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Only your own years of experience will help you to guess the age of any fish including Oscars. They get to full size (about 14 to18 inches) in around 2 years or so if they are well bred fish and correctly looked after.

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14y ago
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15y ago

12/29/08 - I have an Oscar that is 3 years old and about 8". Someone elses answer:They can live quite a few years! The ones I had didn't live very long. The bigest one killed all the others, then he died shortly after He was about 8 to 10 inches long and about 8 monthes old

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14y ago

The life cycle of all things is basically the same. Development from a fertilised egg into an embrio. Deveopment of the embrio into a baby, development of the baby into a mature adult. Procreation (produce a fertile egg) then decline until death. We all do it.

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11y ago

It can range anywhere from 10 to 20 years depending on their care

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12y ago

If I recall correctly, Oscars (Astronotus ocellatus) live for anything from 5 to 20 years. I suppose that it all depends as to whether or not they have been provided sanctuary and sustenance

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13y ago

Oscars grow about 1" a month in it's first year of life, so can easily get 10"-12" in a year. They slow after that but should be full grown at 2-3 years old, that's around 14" long.

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15y ago

3 to 4 months

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Q: What is the life cycle of a Oscar fish?
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