Goiter (Thyroid Hypertrophy)


Red spots on throat of fish
Throat area has many small red spots.
Swelling on throat or neck.
Throat and/or neck area obviously swollen.
Growth protruding from gill
A growth can be seen protruding out from the gill.
Respiration rapid
Fish is breathing very fast, much faster than is normal.
Exophthalmia - bilateral
Both eyeballs of fish are protruding.
Gills extended wide
Gills are flared open extended almost to right angle to body.


Often is caused by a lack of Iodine in the diet.


Can be corrected by altering dietary formula to include extra Iodine. If only single fish are affected it may be ignored, but if several fish develop the condition suspect lack of Iodine.


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