In treatment 1 there was
a considerable decrease in DIN after 48 h, with a removal efficiency
of around 40%. After this period an increased concentration
(w4 mmol L1) was observed, likely as a result of the increase in
NH4 concentration. The DIN removal efficiency of G. caudata in
treatment 1 was 17%. In treatment 2 (G. caudataþ Artemia), there
was a marked reduction of this nutrient until the end of the
experiment (w8 mmol L1), resulting in an absorption efficiency of
44.5% (Fig. 4).