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Changes in Fish Color
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Symptoms
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Cause
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Treatment and Links
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A). The fish's colors fade, they appear
light |
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Is the lighting too bright? |
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Provide shady spots in the aquarium. |
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Is the chemical composition of the water
suitable for the fish? Could the pH be wrong? |
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Do a partial water change and monitor the pH
with a chemical test kit or a
pH pen. |
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Was any medication, fertilizer or other
substance added to the water? |
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Observe the fish, change the water if their
condition deteriorates. |
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Have the fish been fed strictly with the same
feed for long periods? Is the food old or stale? |
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This can lead to deficiency symptoms, try to
vary the diet as much as possible. |
The coloration of
a fish often reflects it's state of health. Pay attention
to hygiene, water quality and diet. |
B). The mouth parts of one or more
fish take on a color ranging from reddish to deep red |
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These are harmless hemorrhages that often occur
after intensive cleaning of the spawning site or after mouth
fights. |
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Normally, no treatment is necessary. In
severe cases, isolate the fish in a quarantine tank and treat
with
Methylene Blue
or
Forma-Green. |
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C). Does the whole body turn black? |
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The fish may have a thyroid tumor |
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See Physical
Changes page, Part B). |
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D). The skin of the fish turns deep
black in closely adjacent areas. These areas thicken and
the scales stand out |
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The fish is affected with Melanosarcoma, a
malignant growth |
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No suitable treatment known. Sacrifice the
fish humanely. |
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E). One or more of the fish are
continually dark, ranging to black. They stand apart from
the others and do not feed anymore. A slight bloating is
often apparent |
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The fish are probably affected with a flagellate
infection of the gut |
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Treat with
Metronidazole -or-
Paracide-D. |
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