Aquaculture has emerged as one of the most promising and
fastest-growing industries, and provides high-quality animal protein,
raises nutritional levels, and generates income and employment
around the globe [1]. Indian Aquaculture production mainly
consists (~87%) of 3 native major carps and 3 exotic carps. Among
exotic carps, Cyprinus carpio, commonly known as common carp, is
an important candidate species with global production of approximately
3.7 million tons during 2010e11 [1]. With the ever
increasing demand for this species, there has been a shift in
aquaculture practices, moving from extensive systems towards the
semi-intensive and intensive systems. Bacterial infections are one
of the important causes of disease problems in Indian aquaculture
[2]. Aeromonas hydrophila is the most common pathogen, and it can
easily spread through accidental abrasions [3] and causes haemorrhagic
septicaemia, ulcers, exophthalmia, abdominal distension
[