Hi! I got my male betta (Bob) from a local fish store here. They simply labeled him as a “koi betta”... I’m new to bettas so I don’t know what kind of betta he is >< help!!
As the others have said, Plakat Koi Betta.
His species is Betta splendens.
Plakat is a short fin fish.
Koi is the colour pattern that resembles Koi carp.
@essjay does make a good point, the term, “Marble” is used to describe a type of betta fish by its physical blotchy appearance but more importantly by the special genes they have called, jumping genes or Transposons as they are now called.