Oscar fish
Basic information about the Oscar fish species:
Maximum size (min-max): 30.0 - 40.0 cm ( 11.8 - 15.7 in)
Recommended temperature: 24.0°C - 30.0°C ( 75.2°F - 86.0°F)
Recommended
water hardness (
dGH):
dGH 4.0 - 18.0 N
Recommended
pH of water: 6.5 - 7.5
Origin: South America
Introduction to the Oscar fish
This fish is very intelligent, it can even recognize it’s owner.
Oscars have they own
ideas, although they're not the only fish having them. If Oscars don´t like how the items are placed in the aquarium, they pick them up and replace them, or they spit it out from the tank. It doesn’t matter if the plant or
rock is real or plastic. If you have a high aquarium, standing near it can be dangerous. The best choice is to have a sand bottom and a few big
rocks in the tank. Sometimes Oscars pretend that they are dead. In nature they pretend to be dead and wait until a small fish comes close so it can be caught and eaten.
Behavior
Oscars are aggressive fish so they need a big aquarium and a large group, because if there are only a few specimens in the tank, they will fight, and the weaker Oscar will feel miserable. The best solution is to have either one or many (6 is the minimum) Oscar fish, but never only a few. I have heard that sometimes three fish get along well, but usually they fight and attack each other without apparent reason. However, even if you have more of them in one tank, when they grow up a male and female may separate from the group and start to defend a part of the tank, in which case it is better to remove them. Understanding their behaviour is also important to avoid diseases as diseases are mainly caused by stress. Put two Oscars into a 100 L fish tank is like asking for a problem; not only they'll likely fight, but also they will feel uncomfortable and diseases are just a matter of time.
Oscar fish pictures

Information about care
In general. any Oscar fish grows very fast. As fry they do not need much space, but as they grow they need more and more space. The aquarium for one Oscar fish should be at least 2000 litres. So if you want to have a happy fish with happy friends, you really need a very large aquarium. I would recommend having an Oscar aquarium only in large spaces like big restaurants, or you can keep them in garden aquariums, but not in an ordinary room. And, just like in all tanks it is important to have a
filter,
gravel, and a
heater. The optimum temperature is between 26-28 °C.

Special thanks to Abel Guerrero for his picture.
The tankmates
The best tankmates for Oscars are Large Plecostomus and other large Neotropical Cichlids such as Texas Cichlids,
Jack Dempseys,
Salvini, and other cichlids from South America which are the same size or bigger. From the Oscar species the less aggressive are Pink Tiger Oscars. That is the reason why Red Oscars and Tiger Red Oscars can make Pink Tiger Oscars miserable. You should ensure that the Pink ones get their
food too. Choosing tankmates is very important as plenty of people end up with Oscars only even though they've planned a
community aquarium; The Oscar fish will simply eat small species.
In nature Oscars eat small fish. But in aquariums small fish can introduce diseases. Use
live food wisely and try to keep the Oscars healthy by using vegetable based
food with
vitamins.
Breeding the Oscar fish
Breeding isn’t very difficult if you keep a pair. Firstly, I’d like to say something about the water quality. Clean water is required, as well as a stable temperature of about 28°C. Don’t try to breed them in cold water, or water of poor quality. If you keep them in the same tank prior to a breeding program they will probably need some motivation, so remove a male for one or two weeks. Breeding goes well when you use
live food. Use heavy
rocks, they will clean them in order to lay eggs on. Large
driftwood could help this process too. Generally, they breed like all large South American cichlids.
This
article is available in German: PDF
Der Fisch Oscar.
Picture
Thanks to
Tamri Shavi!
Feel free to visit
Oscar Care Basics at firsttankguide.net too!
Oscar fish
has been viewed times since June 30, 2009.
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