THE performance of spray-irrigated ulva lactuca (ulvophyceae, chlorophyta) as a crop and as a biofilter of fishpond effluents
2010
Msuya, Flower E. | Neori, Amir
The seaweed Ulva lactuca L. was spray cultured by mariculture effluents in a mattress-like layer, held in air on slanted boards by plastic netting. Air-agitated seaweed suspension tanks were the reference. Growth rate, yield, and ammonia-N removal rate were 11.8% · d⁻¹, 171 g fresh weight (fwt) · m⁻² · d⁻¹, and 5 g N · m⁻² · d⁻¹, respectively, by the spray-cultured U. lactuca, and 16.9% · d⁻¹, 283 g fwt · m⁻² · d⁻¹, and 7 g N · m⁻² · d⁻¹, respectively, by the tank U. lactuca. Biomass protein content was similar in both treatments. Dissolved oxygen in the fishpond effluent water was raised by >3 mg · L⁻¹ and pH by up to half a unit, upon passage through both culture systems. The data suggest that spray-irrigation culture of U. lactuca in this simple green-mattress-like system supplies the seaweed all it needs to grow and biofilter at rates close to those in standard air-agitated tank culture.
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