Ecology, Environment and Conservation Paper

Vol 23, Feb 2017 Suppl. Issue; Page No.(245-254)

PATHOGENESIS DEVELOPMENT OF EDWARDSIELLA TARDA INFECTION IN INDIAN MAJOR CARP (LABEO ROHITA)

Ranjeeta Kumari, Sajal Kole, Gayatri Tripathi and Megha K. Bedekar

Abstract

Diagnosis of fish diseases is a single important step towards proper management and control during a disease outbreak in an aquaculture farm. Bacterial pathogens causes major nuisance in Indian aquaculture scenario. Most of the bacterial diseases causes similar pattern of signs and symptoms in the host fish. Thus it becomes utmost necessary to differentiate the disease manifestation of different pathogens for an effective remedial measure. In an attempt to differentiate Edwardsiellosis disease from other fish diseases the present study investigated the pathological manifestation of Edwardsiella tarda infection in Indian major carp (Labeo rohita). Symptoms of the infected fish versus control fish were compared in terms of clinical signs, histopathological signs, haematological parameters and enzyme assays. Clinical signs observed were necrotic lesions, distended abdomen and swollen anus due to the accumulation of ascitic fluid, along with extensive haemorrhages, and darkened body. In terms of histopathological observations, the kidney tissues displayed inflammatory cells, congestion, dilated renal tubules and nuclear enlargement exhibiting acute inflammation whereas the liver tissues showed, diffuse cell injury by the presence of necrotic hepatocytes, lymphocytes, constricted sinusoids and enlarged nuclei at places. In addition, time-oriented differential data on haematological parameters as well as enzyme assays between the infected fish and the control explains the modus operandi of the bacteria in causing insults to the host.

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