Serrasalmus rhombeus

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10" Jeffrey 4"Jack 6" un-named guy. I also have a elong and some reds.
 
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ArttyFish said:
Yeah all Rhoms are considered Black Rhoms. But hobbyist seperate the different types by Diamond scales and general rhom color. If you look at photos of lots of different rhoms you can see some are dull, some have bright specs of scales they call diamonds. So there is Black Rhom, Black Diamond Rhom, Gold Diamond Rhom, and my Blue Diamond Rhom which i have seen. Most will say they are the in the same Rhom family which is true, but the prices on each variants are different. Blue Diamond Rhoms usually are more expensive because some people say they are prettiest.
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Sent from my E15i using MonsterAquariaNetwork App

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interesting chart, and great rhoms everyone
 
The identification of piranha is very difficult because there are many common name(nick name) make it confuse.
Moreover many study show the different aspect interms of classification.
This study make me clear !!!!!!!! ..................http://www.aquariacentral.com/articles/bpiranha2.shtml
My conclusion are ( May be wrong)
1 Black piranha and white piranha are the same species which refer to Serrasalmus rhombeus. The different of color is result of the size of fish and different of river.
2 Black diamond rhombeus or Blue diamond rhombeus (common name) are similar to the Serrasalmus rhombeus but they are not Serrasalmus rhombeus. Diamond rhombeus is refered to Serrasalmus spiropleura spicies. This species has sparkle scale than Serrasalmus rhombeus(black piranha). I do not know which one is rare. But in Thailand there are alot of black diamond rhombeus, i have never seen the S. rhombeus.
 
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