I was told by the store assistant that the blue Siamese fighter I bought 1 month ago was female. I've tried to attach a photo but I don't know if it will be accessible.
She is doing great, very healthy and has a great personality.

However 2 days ago I introduced a beautiful red male fighter. I found him dead this morning. He had been ravaged. All his fins were gone and he looked really awful. He was twice as big as my blue Betta.

Can someone tell me was this some disease perhaps or is my female actually male???

Besides the fins is there any other obvious way to specify gender in Bettas???

Thanks in advance for any advice you can offer.

Attached Images

 

it look like male to me

shd b male

Looks like young VT male

it is indeed a male lol..

btwn, carben,
u put them together?

Bettas are very territorial fish! The fish in the picture is a male because of the vibrant colour and big fins. Female bettas have muted colouration and/or vertical stripes on them.
When you put 2 male bettas in a tank , they will fight for the space hence one will end up dead. They fight for space by flaring up their colourful fins and swimming into the other fish. Their gills also expand. It sometimes happens when a female is introduced to a tank with a male in it. I dont know why he attacks her
The best thing is to partition the tank if possible or seperate tanks but 2 males in a tank is a recipe for disaster.
Hope this helped.
Franco