Vibriosis of sea-bass (Vibrio anguillarum)
External haemorrhagic appearance of skin and fins, distended belly, inflamed anus and exophthalmus of diseased fish.
Pale liver with petechiae, splenomegaly and distended intestines filled with yellowish transparent fluid comprise typical necropsy findings of vibriosis. Often there is excessive visceral fat due to chronic overfeeding. The swim bladder is frequently distended hence many of the moribund and dead fish float on the surface.
At necropsy, vibriosis on young sea bass fry presents itself without the typical acute haemorrhagic lesions. The usual signs comprise rather mild inflammation/reddening as well as degeneration of the cartilagenous tissue of the lips and reddening of the skin of the lower jaw and of the opercula.
Sometimes sea bass fry suffering vibriosis exhibit deep necrosis of the trunk of the tail peduncle and the caudal fin. Cannibalistic activity against the sick fish by their cage-mates may predispose to such lesions.
Author: Dr. Panos Varvarigos
Freelance Veterinarian - Fish Pathologist, Athens, Greece.
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