questions: asked about the fish behaviour of coming up to the surface. 
 answers: told him to do aeration early in the morning and early evening - spilt bamboo can be used to disturbed the surface of the pond for the oxygen to mix. otherwise buy an aerator, or oxygen tablet from pharmacy and apply accordingly after asking the pharmacist as different company brand will have different concentration of oxygen. potassium permanganate crystal should be applied for 2 - 3gm or 2-3 crystal mix in water and spray it in the pond and do this at night and repeat after 4days. for feeding 2kg per day can be provided for average 450gm of fish. and the feed should be kept in a sack of onion fixed in the pond by a bamboo pole and the sack should be made with  hole at the bottom.