arowana
Inside their Abdomen and after giving eggs they keep eggs on Leafs.
Arowanas are one.
it eats their young/it keeps in their mouth
Bettas and goldfish
Breathing.
no ... when fish are borned thay has a bag that is full of eggs and when it grows another fish comes and kiss in the mouth and breakes the bag ,the eggs come out and grow .
Arowanas are mouth breeders, that is, the male will carry the fertilized eggs in his mouth and protect the young once they hatch. See the link below for a good overview of this fish's reproductive habits.
Catfish : a father sea catfish keeps the eggs of his young in his mouth until they are ready to hatch . Frog : the male Darwin frog hatches his eggs in a pouch in his mouth .
fighting fish
There are several, Chichlids, Apogonidae, Ariidae, Jawfishes, Osteoglossids and Gourami
she goes up to the male stone fish who then starts to bite the tail of the female then the females baby eggs come out of the mouth