Abstract
During the period 2014-18, a total of 219 cases of fish mortalities were being investigated under a passive surveillance programme. Among different disease incidences parasitic diseases were found to the major contributor accounting for 74.88% cases followed by bacterial diseases of 12.79%, mixed bacterial and parasitic diseases of 10.50% and viral diseases of 1.83%. Among different parasitic cases mixed parasitic infections (37.80%) were found to be premier cause of disease followed by Argulosis (19.51%), Dactylogyrosis (18.90%), Myxosporean infections (12.80%), Trichodinosis and Ichthyophthiriasis (3.04%) and other parasitic infections (4.88%). Among bacterial infections, aeromonads group account for 66.66% diseases besides few emerging pathogens of public health significance. Catla was found to be the most susceptible species and winter season being the most favorable season for occurrence of infectious diseases. Fishes weighing 100-500 g were most vulnerable to disease occurrence. This study generated a comprehensive disease incidence scenario in freshwater aquaculture in eastern India.
Highlights
The total fish production of India during 2015-16 was 10.79 million metric tonne (MMT) (DAHDF Annual Report 20162017) in which aquaculture contributed to more than 60% of total production
The study primarily explains about prevalence of different fish diseases, host/size preference, and seasonality of infections that occurred during 2014-2018 mainly at different parts of eastern India in the major freshwater aquaculture farms
Incidences of diseases Among different infectious diseases, parasitic diseases were found to be the major cause of disease incidences in the freshwater aquaculture sector
Summary
The total fish production of India during 2015-16 (provisional) was 10.79 million metric tonne (MMT) (DAHDF Annual Report 20162017) in which aquaculture contributed to more than 60% of total production. Mohan and Bhatta [2] described the extent of social and economic impact of two important fish diseases namely epizootic ulcerative syndrome (EUS) and white-spot disease on rural aquaculture. Gopal et al [3] recorded parasitic disease incidences as most prevalent among all other diseases in India. Because of the proper monitoring and intense surveillance several fish viral diseases have been reported from the country which was earlier neither been detected nor been reported, e.g. cyprinid herpes virus 2 [4], carp edema virus [5], tilapia lake virus [6], ranavirus [7], etc. There are many missing links in the disease prevalence scenario in India which only can be fulfilled with structured and continuous monitoring and surveillance
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