The study area Gauripur located at 24°45'30"N and 90°34'30"E with an area of 274.07 square- kilometers, which is a sub-district in the district of Mymensingh, the northern part of Bangladesh. The four farms have been selected for the present experimental purpose and can serve as the representative sample of northern aquaculture management practices. The experiment was conducted in four farms e.g. locally known as Fish King Farm, Bondhon Hatchery, Masud Fish Farm and Peal Hatchery in the study area. The study was carried out for 100 days from May to August 2019 in the mentioned area. The ponds were having a similar rectangular size, depth, basin conformation, contour and bottom type. During the study, the water depth was maintained at a level of 1.0 to 1.5 m. In order to conduct the experiments, two treatments were considered for Vietnamese koi and another two for Thai koi among the four experimental treatments for the culture period of 100 days. In each treatment, two replications were considered to find out the result. The pond area was 0.08 hectares and the stocking weight was 0.2 gm in all treatments. a well-designed system of inlet and outlet. After drying, quicklime (CaCO3, 250 kg/ha) was spread over the pond bottom. Then, all the ponds were filled with groundwater. Five days subsequent to liming, the ponds were fertilized with organic manure. Quicklime (50 kg/ha) was maintained fortnightly to control the water quality of different treatments. With a view to exploring the proper result the aquatic weeds, undesirable fishes, insects, and other aquatic organisms were removed manually and the grasses on the pond dykes were also pruned manually into very small size. The ponds were dewatered, exposed to full sunlight and had An initial length of 0.75±0.01 cm was stocked in all the treatments. Stocking densities were designed at the rate of 1,72,900/ha for Vietnamese koi and Thai koi in treatment T1 and T3. While stocking densities were designed at the rate of 2,47,000/ha for Vietnamese koi and Thai koi in treatment T2 and T4. Supplementary readymade floating Mega feed and sinking Saudi Bangla feed was supplied at the rate of 6-80% of their total biomass twice and daily commencing from the first day of stocking. The proximate composition of the feeds was analyzed according to the AOAC method, nitrogen-free extract (NFE) by subtraction. Floating Mega feed was supplied in early-stage and sinking Saudi Bangla feed was supplied after 35 days of rearing for daily ration. Proximate composition (% dry matter) of the supplementary floating Mega feed (crude protein, crude lipid, crude fiber, ash, moisture and nitrogen-free extract) of experimental feeds was 30.0%, 3.0%, 10.0%, 17.0%, 12.0% and 28.0%; and sinking Saudi Bangla feed (crude protein, crude lipid, crude fiber, ash, moisture and nitrogen-free extract) was 30.0%, 6.0%, 07.0%, 18.0%, 12.0% and 27.0% respectively. At the beginning of the experiment, the feed was supplied at a rate of 60% (1st month), followed by 20% (2nd month) and 7% (till harvesting) of their body weight. Half of the feed was supplied at 09:00 AM and the remaining was supplied at about 05:00 PM. The feed was supplied by the spreading method manually. The physicochemical parameters of pond water were monitored every ten days interval throughout the experimental period between 09.00 AM to 10.00 AM. Parameters such as temperature (°C), dissolved oxygen (mg/l), pH, alkalinity (ppm) and ammonia (mg/l) were determined at the fortnightly of the pond. Water temperature was recorded using a Celsius thermometer, transparency (cm) was measured by using a Secchi disc of 20 cm diameter, dissolved oxygen, pH was measured directly using a digital electronic oxygen meter (YSI, Model 58, USA) and an electronic pH meter (Jenway, Model 3020, UK) and total alkalinity were determined by the titrimetric method in the laboratory. The water recycling method is developed regularly for controlling pollution of the excretory product of individual and plankton bloom. Inlet and outlet system of water body was to be processed and sometimes the water was recycled by a pump machine to maintain the ecosystem of the ponds. Fish sampling was done at fifteen days interval in the morning from around 09.00 AM to 10.00 AM During each sampling fish were caught by cast net and a minimum weight of 15 fish was taken by precision weighing balance (accuracy up to 0.1 g). The following parameters are used to evaluate the growth of fish such as weight gain (g), average daily weight gain (g), percent weight gain, specific growth rate (SGR), food conversion ratio (FCR), survival rate (%) and production (kg/ha/100 days). The data obtained on the growth of fish, FCR, survival rate and production were statistically analyzed to see whether the influence of different treatments on the growth (weight) and production of fishes was significant or not significant using a significant test.