Table 3 shows daily fluctuation of oxygen content (the
saturation) in the cages and out of them, at various depths
(0m, 5m, 10m) at different time (every three hours started
from 7.00 am till 8.00 pm) during the day (June 7th in the last
year of the monitoring). The lowest values were recorded
early in the morning at all depths - oxygen saturation
occasionally dropped below 75 % (7.00 am in the cages). This
problem was associated with high summer temperature. The
maximum of oxygen saturation was recorded at 4.00 pm. The
table also shows the difference between oxygen saturation in
the cages and out of them. The oxygen saturation rose with the
depth and reached its maximum at 10 m (with exception at
4.00 pm).