Bacterial fin rot (Bacterial Fin Disease)


Subepithelial petechiae
Small bloody red spots appear on fins.
Bare rays
All interstitial tissue on fins has been eaten away.
Cloudy completely
Fins are completely covered in opaque/grey cloudiness.
Fins frayed or ragged
Fins look as if they are rotting away, giving eroded appearance.
Grey/white spot around head.
Around the head area is a large grey or white spot.
Haemorrhages - skin
Bloody haemorrhages are apparent over several parts of the skin.
Hyperaemia - fin base only
Excess of blood at base of fin.
Loss of membrane & rays
Fins are eaten away, both the rays & the interstitial membranes between
Subepithelial petechiae
Small bloody red dots or effusions, evident below skin.
Tail torn
Tail is ragged and torn, with eaten away look.
Exophthalmia - bilateral
Both eyeballs of fish are protruding.
Exopthalmia - unilateral
One eyeball of the fish is protruding.
Listless and lethargic
Fish moves very lazily in water, much less than normal, lacks interest.


Bacterial infection by Aeromonads,   Pseudomonads flourescens and Vibrio.  Poor conditions, unbalanced diet and other stress can be a predisposing cause.


If caught in the early stages outlook is favourable.


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