Abstract
Ulva rigida was cultivated in 7501 tanks at different densities with direct and continuous inflow (at 2, 4, 8 and 12 volumes d−1) of the effluents from a commercial marine fishpond (40 metric tonnes, Tm, of Sparus aurata, water exchange rate of 16 m3 Tm−1) in order to assess the maximum and optimum dissolved inorganic nitrogen (DIN) uptake rate and the annual stability of the ‘Ulva tank biofiltering system’. Maximum yields (40 g DW m−2 d−1) were obtained at a density of 2.5 g FW 1−1 and at a DIN inflow rate of 1.7 g DIN m−2 d−1. Maximum DIN uptake rates were obtained during summer (2.2 g DIN M−2 d−1), and minimum in winter (1.1 g DIN m−2 d−1) with a yearly average DIN uptake rate of 1.77 g DIN m−2 d−1 At yearly average DIN removal efficiency (2.0 g DIN m−2 d−1, if winter period is excluded), 153 m2 of Ulva tank surface would be needed to recover 100% of the DIN produced by 1 Tm of fish.
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Abbreviations
- DIN=:
-
dissolved inorganic nitrogen (NH sup+inf4 + NO sup−inf3 + NO sup−inf2 );
- FW=:
-
fresh weight;
- DW=:
-
dry weight;
- PFD=:
-
photon flux density;
- V=:
-
DIN uptake rate
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del Río, M.J., Ramazanov, Z. & García-Reina, G. Ulva rigida (Ulvales, Chlorophyta) tank culture as biofilters for dissolved inorganic nitrogen from fishpond effluents. Hydrobiologia 326, 61–66 (1996). https://doi.org/10.1007/BF00047787
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DOI: https://doi.org/10.1007/BF00047787