The performance of spray-irrigated Ulva lactuca (Ulvophyceae, Chlorophyta) as a crop and as a biofilter of fishpond effluents

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