Test of different substrates to Ulva spp spore recruitment

We tested different plastic materials and depths for fixing the spores of the filamentous macroalgae Ulva spp that occurs in the farm's ponds. The objective was to select the best material for the structures and the best cultivation depth. Six different treatments were tested: PVC panel close to the surface, PVC panel 1.2 cm from the surface, PVC panel 3 cm from the surface, PVC panel coated with plastic bag 1.2 cm from the surface, half a PVC pipe, and half a PET bottle. Each treatment had 4 repetitions. The structures were maintained in the supply channel for 30 days. During the test the temperature, salinity, pH, dissolved oxygen (DO), and transparency were monitored, and taken weekly photographic of macroalgae. The harvested macroalgae were weighed to obtain the total mass produced and to calculate the total productivity.