An animal lover released hundreds of colourful koi fish into a pond in his backyard. Wally Casuga built the concrete pools in his property to breed tilapia but saved a cage for his pet carp in ...

Despite their dual name, koi betta fish are regular bettas with no koi genetics. What makes them special is their gorgeous marbling, reminiscent of the colors on a koi carp. Koi betta fish were ...