Black belly of redtail catfish

[Alejandrolinares]

All the redtail catfish i saw in aquariums has a black belly abd two white spots on top , but in the wild i always see the redtails catfish with white belly and never has the white spots on top
Ant answer why?
Thanks

 

[moe214]

That's just genetics, could be a juvenile thing as well.

 

[dazzapolypterusweeksii]

Most if not all baby rtc have the 2 white dots at the top next to the fin which they all loose quickly as they grow and as for the black belly it can vary from all black to no black below the lateral line which i thing is the most attractive