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.
Betta marble coloration.
Betta fish breeders have inserted a jumping gene also called transposons into the gene of a normal betta fish to create the marble betta fish variety.
Genes are responsible for a variety of things.
Marble coloration marble coloration in bettas is a result of a mutation known as a jumping gene this gene is able to move between the fish s chromosomes resulting in an ever changing color pattern.
These transposons are what make marble bettas notorious color changers.
Marble coloration this color change is caused by a jumping gene which can make the betta fish change color multiple times in his lifetime and may even change his colors completely.
But instead of having 3 colours in a marble effect there is only 2 colours on the body.
Marble bettas are just as healthy as fish without the jumping gene but may experience a variety of color changes throughout their lives.