Cam wrote:Read this article and others quoting it and had to email the author
in regards to successful breeding of S.Rhombeus in captivity,..the
author is credited to 20yrs aquatic experience,..i will post the
email when replied,..very interesting,..have read another article
with a brief reference to 2 successful accounts of breeding S.Rhombeus
in captivity,..very interested to hear if this author has a link
to share with more detail or better yet a personal account,..
Article stating successful breeding of S.Rhombeus twice,..
I don't believe that you can breed rhombeus in 100g tank. unless you already have a breeding pair paired up and just move them to a 100g tank for nesting purpose.
first you'll need enough number of rhombeuse to increase the chance of having enough male and female to form breeding pair(s), second as we all know that rhoms needs to be kept solo in home aquarium unless the tank is big enough for them to each have their own territories without killing each other, which most of us won't be able to provide that amount of space at home dedicated to just a few piranahs. when you put these two reasons together you'll be nearly impossible to breed rhombeus in captivity. even if you do get a pair of male and female together there's no guarantee that they will pair up and breed. The only one case that I can remember was a breeding colony of rhombeus were found in abandoned pond/pool in Florida, if remember correctly it's like over 1000g. I think I read it some where on www.opefe.com
here's the link www.opefe.com/rhombeus.html
"RELEASED AS A NON-NATIVE
S. rhombeus has the dubious distinction (along with Pygocentrus nattereri) of being the only two species of piranha introduced in Unites States waters. In Florida (1977), a breeding population was discovered at an abandoned amusement park (originally misidentified as S. humeralis) in Dade County. They were found in an over 1,000 gallon outdoor pond where they reproduced. Even more interesting, the fish survived during Florida's winter. Preserved specimens from the Miami area were deposited at University of Florida UF 87975, UF 97059 ) and were determined by W. L. Fink University of Michigan [personal communication between Leo Nico Florida DNR and W. L. Fink, Voucher specimens: Florida to be S. rhombeus and not S. humeralis."
besides, even you do have a tank/pond big enough you may not want to waste all those cash on buying large size rhoms(so that can be sure they are full matured and ready to breed) and have a great chance that they will kill each other.