TEDE Collection:

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)

Thu, 21 Aug 2025 00:00:00 GMT

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

Efeitos da restrição alimentar e realimentação sobre características intrínsecas de juvenis de pacu (Piaractus mesopotamicus) cultivados em tanques-rede no Reservatório de Itaipu Binacional

Thu, 03 Aug 2023 00:00:00 GMT

Title: Efeitos da restrição alimentar e realimentação sobre características intrínsecas de juvenis de pacu (Piaractus mesopotamicus) cultivados em tanques-rede no Reservatório de Itaipu Binacional Autor: Vieira, Rayana Alves Rodrigues Primeiro orientador: Signor, Arcangelo Augusto Abstract: This research aimed to evaluate the effect of different feeding strategies, of a restrictive nature, on the zootechnical performance of juveniles of the species Piaractus mesopotamicus, the pacu, cultivated in an intensive system of net-tanks. The experiment lasted a total of 120 days, using 400 specimens of the species with an average weight of 154.0±38.3 g, randomly distributed in 20 net-tanks with a useful volume of 0.8 m3, totalizing 20 fish/tank. The adopted feeding practices were: A (daily feeding); B (food from Monday to Friday); C (feeding on alternate days); D (food Monday, Wednesday and Friday); E (two days of feeding and one day without). Extruded commercial feed (33.9% CP; 3.904 kcal/g) was used, provided in a single daily portion, at a rate calculated as a function of body weight, obtained by biometry. It was observed that fish fed daily (A), on alternate days (C) or fed every two days, followed by one without food (E), showed higher final weight, weight gain, specific growth rate, biomass final, and final length, differing (P<0.05) from the other feeding strategies. However, fish fed on Mondays, Wednesdays and Fridays (D) showed better responses of their intrinsic characteristics related to: (%) HDL (186.55), lipids (5.61) and crude protein (19.33), being more adequate and balanced than the other treatments, including those of group (A). These individuals fit into a higher quality group than the others of their species, as specimens were obtained with a lower percentage of fat than the other proposals in the study and this affects their speed of oxidation and deterioration in the post mortem, thus increasing their shelf life, in addition to making it a less caloric food, which consequently makes it more attractive to the consumer. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Avaliação de proteases ácidas e alcalinas para juvenis de tilápia

Fri, 15 Dec 2023 00:00:00 GMT

Title: Avaliação de proteases ácidas e alcalinas para juvenis de tilápia Autor: Nascimento, Jessica Luciane Primeiro orientador: Signor, Altevir Abstract: Nutrition is an essential factor for the development of aquatic organisms, considering that protein is a costly and limiting factor for fish diets. In this context, an alternative is sought to reduce the use of protein in feed. Therefore, the objective of the study was to evaluate the influence of blends of acidic and alkaline proteases FC-TECMAX PRO FC®: on the productive performance of juvenile Nile tilapia. The experiment was conducted at the Aquaculture Studies and Management Group (GEMAq) at UNIOESTE campus Toledo, PR. 400 specimens of Nile tilapia were used, with an average initial weight of 12.57 ± 0.22 g. The animals were distributed in 20 boxes in polyethylene (5 treatments/4 repetitions), totalizing 20 animals per experimental unit and 80 fish per treatment, over a period of 51 days. The diets were formulated with Positive Control (CP) protease inclusion levels: recommended nutritional levels to meet nutritional requirements; Negative control (CN): Depreciated nutritional levels (protease valorization); CN+100; CN+200 and CN+400 of protease. To the Final of experiment were verified you parameters of performance production, fish body indices, analysis of digestive enzyme activity and histology of muscle, liver and intestine. No significant differences were observed in the productive performance of the animals when comparing all treatments, as well as in the bromatological indices of the diets and fish. Regarding enzymatic activity, changes were observed in maltase activity, with the highest activity being 1651.47 (nmol/min/mg of protein) in fish fed with CN + 100 g/t of protease, although it did not contribute to improving production performance. Regarding histological performance, it was observed that CN+200 and CN+400 presented greater height and width of the intestinal villi. In relation to the number of hepatocytes, the best results were found in CP and CN. In this sense, the use of proteases presents in FC-TECMAX PRO FC®: did not contribute to improving the productive performance of juvenile Nile tilapia. The enzymatic variables indicate the need for further studies regarding the metabolism of fish fed with the inclusion of proteases in the diet. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Hidrolisado enzimático de penas de frango em dietas para tilápia do Nilo (Oreochromis niloticus): desempenho produtivo e atratopalatabilidade

Fri, 27 Jun 2025 00:00:00 GMT

Title: Hidrolisado enzimático de penas de frango em dietas para tilápia do Nilo (Oreochromis niloticus): desempenho produtivo e atratopalatabilidade Autor: Figueiredo, Elisiane da Silva Primeiro orientador: Signor, Altevir Abstract: The use of agro-industrial by-products such as viscera, blood, skins, and feathers can be an excellent alternative to fishmeal in aquaculture. This study evaluated the effects of including enzymatically hydrolyzed chicken feathers (HEP), supplied by BRF Ingredients®, in diets for juvenile Nile tilapia (Oreochromis niloticus). The experiments were conducted at the Aquaculture Laboratory of the Aquaculture Management Study Group – GEMAq, at the Western Paraná State University (UNIOESTE), Toledo Campus, Brazil, over a 50-day period for zootechnical performance and 23 days for the attractability and palatability trial.Three isoproteic diets were formulated with 0% (control diet), 1%, and 2% HEP. For productive performance, a completely randomized design was used, with 24 polyethylene tanks and 15 juveniles averaging 9.0 ± 1.0 grams, totaling 360 fish. Feeding occurred four times a day (8 a.m., 11 a.m., 2 p.m., and 5 p.m.). Tank cleaning was performed twice daily, with a partial water exchange of 30%. Dissolved oxygen averaged 4.9 ± 0.5 mg L⁻¹; pH was 7.2 ± 0.01, measured weekly, and temperature was 28.7 ± 0.3°C, measured daily using a multiparameter probe (YSI® Professional Series). Ammonia levels were 0.29 ± 0.05 ppm; nitrite 0.4 ± 0.001 ppm; and soft water hardness were monitored every three days using a LabconTest® colorimetric kit.After the experimental period, zootechnical parameters such as weight gain, specific growth rate (SGR), apparent feed conversion ratio (FCR), hepatosomatic index (HSI), viscerosomatic index (VSI), and carcass proximate composition were analyzed. For the attractability and palatability study, 12 Nile tilapia fingerlings (O. niloticus) with an initial average weight of 7.54 ± 0.39 g and standard and total lengths of 6.18 ± 0.16 cm and 7.73 ± 0.20 cm, respectively, were used. The fish were fed six times a day (8 a.m., 10 a.m., 12 p.m., 2 p.m., 4 p.m., and 6 p.m.). To obtain results, a GoPro® 5 Black 4K Ultra HD camera was used for recording, and attractability-palatability indices (API) were measured based on behavioral parameters such as time to capture the first pellet, number of pellets consumed, rejections, and approaches.Results suggest that the diet containing 2% enzymatically hydrolyzed chicken feathers (HEP) promoted better performance in terms of weight gain and SGR, without negatively affecting physiological indices or carcass composition. Regarding attractability and palatability, positive behavioral responses were observed at specific feeding times, especially for diets containing 1% and 2% HEP, resulting in higher consumption and lower feed rejection. The inclusion of up to 2% HEP proved to be a viable alternative protein source for the formulation of efficient and sustainable diets for tilapia, contributing to the utilization of these agro-industrial by-products in aquaculture. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação