questions: aksed about the prophylactic measures of eus disease 
 answers: given the prophylactic measures as: 1. lime application: apply  quick lime(cao) @ 100 ¿ 600 kg/ha. higher doses of lime are required in low alkalinity water and lower doses are required in high  alkalinity water. the lime is applied at an interval of one month during the disease outbreak. 2. potassium permanganate(kmno4) : apply kmno4 to the affected pond @ 1-2 ppm after liming the pond before the onset of winter 3. avoid netting as far as possible during winter months.