Chlorine toxicity

Symptoms

Chlorine elevated >0.5mg/L
Checked with a test kit chlorine levels show at or above 0.5mg/L.
Breathing at surface
Fish stays at surface usually at an inclined angle and breathes or sucks air.
Eyes sunken
Eyes appear sunken into the head of the fish.
Faded colours
Colours of fish look washed out compared to normal.
Gills pale
Instead of a normal bright red colour the gills are very pale in colour.
Loss of balance
Fish keeps falling from its attempted swimming pattern.
Respiration slow
Fish's breathing is obviously slower than normal.

Causes

Excess Chlorine brought about by chlorinated mains supply. All mains water for use with fish should be checked BEFORE use with a Chlorine test kit and if necessary treated before fish are put into the water.

Prognosis

Susceptibility varies among species. Usually more than .5mg/L can give problems to sensitive species. Eliminate Chlorine quickly and most fish will recover, if exposure was not too long.

Treatment

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Pictures

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