Why is my oscar not growing..

[Mightymouse1111]

Nope, I did not have them long enough to verify who could lay eggs and who could fertilize. Oscars are sexually monomorphic, meaning both sexes look the same, no breeding dress, no size difference. If it were a simple size difference, then folks would have been able to reliably figure out the sex of the oscars within the past 70 years of them being bred for the aquarium.

I hear ya on the sexual monophorphism as adults but I know I read somewhere online that males tend to grow faster than females when young. Just trying to find some a link there...

 

[Rocksor]

I hear ya on the sexual monophorphism as adults but I know I read somewhere online that males tend to grow faster than females when young. Just trying to find some a link there...

I haven't found that to be true. It's all about how aggressive the oscar is at eating plus genetics, not sex.