Question: asking about death of fish 
Answer: suggestion
potassium permanganate @ 330 gram per bigha
cowdung @ 125 kg per bigha
ssp @ 2.5 kg per bigha
cifax for growth and disease @ 100ml cifax mix with 10 liter of water for 1 bigha and spray
 please visit kvk jorhat 9435352939 (dr. rupam borgohoian)