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| Author(s): |
Sara Mello Pinho
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Jaboticabal. 2018-04-13. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal |
| Defense date: | 2018-02-15 |
| Advisor: | Maria Célia Portella; Maurício Gustavo Coelho Emerenciano |
| Abstract | |
The use of biofloc technology in aquaponic production, integrating lettuce production with tilapia nursery, seems to be an alternative to solve the problems related to the supply of juveniles for the grow-out stage, by means of responsible, less environmentally impacting and economically feasible production systems. Besides, consumption of the microbial aggregates present in the biofloc may enable the production of differential juveniles, with desired nutritional conditions. In this sense, this study aimed at evaluating the aquaponic production of tilapia juveniles (~ 1 to 30 g) and lettuce, using biofloc technology. For this purpose, two aquaculture technologies were studied: clear water recirculation (CW, or control) and biofloc (BFT), with three replicates each. The experiment was carried out for 46 days, with two cycles of lettuce production (23 days each) and one cycle of juvenile production. We sought to relate the productive performance data with zootechnical and phytotechnical analyzes; visual characteristics of plants; concentration of nutrients entering and leaving the system; as well as morphological and morphometric analyzes of muscle fibers and centesimal composition of fish. An economic feasibility analysis was also performed, considering four scenarios: two considering the percentage of commercially available lettuce found in the experiment, by the plant quality index (BFT: 37% and CW: 98% of the total) and two others, considering a hypothetical production in which all produced lettuces had good quality to be commercialized. Results showed better productive performance of fish reared in BFT. The data of the growth trajectory in weight, muscle fibers and centesimal composition of fish were similar between CW and BFT. Conversely, for the plants, the treatment CW in the second cycle presented the best phytotechnical and visual results. The economic analysis indicated that the aquaponic production is feasible using both CW and BFT, provided that in BFT a minimum of 63.5% of produced plants are visually suitable for marketing. Generally, the results suggest that the integration BFT with aquaponics may be feasible only through the development of mechanisms that enable reduced accumulation of solids in the roots, thus improving the absorption of nutrients by the plants. (AU) | |
| FAPESP's process: | 16/14966-2 - Nursery of tilapia in aquaponic system using biofloc technology |
| Grantee: | Sara M Pinho |
| Support Opportunities: | Scholarships in Brazil - Master |