HOW DO KNOW WHAT SEX OF A TIGER OSCAR ?I HAVE TWO TIGER OSCARS IN A 110 GALLON TANK THERE P.H IS 7.0 0 AMMONIA ,0 NITRATES ,0 NITRITES.I HAVE HAD THEM FOR ABOUT A YEAR NOW ,THERE ABOUT 9 INCHES LONG?AND THEY FIGHT ALOT SOMETIMES AND THEN ARE ALL LOVEY.
There really isn't a good way to tell. Male and female oscars look pretty much the same. The only sure way to tell is to watch them when they breed to see which one is doing the egg laying.
No matter what anyone tells you, you can NOT sex Oscars. A female Oscar will lay eggs even without a male present..I have a beautiful Tiger myself..a lot of people say "Well, you can sex them by thief fins"...not soo. Have a good day