Which freshwater fish can survive in both cold & warm aquarium water?

Warm water fish needs a heater in the winters, & cold-water fish cannot survive in aquarium water without chillers or cooling fans in summers. Many aquarists are looking for fish species that adapt to the temperature of their location, so there is no need to use any heating or cooling method.

Aquarists are curious to know which fish can survive in both cold and warm waters so I have added 5 best cold & warm water aquarium fishes in this article.


1. Celestial Pearl Danio:

Celestial Pearl Danio can live & breed in summers when the room temperature is b/w 69 to 80 °F. In the spring season, I keep them in outside containers where the temperature drops from 50 to 60 °F.

In the wild, both Glowlight Danio & Gold Ringed Burmese Danio can live in streams that get snow sometimes.

Danios can endure temperatures below 15 °C. Even my Danios deposit eggs at lower temperatures than 15 °C, & the larvae endured.


2. White Cloud Minnows:

White Cloud Minnows can live in both cold & warm water
White Cloud Minnows can live in both cold & warm water

Although the ideal temperature for White Cloud Minnows is between 64 to 72°F, I found over the internet that they can endure temperatures less than 41°F. Therefore, there is no need to install a heater in their aquarium. I kept White Cloud Minnows in the backyard pond & they survived even when the water surface was covered in ice.


3. Rainbow Shiner:

Rainbow Shiners can tolerate temperature up to mid-70’s °F in summers.

I kept a group of eight Rainbow Shiners in my outdoor pond. In the winters, the temperature would drop below 0 °C. The surface of the pond was covered in ice but my Rainbow Shiners did not show any sign of sickness & they remain healthy during extreme cold.


4. Hillstream Loach:

Hillstream Loaches can tolerate up to 80 °F. At temperatures over 75 °F, an air stone or powerhead is required because oxygen depletes as temperature increases. Air stone adds many tiny bubbles in the water that carry oxygen. Powerhead causes surface agitation that removes CO2 from the water & adds oxygen.


5. Goldfish:

Goldfish can survive in both cold & warm aquarium water
Goldfish can survive in both cold & warm aquarium water

Goldfish can even survive in regions where temperature drops below 40 ˚F. If your aquarium water freezes, then Goldfish will have no access to oxygen. Oxygen can be added to water either through surface agitation where gas exchange takes place such as CO2 is escaped from the water & oxygen is added. Alternatively, an air stone will produce heaps of tiny bubbles in the water that allow oxygen to be added directly to the water. 

Goldfish are comfortable & happy in warmer water that reaches up to 80˚F temperature in summers.

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