The study was conducted to estimate the growth and survival of gold fish, Carassius auratus (average weight 4.5 g) and koi carp, Cyprinus carpio ( 12.5 g) in FRP tanks (500 liter capacity ) for 90 days with three different temperature treatments i.e. T1 : 18℃, T2 : 24℃ and T3 : natural water temperature . Temperature in T1 and T2 were maintained with thermostats (300 watt). The natural water temperature was recorded four times a day (6 am, 12 pm, 6 pm and 12 am) with digital thermometer . The lowest natural water temperature 4⁰C was recorded during early morning (6:00 am) in winter season (15th December, 2024 to 15th January, 2025) at Bathinda, Punjab. For both fishes, significantly higher growth performance were recorded in T2 treatment and the lowest in T3 treatment. In all treatments, there was 100% survival for both koi carp and gold fish . The results of above study indicated that both gold fish and koi carp could tolerate extreme winter (upto 4⁰C water temperature) in northern Indian state of Punjab .