Table 2. gives the average monthly oxygen saturation from
April to September for the last year of the monitoring. The
oxygen saturation was measured in the cages and at the 10 m
out of from the cages, every day at 09.00 am at the surface
waters (0.5 m depth). Dissolved oxygen decreased from June
and reached its minimum during September in the cages and
out of the cages. Better oxygen saturation was recorded out of
the cages. The difference between oxygen saturation in the
cages and out of the cages was the highest in August. Low
saturation during the summer (lower than 80 %) had no
influence on farmed fish.