Sea lettuce (Ulva ohnoi) cultivation in biofloc technology: growth performance and characterization of bioactive compounds
2023
Jamilly Sousa Rocha | Daniele Santos | Mateus Aranha Martins | Claúdia Marlene Bauer | Marcelo Maraschin | Leila Hayashi | Felipe do Nascimento Vieira
This work evaluated the biofloc technology cultivation of Ulva ohnoi on its growth performance and biocompounds contents. Ulva ohnoi was cultivated under an initial density of 6 g·L-1 for 28 days using water from a biofloc tank which was exchanged daily at a 90% rate. Temperature, salinity, and illuminance were measured daily. Algae growth and their density was adjusted weekly. Results showed an average plant growth of 1.15%·day-1 (49.5 g·week-1). A significant difference was observed when comparing the initial (2.64 ± 0.3%) and final (4.62 ± 0.2%) ulvan concentration, in addition to a protein increase of 30.2%. No statistical differences were found for concentrations of phenolics and chlorophylls. An increase in flavonoids was observed on days 7 and 14 (0.41 ± 0.04; and 0.41 ± 0.07 μg·g-1 of dry weight), as well as a decrease in carotenoids (41.3%). In conclusion, increases in protein and ulvan were observed after Ulva ohnoi was cultivated in bioflocs.
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