Feeder fish should never be used. Lifespan for Oscars is around 12years, so yours aren't especially old, and therefore old age isunlikely to be the issue.>
my friend bought me some oscars for my birthday, and i was totally ..
The oscar is a species of fish from the cichlid family known under a variety of common names, including tiger oscar, velvet cichlid, and marble cichlid.
Scientific name: Astronotus ocellatus
Lifespan: 10 – 13 years
Mass: 1.4 kg (Adult)
Length: 36 cm (Adult)
Higher classification: Astronotus
I bought my large oscar so i never seen it grow up from being a baby
Oscar Fish Tank Size : 75 gallon or larger. Care Level : Easy, good for freshwater beginners with a large enough tank and those with an adequate aquarium filter and those willing to perform frequent partial water changes. Size : 13 inches Temperature : 72°F - 80°F pH : 6 - 8 Hardness : 5° to 20° dH Lifespan : 10 - 13 years Tank Region : All over
Tiger Oscar Fish Care - Food, Facts, & Behavior - YouTube
A big fish can take a lot of punishment. They can shake of maltreatment (albeit with other consequences, such as HITH) to a much greater degree than a little one can. Younger fish also have more to lose - if it doesn't grow properly (stunting due to poor water quality, for example) it will live a much-shortened lifespan and may never be able to handle diseases well. It's no secret that more water per fish = better water quality with the same amount of work. I dare say that because of this, a young fish needs more space than an adult fish of equal size (a three-inch oscar needs more water than a three-inch convict). (NOTE - I am in no way implying that you should maltreat your adult fish! There is an immense difference between surviving and thriving, and every fish deserves the best of care that we can manage)Oscars are probably the most popular South American cichlids in the aquarium hobby, and with good reason. They are attractive, large cichlids that interact with their owners from a very young age. With multitudes of color morphs available, there is an Oscar to suit just about anyone. Often acting more like a dog with fins, Oscars soon steal the heart of anyone that falls for that cute little "Take me home and love me!" dance that most juveniles will display in the tank at the local pet shop. Unfortunately, this outgoing personality can lead to problems for many people who buy Oscars, unprepared for the size these fish can obtain. Many pet shops have tanks full of full-grown Oscars than have been returned once owners realize that they are unable to provide them with the tank size these fish require.
Oscars are highly intelligent fish, each with its own distinct personality. At times, they can be likened to a young child, with all the mood swings and temper tantrums that go along with that. They have a long lifespan, 15 to 20 years, so if you are planning on buying an Oscar, you should be prepared to a life time commitment.
In the wild, Oscars claim large territories and years of tank breeding has not dulled that instinct. Don't be surprised if your Oscar decides that the area around the tank, for several feet, also belongs to them. An Oscar will react quite strongly when an unknown or potentially dangerous creature, such as the cat, enters that space.