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Oscar fish breed naturally without any help. However, if you want to breed the Oscars for business development, extra attention should be paid. Things must be well thought through in advance, to avoid ending up with many fish with which you can't do anything, considering that a pair of such fish can produce even 1000 eggs that may all turn into mature fish.
The male Oscar fish and the female Oscar fish look the same, as they are monomorrphic fish, which makes it more difficult to distinguish the male from the female. The only way to tell the sex of an Oscar fish is by observing which one lays eggs. No other signs indicate that, contrary to what some people say. The easiest way to get a male and a female is to ask someone who already has a mating pair to give it to you. Or you can buy more young Oscars and wait for them to pair, so you can detect which is what.
The growth of your Oscar depends very much on the conditions he is being raised in, including food, the size of the tank and how much you look after it. An Oscar raised in a 300 gallon tank will certainly grow bigger than one in a 125 gallon tank. This is why size is not necessarily an indicator of the fish's maturity. They only pair when they reach their sexual maturity, which usually happens after the age of one year.
The moment an Oscar fish starts to lay eggs, you can be sure that you have a female and a male. The egg tube of the female has an oval shape, quite similar to the normal egg's pointed end, while the sexual organ of the male looks like a thorn, having a pointed shape.