Effect of biofilter storage density on the nutrient filtration capacity of Ulva lactuca

• Autor(a) principal: Soares, Ricardo de Oliveira
• Data de Publicação: 2022
• Outros Autores: Castelar, Beatriz, Pontes, Marcelo Duarte
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Research, Society and Development
• Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/26173
• topic: Sistema de Aquicultura Multitrófica Integrada; Macroalga; Agricultura Marinha; Aquicultura sustentável.; Integrated Multitrophic Aquaculture System; Macroalgae; Marine agriculture; Sustainable aquaculture; Sistema Integrado de Acuicultura Multitrófica; Macroalgas; Agricultura marina; Acuicultura sostenible.

This work aimed to evaluate the filtering capacity of inorganic nitrogen and phosphorus by biofilter of the macroalgae Ulva lactuca as a function of stocking density in an AMTI system in water recirculation. The macroalgae were cultivated in 20 experimental units, with 5 stocking densities (2, 4, 6, 8 and 10 kg.m-3) and 4 replications. The concentrations of the nutrients ammonia (N-NH3), nitrite (N-NO2), nitrate (N-NO3) and phosphate (P-PO4) were analyzed at the time of interruption of supply (06:00) and after 12 hours (18:00) for evaluation of nutrient filtration. There were no significant variations (p>0.05) between the values ​​of filtration efficiency of nitrogen (EF-N) and phosphorus (EF-P) and of the filtration rate of nitrogen (TF-N) and phosphorus (TF- P) as a function of stocking density. However, an effect (p<0.05) of stocking density on the filtration index of nitrogen (IF-N) and phosphorus (IF-P) was observed, where the highest indexes were observed for the lowest stocking densities. The macroalgae storage density interferes with the nutrient filtration capacity, where lower storage densities provide greater macroalgae filtration capacity.