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Publication Type J
Authors Watanabe, W. O. and R. D. Farnell
Title Experimental Evaluation of the Halophyte, Salicornia virginica, for Biomitigation of Dissolved Nutrients in Effluent from a Recirculating Aquaculture System for Marine Finfish
Source Journal of the World Aquaculture Society
Author Keywords dissolved nitrogen and phosphorus halophyte integrated multitrophic aquaculture marine finfish recirculating aquaculture systems recirculating aquaculture system Salicornia virginica salt-tolerant plants waste-water constructed wetlands fish culture removal mariculture seaweed growth phosphorus future forage
Abstract The ability of the halophyte, Salicornia virginica, planted in drainage lysimeters to biomitigate dissolved nutrients in effluent from a recirculating aquaculture system (RAS) for marine finfish was evaluated. Seawater effluent from a RAS producing black sea bass, Centropristis striata (filtered to reduce total suspended solids), was used as irrigant. Plant growth and dissolved N and P removal were determined as a function of leachate fraction (LF%)-that is, proportion of irrigant that leaches from the plant-substrate lysimeter. Lysimeters were irrigated weekly to produce 30, 40, and 50% LF. A control (unplanted) lysimeter was included at the 30% LF. Plant growth was excellent in all LF% treatments until Day 141 when salt buildup in the lysimeter substrate inhibited nutrient uptake. Salt accumulation was mitigated at higher LF%, so that plant biomass and net removal (g) of dissolved N and P by the p-s lysimeter remained higher (P<0.05) at the 40 and 50% than at the 30% LF. On Day 141, percent removal efficiency at the 50% LF was 79.2% for inorganic N and 73.9% for total phosphorus. Through Day 355, substrate salinity was minimized and plant biomass and nutrient removal were maximized at the 50% LF. S. virginica is an effective biofilter for dissolved nutrients in effluent from an RAS for marine finfish.
Author Address [Watanabe, Wade O.; Farnell, Robert D.] Univ N Carolina, Ctr Marine Sci, Aquaculture Program, 601 S Coll Rd, Wilmington, NC 28403 USA. Watanabe, WO (reprint author), Univ N Carolina, Ctr Marine Sci, Aquaculture Program, 601 S Coll Rd, Wilmington, NC 28403 USA. watanabew@uncw.edu
ISSN 0893-8849
ISBN 0893-8849
29-Character Source Abbreviation J. World Aquacult. Soc.
Publication Date Aug
Year Published 2018
Volume 49
Issue 4
Beginning Page 735-754
Digital Object Identifier (DOI) 10.1111/jwas.12490
Unique Article Identifier WOS:000440844200010
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