questions: asking about surfacing behaviour of fish 
 answers: told her that this kind of behaviour of fish generally occurs due to depletion of oxygen in water which is triggered by high organic load in water. decomposition of these organic matters cause depletion of oxygen levels in water, therefore the fishes suffer low oxygen rate in water (5mg/ltof water is desirable). 
clean the pond bottom and apply lime @ 20-25kg/bigha and also can apply potash @ 350gm/bigha after 2two to three days of application of lime.