questions: asked about fish farming management 
 answers: for your condition, shift the excess number of fish to another pond (recommended number is 10000 to 20000 per hactare)
apply lime 10 kg per bigha and keep 7 days. apply cowdung @ 130 kg per bigha. after another 7 days apply urea and ssp @ 3.2 kg and 2.5 kg per bigha respectively.
feeding per day @ 3 % per body weight.
watre transparency should be 30cm to 40 cm.