(LATO) IN LOWERED SEAWATER pH - Central Visayas Campus ...

a reagent grade Hydrochloric acid of different volumes was added daily to each tank
to obtain the following pH ranges: 2.7 to 3.3, 3.7 to 4.3 and 5.7 to 6.3. A GLX
Explorer pH meter was used to monitor the specified pH ranges.
Figure 1. Planting of C. lentillifera in the tank
The pH ranges were checked again two (2) hours after adjustment to ensure
that the pH was still within the desired ranges (Clark et al., 2009). A tank filled with
20 L of seawater (pH 7.7 – 8.3) was also created which served as control. All of the
tanks were placed strategically to expose it to sunlight.
3.4 Growth Performance
3.4.1 Measurement of the Species’ Growth Rate
The growth performed by the species was determined by measuring its
biomass using a digital weighing scale. The individual species’ weight was recorded
before and after the treatment. The data on the average weight of the samples were
plotted in a graph with the time on the x-axis and biomass on the y-axis. To determine
the growth performance of the species, two points, N1 and N2, which are the
extremes of the linear phase are taken and substituted into the equation below
(Levasseur et al., 1993).
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