A common parasitic disease which cause problem in carp farming - Fish lice ( argulus sp).

Hello everyone:
           Today we will see about the common parasite infection fish lice which is caused by argulus species. 

Carp farming:
           Polyculture of carps is common in all over India. Different species, different feeds, different environmental parameters causes various problems in aquaculture sector. 

Fish lice :
           It is a parasitic infection which is caused by argulus species. Argulus is a crustacean parasite which undergoes different lifestages. This parasite attached to the skin and scales of the fish and continually sucks the tissues and blood from host body. 
              It gives more irritation to the fish. It causes wound and leads to secondary bacterial and viral infections. 

Life stages:
              Argulus species like Argulus stamensis, Argulus japonicus are mostly causes secondary infection to the host. 

                         Argulus
           Attached to the host body
                  Develop into adult
                           Eggs
                     Metanauplii

In this, adult can freely swims into water without host for more than 5 days. 
But the hatched metanauplii can swims freely into water upto 2 to 3 days without host. 

Severity of infection:
            Initially the affected numbers will be very low. If you find any single fish affected with this infection, you have to immediately take an action. 
             It will spread into other fishes rapidly and causes secondary infection and mortality. 
               Some researchers find, they also leads to cause some viral disease as an secondary infection. 

Prevention:
              Proper drying of pond is important before stocking. 
              Liming the pond is necessary to prevent and kills the dormant eggs and other infectious agents. 
               Proper sampling of fishes. We have to check the animal health and check the signs of disease at regular intervals. 
               Proper selection of seed for stocking. 
                 
It spreds very fast to the adjacent ponds. 

Signs:
               The affected animal shows lethargic and shows irregular swimming. You can able to see the parasite visually. 
There are various commercial medicines available to cure and prevent the disease. 
                           Thank you🙏. 

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