Ideally if you keep them in a bowl or a small container, it would grow to a max size of 5cm body size. I had once seen a fish which was around 7-8cm long with 2 -3 cm fabulour tail.
2 feet
A Betta Fish or Siamese Fighting Fish are only a few inches. The females grow to about 2.5" and males grow to 3".
it depend upon on ur fish tank if big fish tank it can grow fast !!!!!!!!!!!!
They have to grow up and be adult before they can breed
they are born with them if they don't have them then they are going to die :(
No
There are no fighting fish that come from Japan. I think you are asking about the Siamese fighting fish (Betta splendens). They do naturally have a round stomach almost like a ball. That is their body shape.
The average is 1.5 inches
big
it depends on how big it is if it is a goldfish or beta it can be in a bowl.If it is one of those big tiger fish or aqarium fish then put it in a big tank. A fish will grow to the size of the tank or bowl. For instance, say a goldfish is in a tank, it will not grow as big as the tank; however it will grow big enough to be able to swim in their environment. The fish will not overgrow the tank. I had a six inch goldfish in a thirty gallon tank.
Porcupine fish can grow to over a foot long.
Viper fish can grow from 30-60cm(12-24 inches).
As big as brendan james marshalls dick (2cm)