I have cultured chital on live feed of 2-3 GM with a SD of 5000 in 0.7 ha. after 2 month culture the total weight is approx 15-17 GM...and tilapia of 250-350 GM....now we are assuming that tilapia is breeding in the chital pond and the tilapia young one is fed by chital...but recently we are getting few species of chital dying due to unidentified reason. please help me figur it out to resolve the issue...pics are ATTACHED