Originally Posted by Bormsby17
I have four gouramis. I have a feeling they are all males, because all they do is chase each other around the tank. There is no bubble nest established.
I have attached pictures. Does anybody know how to sex them? And can the different types of gourami breed?
It looks like you are right, they are all males. The Dwarf is a male based on his coloration. Female dwarfs don't have that coloration.
As for the Gold and Opaline, Males have a longer more pointed dorsal fin whereas the female's dorsal is smaller and more rounded. Females also carry their eggs which makes them have a much rounder appearance in their midsection.
As for can they interbreed? The Gold and Opaline are both color morphs of the original Blue gourami so yes they can and do interbreed. However, you are not really breeding different species like you would be if you bred the Dwarf to either the Gold or Opaline. I have not experienced that ever happening.
Hope this helps