance of the product by the consumer, causing serious financial losses to the production chain. The PRISMA method was used to select articles related to the study theme, where 7,576 documents were analyzed, opting for recent articles, published in the last six years, obtained from the Scopus and Web of Science databases. After applying the exclusion terms (off-flavor, aquaculture, fish, articles, periods, GSM and MIB), forty-four relevant studies were obtained, in which we sought to identify the objectives of the study, the species studied, the farming system, results achieved, gaps and future studies of each investigated article, briefly reporting their objectives and results. Most studies emphasize the influence of water quality, climate issues, management, feed quality, especially the presence of cyanobacteria, algal blooms, fungi, and metabolic compounds such as GSM, MIB, among others, which contribute to the formation of unpleasant flavors and odors. The results highlight the need to improve management practices and control of altered flavors and odors in aquaculture, in addition to suggesting the need for further research to develop more effective and accessible methods. The importance of continuous monitoring of water quality is emphasized to prevent the formation of undesirable flavors. In summary, the review provides a comprehensive overview of undesirable flavors and odors in freshwater fish, identifying gaps in knowledge and proposing directions for future research, essential for the sustainability and quality of aquatic production. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação Fri, 14 Feb 2025 00:00:00 GMT https://tede.unioeste.br/handle/tede/8393 2025-02-14T00:00:00Z https://tede.unioeste.br/handle/tede/8307 Title: Atratividade e palatabilidade da proteína hidrolisada de penas de aves com diferentes níveis de sulfito em rações para alevinos de tilápia do Nilo (Oreochromis niloticus) Autor: Marinho, Ana Rizia Nascimento Primeiro orientador: Signor, Altevir Abstract: The present study aimed to evaluate the attractiveness and palatability of six diets containing different levels of hydrolyzed feather protein, with and without sulfite addition, for Nile tilapia (Oreochromis niloticus) juveniles. The formulations tested were: SFPE (negative control, with 2% feather meal), FPE (positive control, with 2% fish meal), PHP1%S (1% hydrolyzed feather protein without sulfite), PHP2%S (2% hydrolyzed feather protein without sulfite), PHP1%C (1% hydrolyzed feather protein with sulfite), and PHP2%C (2% hydrolyzed feather protein with sulfite). Twelve juveniles (7.38 ± 0.20 g) were distributed in 20-liter aquaria and fed six times per day with 0.1889 g per feeding (35 pellets), following a completely randomized experimental design. Feeding behavior was recorded via video for three minutes during each feeding session, analyzing the following parameters: time to first pellet capture, number of rejections after capture, intake (number of pellets consumed), and time spent feeding. A significant difference was observed at 8:00 h for the attractiveness and palatability index (API) and pellet rejections after capture, while no significant differences were found for the other time points and parameters (p > 0.05). Therefore, it can be concluded that the tested diets exhibit attractiveness and palatability comparable to the control diets and may be considered for inclusion in diets for Nile tilapia. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação Thu, 21 Aug 2025 00:00:00 GMT https://tede.unioeste.br/handle/tede/8307 2025-08-21T00:00:00Z 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 Mon, 03 Nov 2025 00:00:00 GMT https://tede.unioeste.br/handle/tede/8297 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 Fri, 26 Oct 2018 00:00:00 GMT https://tede.unioeste.br/handle/tede/8295 2018-10-26T00:00:00Z