Question: asked about red spot disease of fish
Answer: lime/ chun @ 10 kg per bigha , apply in afternoon
observe the presence of parasite on fish body
1. if it is parascite: apply cleaner 30 ml per bigha or apply malathion 600 gram ber bigha 3 times after every 7 days interval
2. if it is bacterial ulcer: apply cifax 130 ml per 10 l water for 1 bigha pond
or antibiotic sulphadiazine 100 mg per kg feed 
thank you.