Yes the females do have that extension too although not as extensive as the males.
Bill, if you're reading this, this female was the one I spotted at the LFS some time ago. The wild type "tiger" lineatus.
It comes as no surprise that feral/introduced populations of this species is present in Singapore as the aquarium trade produces thousands of this species for sale in export markets. There would have been a few escapes or deliberate releases thereby causing such a population to exist.
My only wish is that this species will not outcompete the native Aplocheilus panchax.![]()
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