Question:  query regarding fishery cum duckery 
Answer:  the shed ( farm house )  for the duck preferably should be made over the pond . the size & shape of the shed is depend upon the the size & shape of the pond ( rectangular . elongated , square , etc )  , the such shed give a shadow to the fish in  rearing pond ( either hatchery / stoking pond ) . the excreta of duck is the direct source of fish feed which are regularly fall over the pond water minimising the labour cost , besides such constructed shed give protection to the duck from vector ( mice, rat  etc ) & wild animals ( fox, jackel etc ). the feed supply to the fish can be tied directly on the post which are  made for for the duck shed , thus manipulation of feed bag can be done easily from the inner portion of the duck shed . the investment of capital is depend upon the type of shed