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Journal of Applied Phycology

, Volume 17, Issue 6, pp 557–567 | Cite as

Integrated outdoor culture of two estuarine macroalgae as biofilters for dissolved nutrients from Sparus auratus waste waters

  • Ignacio Hernández
  • M. Angeles Fernández-Engo
  • J. Lucas Pérez-Lloréns
  • Juan J. Vergara
Article

Abstract

An integrated outdoor cultivation of two macroalgal species: Ulva rotundata (Chlorophyta) and Gracilariopsis longissima (Rhodophyta) was designed. The macroalgae were cultured in effluents from an intensive marine culture (growout phase) of gilthead seabream Sparus aurata. The biomass evolution of the algal tanks followed a logistic curve, where the approach to the maximum stocking density of seaweeds was governed by thalli self-shading, as nutrient limitation in the cultivation tank was unlikely. The maximum stocking density of the system was approximately 27.8 g U. rotundata L−1 (16.7 Kg m−2) and 11.9 g G. longissima L−1 (7.12 Kg m−2). Yield was more than 3 times higher in U. rotundata than in G. longissima. Overall, U. rotundata removed a greater percentage of phosphate (8.9%) and total dissolved inorganic nitrogen (54%) flowing into the algal tanks than G. longissima. The latter species biofiltered approximately 3.2% of phosphate and 17% of the total dissolved inorganic nitrogen input. However, mean nutrient uptake rates on wet weight basis were usually higher in G. longissima than in U. rotundata. The production of total oxidised nitrogen in the algal tanks, considered as being the nitrification rate occurring on the algal fronds by nitrifying bacteria, was less than half of the ammonium uptake by the macroalgae, suggesting that seaweeds competed efficiently for ammonia against the nitrifyers. The biofiltration during a diel cycle showed that mean phosphate biofiltration was lower than 4.5% in the two species whereas ammonium was biofiltered efficiently (up to 67%), especially in U. rotundata. The metal and heavy metal content in the algal tissue at the end of the monitoring period suggested no metal contamination of tissues so that both macroalgal species could be used in the food industry. The study reveals the value of ecological engineering techniques in reducing the dissolved nutrient content in effluents from the fish farm, with the prospect of a better management practises, based on integrated mariculture designs, being developed by the local farmers.

Keywords

ecological engineering environmental impact Gracilariopsis nitrogen phosphorus Ulva 

Abbreviations:

ToxN

Total Oxidised Nitrogen

DIN

Dissolved Inorganic Nitrogen

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Ignacio Hernández
    • 1
  • M. Angeles Fernández-Engo
    • 1
  • J. Lucas Pérez-Lloréns
    • 1
  • Juan J. Vergara
    • 1
  1. 1.Area de EcologíaUniversidad de Cádiz, Facultad de Ciencias del Mar y AmbientalesCádizSpain

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