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The same happens to the fish in your
pond but they use water to breathe. They get oxygen
from the water through thier gills.
If the water in you pond is 'sick'.
it has toxins in it.
Your fish will feel unwell, they will sulk with
their fins clamped to thier body, they may jump
because the water is irritating their skin or
in severe cases the toxins can burn into the fishes
skin.
They may gasp at the surface because
they cannot get enough oxygen from the water because
of gill damage.
Your fish may also collect at the
return pipe from your filter where the cleaner
water is returning to the pond, this is because
this is the cleanest water in the pond and the
fish find it easier to draw oxygen from.
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