Aquarium water temperature for fish - frequently asked aquarists

Have you ever thought about why different fish need different temperatures? And how does the discrepancy affect them? And how sensitive are they to differences? Aquarium fish do not tolerate rapid temperature changes, this is one of the reasons that newly acquired fish die. In order for the fish to become comfortable, they need to be acclimatized.

Simply put, the higher the water temperature, the faster the fish grow, but also age faster. We have collected some frequent questions about the temperature for aquarium fish and tried to answer them in an accessible form.

Cold-blooded fish?

Yes, their body temperature directly depends on the ambient temperature. Only a few fish, for example, some catfish, can change body temperature, and even sharks maintain body temperature several degrees higher than water temperature.

Does this mean that water temperature directly affects fish?

Water temperature affects the speed of physiological processes in the body of fish. For example, in winter, the fish of our reservoirs is inactive, since the level of metabolism drops significantly in cold water.

At high temperatures, water holds less dissolved oxygen, and for fish it is very important. That is why in the summer we often see how fish rise to the surface and breathe heavily.

Aquarium fish do not tolerate rapid temperature changes, this is one of the reasons that newly acquired fish die. In order for the fish to become comfortable, they need to be acclimatized.

Simply put, the higher the water temperature, the faster the fish grow, but also age faster.

How sensitive are fish to temperature extremes?

Fishes feel the slightest changes in water temperature, some even such as 0.03C. Aquarium fish are usually all tropical species, which means they are used to living in warm water with a constant temperature. With a sharp change, if they do not die, they will survive significant stress and become infected with an infectious disease, due to weakened immunity.

Fish that live in a climate like ours are much more stable. All cyprinids, for example, tolerate different temperatures well. What can I say, even the well-known goldfish can live both at a temperature of 5C and at more than 30C, although such temperatures are critical for them.

Are there any fish that carry extreme water?

Yes, several species can temporarily live in hot water. For example, some species of killfish that live in Death Valley can carry up to 45 ° C, and some tilapia float in hot keys with a temperature of about 70 ° C. But they all can not live long in such water, the protein in their blood just starts to fold.

But there are more fish able to live in ice water. At both poles there are fish that produce a kind of antifreeze in their blood, allowing them to live in water with a temperature below zero.

What if the summer is very hot?

As already mentioned, warm water retains less oxygen, and fish begin to experience oxygen starvation. They begin to suffocate, and the first thing to do is turn on powerful aeration or filtration to enhance the movement of water and metabolic processes in it.

Next, you need to put a bottle of cold water in the aquarium (or with ice, if you were preparing for such a situation), or replace part of the water with fresh one with a lower temperature.

Well, the simplest and most expensive solution is air conditioning in the room. And in more detail about all this read in the material - hot summer, lower the temperature.

And the simplest and most inexpensive is to install 1-2 coolers so that they direct the air flow to the surface of the water. This is a proven cheap way to cool the temperature in an aquarium by 2-5 degrees.

What tropical fish can be kept in cold water?

Although some tropical fish, such as corridors or cardinals, even prefer cool water, for most it is too much stress.
The analogy is simple, we can also live quite a long time on the street and sleep in the open air, but in the end everything will end sadly for us, we will at least get sick.

Do I need to replace the water in the aquarium with water of the same temperature?

Yes, it is desirable that she be as close as possible. But at the same time, in many species of tropical fish, the addition of fresh water with a lower temperature is associated with the rainy season and the beginning of spawning. If to breed fish in your tasks is not included, then it is better not to take risks and equalize the parameters.

For marine fish, you definitely need to equalize the temperature of the water, since there are no sudden jumps in sea water.

How long does it take to acclimatize a new fish?

You can read more about acclimatization by clicking on the link. But, in short, in fact, fish need a lot of time to get used to new conditions. Only the water temperature is critical when planting in a new aquarium, and it is desirable to equalize it as much as possible.

Watch the video: Acclimating New Fish Into Your Aquarium, The Ultimate Guide To Your First Aquarium Part 7 (February 2020).

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