The temperature was kept in an optimal range for both rainbow trout and spinach
growth. The Ca2+ and Mg2+ concentration were higher comparing to other studies as Villarroel
et al. (2011), where concentrations of 36.3mg/l for Ca2+ and 6.11mg/l for Mg2+ were reported.
The turbidity values were near to ones registered by Blidariu et al. (2013) who reported a
mean value of 0.98 NTU with a maximum recorded of 1.54 NTU in an aquaponic integrated
system with lettuce (Lactuca sativa) and pikeperch (Sander lucioperca). The percentage value
of BOD5 was similar to the one recorded by Endut (2010) who reported values of BOD5
between 47.3% and 65.5% by growing both African catfish (Clarias gariepinus) and water
spinach (Ipomoea aquatica) in an integrated aquaponic system. Related to rainbow trout
(Oncorhynchus mykiss) growth performance, a total weight gain of 12 440 g for the group fed
with Clasic Extra 1 P–41% brute protein and 14 939 g for the ones fed with Nutra PRO-MPT–50% brute protein was recorded. A final biomass of 52 892 g (25 208 g at the group fed
with Clasic Extra 1 P–41% brute protein and 27 684 g at ones fed with Nutra PRO-MP-T–
50% brute protein) was registered at the end of experiment. The survival rate was 100%.