knifegill;4055404; said:
This is new information. Any other references to support the idea? I would enjoy believing this to be true.
lol, I found a link or two that supported the idea, but then it's a mix of things. Can't be determined by looking at them, can be, females are more colorful, males are more colorful, etc.
What I have found out with MY experience with Oscars. The female I got three years ago an 1". As she grew she grew long and slender, and stopped a year ago at 12". How do I know that it is a female? She has a large 'vent'.

Now, the male is a rescue, apparently was purchased 4 years ago at 2", and grew to 14" over time. When he stopped or if he is still growing? Not sure. How do I know that it is a male? You can't even see the 'vent' unless I took him out and really tried to find it, lol. He is 'taller' in height then she is. She must be 4" high and he has to be 6" high. Now, I have had people say, "Maybe the male grew up in a larger tank than the female, and therefore grew larger!" Nope, both have been housed in a 55-Gallon all their life, although the male is in a 60-Gallon, soon to be a 90-Gallon.

The male also has more red coloring around the face then the female does, and I believe that they are both "Common Oscars" although the previous owners said he was a Tiger, but I just don't see it. And the male is MUCH more aggressive. Attacks his own reflection randomly, as the female does not, lol.
Anyway, that's what I have been able to observe.