name this animal

ok, Denamic, now I want to know if you reallly know about animals.
name this animal:
(all images, of course, are the same animal.

tip: this animal only exist in BRAZIL.

have a lot of then in here. Is very sociable .

They are very annoying too. If they see you eating, they want to take the food of your hand. They eat anything, even a man if the man are dead... :cry:
 
ok how about this, I'll give a few clues.
It's a tropical fish....
Its named after a type of fruit...
That should make it pretty easy^^

apparently not easy enough


ITS A MANDARIN FISH..........