Vibriosis in Grouper
Vibriosis is a bacterial disease affecting many marine fish, including the brown grouper (Epinephelus marginatus). It is caused by bacteria of the genus Vibrio, naturally present in seawater. The disease becomes a significant problem mainly...
What is it?
Vibriosis is a bacterial disease affecting many marine fish, including the brown grouper (Epinephelus marginatus). It is caused by bacteria of the genus Vibrio, naturally present in seawater. The disease becomes a significant problem mainly in aquaculture or when the fish is weakened, stressed, or injured. It can progress rapidly and cause substantial losses in a pond or farming cage.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Grouper with vibriosis often show general lethargy: they swim less, remain near the bottom or away from the group, and lose appetite.
Redness and small hemorrhages on the skin are frequently observed, particularly at the base of the fins or around the mouth.
Skin ulcers (open wounds that do not heal) may appear, sometimes accompanied by localized swelling or slight abdominal edema.
In severe cases, the fish swims erratically, loses balance, and death can occur within a few days, especially if multiple fish are affected in the same pond.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
FAO — Organisation des Nations unies pour l'alimentation et l'agriculture
Content reviewed by the TunisieVet editorial team · Updated 31 August 2026
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