Do betta fish hibernate?

In this blog, we will discuss whether betta fish hibernate or not.


In this blog

  • Do betta fish hibernate?
  • What temperatures do betta prefer for their metabolism?
  • Do koi bettas hibernate?
  • Can betta fish die from a sudden temperature change?
  • Do bettas hide when the tank temperature is low?
  • Is it normal for bettas to rest in dark?
  • Do bettas became inactive due to ammonia spikes?
  • Summary 
  • Frequently asked questions

Do betta fish hibernate?

No, betta fish don’t hibernate.Bettas usually rest for hours when they feel lazy or sick. There are overall 73 different species of betta fish, none of them hibernate.

Hibernation is neither reported in wild bettas nor in captive betta as well. It could be seen in other fish species but not in bettas.

Bettas become inactive or rest for hours due to wrong water temperatures. They come from warm waters and prefer the same temperature in their artificial environment. 

If there are temperature fluctuations or the water is not warm, bettas sleep for hours and remain inactive, until the temperature becomes suitable again.

Keep reading the blog, I will discuss the same in detail.

What temperatures do betta prefer for their metabolism?

The temperature of an aquarium affects the fish’s metabolism, which in turn affects their health and well-being. 

Maintaining the right temperature in the aquarium environment is essential to keep your bettas active and healthy. A sudden drop in the temperature can make them inactive and weak.

Bettas being a tropical fish prefer a temperature range between 76-80F. They are hardy species and can survive in any condition, but the wrong temperature is something they can’t tolerate.

Being a betta owner, you have to replicate the same temperature as their natural habitat. If you are not maintaining and monitoring their aquarium temperature, you will find them resting for hours or they might get infections too due to low temperatures.

  • Ideal water temperature for betta fish-76F-80F. 
  • A good quality heater with a thermometer can help to maintain the internal environment the same as in their natural habitat.

Do koi bettas hibernate?

Some Koi species hibernate to keep their internal temperature stable for some time. Once the hibernation process is complete, the fish return to a normal state. But koi bettas won’t hibernate. None of the betta species hibernates.

Some bettas are very active, some are lethargic, and some do not interact with others. It all depends on their mood.

If bettas are inactive for a short period and then resume their normal activities, it’s okay. But if they remain inactive for a long period, or over a few days, there may be a problem. They may be experiencing some stress because of temperature fluctuations, ammonia spikes, or if they are kept with aggressive tank mates.

Can betta fish die from a sudden temperature change?

Every organism needs a certain temperature range to survive comfortably. If the temperature goes too high or too low, it could be harmful to them. The same goes for betta fish, which are tropical fish species that live in warm waters in their natural habitat. 

If you are keeping them in aquariums, you need to provide the same water parameters in their artificial environment. 

Bettas prefer a temperature range of 76-80 degrees Fahrenheit to survive and anything below 76 degrees can have a big impact on their health and even kill them if it happens suddenly. 

To keep bettas healthy and active in an aquarium setting:

  • Remember to keep the betta tank temperature between 76-80 degrees.
  • Always monitor the temperature to make sure it stays at a comfortable level.
  • A heater and thermometer are mandatory to maintain a warm temperature and a thermometer to check the water temperature.
  • Avoid keeping the aquarium near the window of the house, as it can easily cool the aquarium.
  • If your heater isn’t working, cover the tank with towels to avoid temperature fluctuations.

Do bettas hide when the tank temperature is low?

Yes, bettas hide and remain lazy and dull when the tank temperature is below the required temperature. They hide in the plant covers or rest on them to feel safe and secure.

Bettas will remain hidden until the tank temperature becomes normal or in the range suitable for them to thrive.

Always provide lots of covers in bettas tank to me them feel safe and secure. If you don’t provide covers they might die out of stress and temperature shocks.

Is it normal for bettas to rest in dark?

Bettas usually rest in the dark to maintain sleep cycles. They do not sleep like humans by closing their eyes. It is perfectly normal for their eyes to remain open when they sleep.

If bettas had been resting or hiding during the day, there might have been two reasons, he is ill because of the low temperature or because the brightness in the tank was too high.

It is essential to maintain and monitor tank temperatures everyday to keep your bettas healthy and active.

Too much brightness can stress your betta fish, and they may retreat to a more hidden location due to the increased lighting. If you want to watch your fish in good health, always choose the right lighting in their tank.

Do bettas became inactive due to ammonia spikes?

We all know bettas are hardy species and can withstand harsh conditions. This is the same with both wild and aquarium-raised bettas. But they are very sensitive to ammonia spikes, and such spikes are due to leftovers, plant waste, and other tank mates’ biological waste.

If you keep your bettas’ tanks filled with biological waste, their water chemistry will change and they will become lethargic and more susceptible to infections.

Some betta keepers do misunderstand bettas’ inactivity due to ammonia spikes as hibernation.But the fact is betta fish bettas snooze or take naps but they never hibernate. In the case of ammonia spike bettas, they cant withstand the water chemistry and remain dull in a specific spot in the tank to avoid such alterations.

It is essential to remove leftovers and plant waste every day from the betta’s tank. If this is left unattended you are sure to see ammonia spikes in bettas tank. 

Always use the best quality water testing master kit to check water parameters to maintain pristine water conditions in bettas tank. There are several water testing kits available, so it’s a good idea to always have one on hand to make sure the water conditions are safe for your betta fish.


Betta fish are very smart, beautiful, and friendly aquarium fish. They are also curious and love to explore their surroundings. They love to swim and show off their massive and colorful pectoral fins in the tank. They enjoy swimming alone in the tank and remain active when given the right amount of care.

If you replicate their natural environment and provide them with a good quality diet, your bettas will live for three years.

If you don’t keep the temperature of the aquarium normal and there’s a sudden change of temperature, your betta may die of temperature shock or become inactive or dull. 

Some people believe that this inactivity is hibernation, but this is not the case. Bettas cannot handle sudden temperature changes or large water changes. If they are experiencing such stress in the tank they become dull and lazy and choose to hide and rest in their hideouts.

  • Betta fish never hibernate.
  • Bettas prefer to sleep in the dark aquarium environment.
  • Betta fish ideally need a temperature range (76 to 80F) to function properly, and when it decreases or varies, it affects the overall metabolism, makes them lazy, and susceptible to various infections.
  • Koi bettas don’t hibernate.
  • None of the betta species hibernate.
  • Always provide lots of hideouts in bettas tank to make them feel safe and secure.
  • Check your tank temperatures and monitor them daily with a good quality thermometer to avoid temperature fluctuations.
  • Remove leftovers, plant and other bioload form bettas tank everyday to avoid ammonia spikes.
  • Install heaters in bettas tank to maintain the ideal temperature in bettas tank.
  • Betta fish inactivity is often misinterpreted as hibernation. Betta fish do not hibernate, they sleep during the night and are active during the morning. If they do not show any activity in the morning, please check the water temperature and other water parameters.

Frequently asked questions

Do bettas hibernate in winters?

Bettas, don’t hibernate, be it winters or summers.

Are bettas prone to mood swings?

Yes, bettas can be moody, and they have mastered the hide and seek game quite well.

Do bettas like plant covers in their tank?

Yes, bettas love to hide and would feel great if you add floating plants or silk plants in their tank.

Do bettas inactivity misunderstand as hibernation?

Yes, bettas inactivity is misunderstood as hibernation. Bettas become inactive due to low temperatures or sudden temperature fluctuations.

Can bettas survive without a heater in their tank?

Yes, bettas can survive a heater only in one condition, if the temperature in that region is consistent at around 76F.