engleski

Intestinal ulceration and enterotoxemia in carp: case hhistology and implications

In a case of mortality among three-year-old carp (Cypeinus carpio L.). all fish had extended bellies due to blisters in serosa and a large intestinal ulcer at the same location. Goussia carpelli was abubdant in the intestine and very few aerobic bacteria were found in kidneys and livers. Virus was not isolated from fish. Histology revealed characteristics of the ulcer, coccidian and non-coccidian enteritis, a peculiar capillary meshwork in the basal membrane below enterocytes, massive infiltration of veins in propria by basophils, generalized vascular changes, serous peritonitis and pericarditis, as well as degeneration and necrobiosis in organs ascribable to a toxin. The death was caused by the heart failure due to degeneration and necrosis of the myocard as well as to the blood coagulation in spongious part. Unusual histological findings included also the rodlet cell reaction in the arterial bulb and the sclerosis of ventriculobulbar valves. Staining for bacteria demonstrated a long gram-positive rod in intestine, seemingly in monoculture. Factors that probably caused such alterations and implications of findings for fish pathology will be discussed.

Carp; enterotoxemia; intestinal ulceration

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