what is the smallest speices of piranha

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The smallest piranha in the Serrasalmus genus is the S. Sanchezi maxing out at very rarely over 7" in the aquarium. The smallest Pygocentrus species would be the red belly at rarely over a foot.

Brandtii, Altuveii, Crompressiceps, Spilos, Macs, are all commonly available fish that would reach no mroe then 10" in most cases.
 
Catoprion mento aka WIMPLE PIRANHA...These max out at 3-4 inches....
 
JD7.62;623912; said:
Dude chill out with the big font.

Wimples are not true piranha!
.. ya thats like saying a pacu is a piranha..
 
Wimples are not true piranha and a bit pricey but they are very cool fish in their own right, They are effective predators who make short work of small sized feeders, and while they tend to be a bit pale when young, they take on a nice yellowish to reddish undertone on their belly as adults, They are small enough that you can keep an adult pair in a 20G. They do need cover and good water conditions though, not a good beginner fish.
Here are two pics, one bt Stawikowski of a fairly young one, and one by Johnny Jensen of a full grown adult, note the neat finnage.

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