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:
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 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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