yellow bellied piranha? info for a noob please

[teabags]

so i got 2 yellow bellied piranhas can someone gimme some info on these beasts?

 

[noga]

its called a gold piranha .... Serrasalmus Spilopluera is the scientific name

 

[_Sushi_]

Or it could be a yellow Pygo....which is equally as possible

How big are they? and if you have one, post a pic.

 

[x-J-x]

yellow belly?...could be a tern or piraya..

 

[akskirmish]

Yep could be tern,Piraya,Mac/Spilo...

Need pics to determine species

 

[_Sushi_]

would it be more likely to be a piraya than a tern, if it was a pygo?

And don't Macs only have yellow on the anal fin, instead of a yellow underbelly?

Just trying to get all my info straight.

 

[Curly68]

Tern's can be yellow or even a slight green tinge! Macs do have yellow on the anal fin usually but also can have yellow colouring around the head/belly area.
Would need a pic to be able to identify.

 

[StIcKy~RiCe]

if it Serrasalmus could be a gold mac or gibuss

if it Pygo could be tern or piraya.

 

[BigShawn]

Pics. please..........

 

[yellowtib]

Heres a list of different piranhas
http://www.aquascapeonline.com/prodList.asp?idCategory=22