Similarly, B. thailandensis at the
densities of 100 and 1,000 individuals
caused a decrease in chlorophyll a in the 3
ponds too. Chlorophyll a decreased clearly
during the first 2 days of the experiment,
especially at the density of 1,000 of B. thailandensis that reduced the chlorophyll a
level from pond A by 93.74%. The
chlorophyll a levels of water collected from
ponds B and C were decreased by 86.40%
and 82.04%, respectively. After the second
day of the experiment, the level of
chlorophyll a changed only slightly.