Oscar Fish Adult Size: 14 inches (cm)

The Oscar fish is also known for its ability to bond with its owner and interact.
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johnnyphoenix wrote: Sorry to hear about your fish.

To me it sounds like something rather rare like either electrocution or some sort of toxic chemical getting into the tank...I can't imagine a large oscar having such a 'violent' reaction and dying so quickly without some sort of sudden and adverse stimuli. I would think if it had been some sort of ongoing infection or ammonia/nitrate buildup etc. you would have noticed telltale signs or behaviors well before.
Oscar fish belongs to cichlid family and are known by scientific name Astronotus ocellatus.
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Oscars will often investigate anything that takes their fancy inside the tank. My Oscars seem to take pleasure in bashing the hell out of one of the heaters. Why they do it is something I cannot answer, probably because it is not nailed down and moves around slightly. This following video shows an Oscar investigating a ping-pong ball that has been put into the tank. Oscars aren't the only fish that will investigate things that they can see floating on the surface, I have observed carp mouthing at floating objects, once they realise it isn't food or a threat, they normally leave it alone Oscar Fish Life Expectancy: 13 years
Photo provided by FlickrOscar Fish Habitat: Amazon River Basin
Photo provided by FlickrOscar Fish Minimum Tank Size:  55gallons
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Oscar fish are native to the slow-moving freshwater rivers and creeks of South America. They are a very popular aquarium fish and come in many beautiful colors. Oscar fish are strong, and can accidently jump out of the fish tank if they spot something above that looks like food, so be sure to use a tight-fitting aquarium lid with a latch for your fish. They can also pull up plants and even move rocks and gravel, but their antics will give you plenty to do cleaning up after them! Oscar fish are carnivorous. In the wild, they eat smaller fish, insects and pretty much anything that swims or flashes before their eyes. In captivity, feed your Oscar fish a prepared mix made for them and supplement their diet with crickets or meal worms. Be careful about other fish in the tank; if they are smaller than the Oscar, the Oscar may try to eat them. Oscar fish need a large aquarium tank. According to , one Oscar needs a 75-gallon fish tank with a good filtration system. Two Oscars may need a 125-gallon or larger tank. Oscar fish can grow up to a foot long, and need a large tank in order to swim about freely. are the result of breeding red Oscars with common Oscars. The result is an attractive aquarium fish with a dark brown-black base color and red stripes. Tiger Oscars vary in the amount of red or orange on the body, so depending on your color preference you can find ones that are darker or lighter in color. The common Oscar fish is a direct descendent of wild Oscar fish living in the fresh waters of South America. These are the ones you'll find most frequently at the pet store. You can identify them by their dark brown-gray base color with stripes of yellow, gray or pale green. The common Oscar does not have orange or has very little orange on his body. The veil tail or veiltail Oscar fish features beautiful long fins and tail. You can find veil tail Oscar fish in all standard Oscar colors ranging from dark to albino. Be careful not to overcrowd your Oscar fish when you have a veil tail, as overcrowding can lead to nipped fins, ruining the graceful, flowing look of the veiltail Oscar.