Gracilarioid algae (Rhodophyta) cultured in eutrophic synthetic seawater: potential for growth and preliminary bioremediation assessment

Autor(es)

Cohen, F. P. A. ; Faria, A. V. F. ; Braga, E. S. ; Chiozzini, V. G. ; Plastino, E. M.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF APPLIED PHYCOLOGY; v. 34, n. 6, p. 9-pg., 2022-04-08.

Resumo

Using synthetic seawater is an opportunity to turn marine aquaculture toward more independence from coastal areas and natural seawater. Although synthetic seawater can increase production costs, it is a reality for some marine ornamental aquaculture producers and aquarium operators. For example, the capacity of macroalgae to absorb dissolved inorganic nutrients is a desirable feature when using these plants in integrated multitrophic aquaculture systems. Thus, our aim was to evaluate the potential of culturing three distinct gracilarioid algae, Gracilaria caudata, Gracilaria domingensis, and Gracilariopsis tenuifrons, in eutrophic synthetic seawater collected from a running commercial clownfish aquaculture system. We also provide a preliminary assessment of their capacity to bioremediate inorganic nitrogen and phosphate under the same conditions. The experiment was carried out for 21 days, and all seaweeds grew and remained healthy. Gp. tenuifrons showed higher mean (+/- SD) growth rate (11.2 +/- 1.1% day(-1)), followed by G. caudata (7.8 +/- 0.6% day(-1)) and G. domingensis (4.6 +/- 0.2% day(-1)). Gracilaria caudata and Gp. tenuifrons showed higher absorption (P < 0.05) of ammonium and phosphate, with a mean reduction of 92.1% of NH4+-N and 3.4% of PO4-P. While all three species could be cultured in eutrophic synthetic seawater and take up ammonium and phosphate, Gp. tenuifrons showed the best growth and both Gp. tenuifrons and G. caudata showed better potential to bioremediate nutrients in these conditions. (AU)

• Processo FAPESP: 17/13983-3 - Estudos populacionais em Gracilariopsis tenuifrons (Gracilariales, Rhodophyta): aspectos fisiológicos e moleculares
• Beneficiário: André Vinicius Fonseca de Faria
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/09269-9 - Viabilidade técnica e econômica da produção de macroalgas vermelhas em sistemas integrados com peixes ornamentais em centros urbanos
• Beneficiário: Felipe Pereira de Almeida Cohen
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado