Premium
Edwardsiellosis in farmed rainbow trout ( O ncorhynchus mykiss )
Author(s) -
Řehulka Jiří,
Marejková Monika,
Petráš Petr
Publication year - 2012
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2011.02968.x
Subject(s) - rainbow trout , edwardsiella tarda , biology , lethargy , carp , fish farming , carassius auratus , common carp , zoology , fish <actinopterygii> , anatomy , aquaculture , fishery , cyprinus , medicine
E dwardsiella tarda was isolated from naturally infected rainbow trout ( O ncorhynchus mykiss ) in raceway culture on a commercial fish farm where the fish were kept at a density of 110 kg m −3 and at a water temperature of 14°C and with a photoperiod of 13 h light:11 h dark. The clinical signs of diseased fish (150 ± 20 mm standard length) were anorexia and lethargy. The most striking lesions in the fish were in the liver. There were hyperaemia and haemorrhages; on histopathological examination, the liver displayed inflammatory infiltrate in portal area, focal necrosis, dilatation of blood sinus and activation of sinusoidal cells. Infection experiments, performed 2 years after isolation of the original culture of E . tarda , were carried out under laboratory conditions at water temperatures of 15, 18 or 24°C. All experimental fish (common carp, Prussian carp, tench), intraperitoneally injected with 8 × 10 6 cells, demonstrated a total resistance to E . tarda .