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[Breeding them requires plenty of water changes 3 or 4 times a week]

Nonsense! Breeding them will not be successful without first determining male and female. Piranhas in genera Pygocentrus are not sexually dimorphic. So it is the roll of the dice if what you suggest facilitates breeding. I have receive numerous emails on this topic from hobbyists who think that I have a magic formula for making fish spawn. If one can afford hormone injections then your success rate would quadruple. Instead, study your piranhas carefully, look for nuances that might suggest breeding attempts such as; coloration darkening (suggesting a male), tail slapping and nest building. The male will generally always be the aggressor. The rest could just be in your imagination.
 

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Frank told me that Ternetzi were bred by a guy that lives near me.
What I actually told you Nate was that the yellow form P. nattereri the fish you keep calling ternetzi was bred in captivity.

The list presently lists the following;

P. cariba - hobbyists
P. nattereri - hobbyists, public aquariums
S. spilopleura - hobbyists, public aquariums
S. spilopleura CF - hobbyists, public aquariums*
S. rhombeus - public aquariums

*S. spilopleura CF is member of the complex of 5 species which closely resembles each other. This particular species bears a resemblance to the Venezuelan S. medinai it has not been verified this species outside of Venezuela is indeed S. medinai though hobbyists are using this name with some frequency.
 
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