Can Oscar Fish Live In Cold Water?

Can Oscar Fish Live In Cold Water

Aquarium fishes are adorable aquatic animals, especially when you watch them perform their daily activities. Oscars are not left out in this regard. Astronotus ocellatus is the scientific name for Oscars. They are mostly found in the Amazon basin because it is their place of origin. Because of where they originated, they tend to be choosy in staying in either cold water or hot water or even water with moderate temperatures.

No! Oscars cannot live in cold water. This preference is mainly because of their origin. The temperature in the Amazon basin can rise to 91°C and can go nothing lower than 71°C. This reason alone makes them selective and will not allow them to stay healthy or even alive in cold water.

They can’t survive in water with a temperature lower than 54 degrees Fahrenheit and any temperature lower than this means death.

Can I put My Oscar Fish Outside The House?

The major factor that can determine if your Oscar fish can stay outdoor or indoor is the environmental temperature.

If you live in a tropical area where the temperature does not go lower than 54°F, then you can put them outside. But in case of other regions where the temperature goes lower than 54°F, then it is advisable to keep your Oscar fish indoors, obviously in its tank.

Likewise, if you decide to keep your Oscar fish outside the house, then you have to heat the water whenever the water goes below the standard temperature that is most suitable for them. In this way, you can make your choice and still keep the Oscar fish healthy.

You can also add plants to the tank. Water Hyacinths are most likely the best to add to the tank. Oscars, just like every other cichlid, they like to burrow at the root of the plant. This act helps them to go on with their daily life activities. You will also need a sound filtration system because Oscars tend to mess up tanks and aquariums.

What do I Feed My Oscar?

What they eat depends on what you feed them, yes; they feed on what you give them. But Oscar feeds on what you give them doesn’t mean they feed on everything, but they feed on what most fishes eat.

In the wild, they are omnivorous; they feed on both flesh and plants. They can either eat fishes, snails, etc. or they eat algae, plants, etc. their main diet includes invertebrates and other small animals. They also feed on shrimps, clams, insects, and so on. And just like other fishes they, they feed on aquatic plants and algae.

Oscars live in freshwater and so feed on freshwater organisms. These freshwater organisms are highly nutritious. So they make Oscars grow fast. Oscars may be small at their young age, but the aquarist needs to get a large aquarium to accommodate them when they become significant in their adult stage.

Can Oscars Breed In Cold Water?

Oscars only breed when the environmental conditions are favorable. Temperature is one of the crucial conditions for smooth breeding for Oscars.

Aside from environmental temperature, Oscars don’t breed unless they become mature. And they attain their sexual maturity at 14 months when they are about 6 to 10 inches long. But most Oscars refuse to breed until 2 to 3 years of staying alive. Oscars have a unique breeding technique.

They only mate under satisfactory conditions. They mate only when there is enough space. This condition applies to the domestic ones. For the 6 inches type of Oscars, 70 to 125-gallon aquarium size is suitable. The minimum size of the aquarium for both parents and fries is 55 gallons.

Oscars don’t mate randomly as other fishes do. They mate with just one Oscar per season. They both become aggressive and protect their fries and territories. Oscars are choosy when it comes to picking their mate. This preference, most times, results in one pair usually.

Tank Setup For Oscars

Oscars are freshwater fishes generally known for their dog-like behavior and large size. This fish can be fantastic to have in your aquarium, but you need to provide the necessary conditions for this fish to thrive in the aquarium.

Setting up your aquarium in the wrong way might be disastrous. Oscars can grow as long; therefore, the first condition that you have to is the amount of space. The aquarium must be big enough to accommodate them.

Oscars are territorial and aggressive, especially during mating periods. So, they tend to attack other smaller fishes in the aquarium if there isn’t much place to claim as territory. Plants should be grown in the tank also.

These plants allow smaller and weaker fishes to hide and stay away from Oscars. These conditions should be followed in order to maintain the fish population in the tank. Rocks should also be present in the tank. It also helps hide fish and increase the burrowing act of the Oscars.

Oscars swim at the mid-level of the tank. They often go to the bottom of the tank in search of substrates. They can also uproot plants and destroy decorations during their search. Therefore, it is advisable to regulate the ratio of floating food to sinking food that you give to fishes.

The sinkers should be the priority in order to satisfy the Oscars. And the floaters should be assigned to satisfy every other fish in the tank aside from the Oscars.  Oscars again can’t tolerate acidic or alkaline water since they generally live in freshwaters.

The pH of the water must be kept in check so as not to be acidic. They can probably tolerate only slightly acidic or slightly alkaline conditions. The amount of sunlight that penetrates the tank should. This regulation is because Oscars can’t tolerate direct sunlight, as it seems harsh on them. So, the light rays that penetrate the tank should be regulated.


Oscars are beautiful fish. They are worth being kept as pets only if you can go through the stress of providing their basic amenities and considering their conditions. Their conditions are relative to comply. So, in order for you and your Oscar to have a blissful stay together, I implore you to make do of the laid down conditions.


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