Oh dear... Well I had a female siamese fighter sold to me a while back, around 3 months ago I guess. It has been living happily along with some neons for the past month after the male siamese fighter died. I am not sure why he died, he was quite happy then the next day he was at the bottom of the tank. He didn't have any chunks of fins missing etc, I think I might have hurt him when I cleaned the tank but I can't be sure. It certainly didn't look like he had been fighting.
Anyway, I have just decided to introduce a new male fighter and basically as soon as I put him in the tank the 'female' attacked him and he attacked back.... I've put a floating breeding chamber in the water and placed the new male in there so they can't touch each other but they are still trying to have a go although they can't get to each other.
I'm a bit concerned that my female isn't a female and might be a male plakat (having read the threads on this forum) i've taken a couple of photos, they aren't great quality but I hope they are good enough for you to help me out.
The 'female' betta really manages to puff the gills out as much as the male and is just as vicious, if not more so because 'she' is an adult and he is still quite young
Here goes!!
Anyway, I have just decided to introduce a new male fighter and basically as soon as I put him in the tank the 'female' attacked him and he attacked back.... I've put a floating breeding chamber in the water and placed the new male in there so they can't touch each other but they are still trying to have a go although they can't get to each other.
I'm a bit concerned that my female isn't a female and might be a male plakat (having read the threads on this forum) i've taken a couple of photos, they aren't great quality but I hope they are good enough for you to help me out.
The 'female' betta really manages to puff the gills out as much as the male and is just as vicious, if not more so because 'she' is an adult and he is still quite young
Here goes!!

Its definitely got the same fin shape as the blue male plakat you show on the link and its gills puff out just like a male betta. The ventrals aren't quite as long as the blue plakat in your image though but everything else points me in the direction of it being a male plakat... 