Oscars Spawning

I recently posted an article with the subject Spawning Demspeys. Well this
morning when I went to check on the Depseys I notice the pair of Oscars
have spawned as well - on the other side of the tank.

I did not notice the eggs yesterday when I did a gravel vac (I might have
missed them) so I assume they were laid over night.

Unlike the dempsey eggs which a re a translucent yellowish colour, all the
Oscar eggs are uniformly white. Since this is the first time they have
spawned I would not even have known if I had a female Oscar or not.

I have alwasy understood when eggs go white they are non-viable. Since all
the eggs are white ist it correct to assume that they were not fertilised
becasue a) the "male" is shooting blanks or just did not bother or b) the
"male" is actaully a female and whoever laid the eggs did so out of a
response to another species of fish doing the same thing. Or are Oscar
eggs white to start with?

Thanks

Trev