close up of a artificial pond in the patio with koi fish swiming, in the city of hue, in vietnam

architecture asian building colordiversity colorful delicacy fish fishbackground fishdelicacy fishpond fishpopulation fishswarm fishy grass groups koi koifish koifishing koipattern koipond lake landscape natural nature old orange orangefish orangehues ornamentalfish outdoor overstocked oversupply plenty plentyoffish pond pondcapacity pondmaintenance pondmanagement populated