piranha sexing question

[mightykoreanboy]

hi! do u know how to sex piranhas? and does their sex affter their maximum size?

 

[sleepyflight]

cover your finger in blood and stick it in its mouth....j/k
I would assume vent sexing would work, then again I've never had P's

 

[boredcpl]

i was always told the only way to tell is when they pair off and start breeding..

 

[Serygo]

no...
The way to sex piranhas is by their anal fin..
I have not figured it out which one is what.. but whenever you see piranhas mating you always see the anal fins are different...
Some are hooked and some are more flat.
I was told this method of sexing them by a old friend that owns one of the canadian fish retailers.

 

[piranha45]

I've never heard of them being sexable, personally.

 

[DanDanUK]

Sexing Piranhas !

You do sex them by there fins but it's not there anal fin it's the cauldal fin ! On a MALE, The bottom half of it's cauldal fin is a lot more longer and pointed, Where as on a FEMALE the cauldal fin is slightly smaller and the top and bottom half are equal is size they are also more rounded than pointed.

But the best thing i have found is to buy a load of them as young and let them pair off because it's impossible to sex them as they are young.

 

[Serygo]

No affence, but thats either wrong, or all my piranhas were female.

which my two red bellies did mate (by your post above, were both females)....

 

[NIKE]

almost all of the piranhas are NOT sexually dimorphic. watching them breed can narrow it down as females are usually bigger and have a buldge in the mid section. Pygopristis denticulata
ARE sexually dimorphic males have a biloped anal fin.

 

[mightykoreanboy]

do grow to about the same size?

 

[guppy]

The ones in high heels and lipstick are the females.
Sorry, I never could tell.