Coldwater is the water which has the lower temperature in it. The coldwater fishes are those species of fishes which do not need to have a specific range of temperature to live in. In the context of aquariums, the coldwater organisms are those fishes who show the good growth rate in cooler water as compared to heated water. On average the cold water has the temperature below 20 degrees of Celsius.
The list of coldwater fish species is given below: