yeh crazy quickly...i bought mine at about 4 inches...after a year it was about 22 inches....pretty mad but i think i overfed cause it was my first RTC and i was so amazed at that bellly capacity
depends RTC useually gorw any were from fast to holy s*#t my ponds not ready yet they grow around 2-3'' a month and can grow to 2' in there first year if we'll fed and seem to need clean water or will devolope gill curl
lol, well let me think got mine 5 1/2 months ago at 1.5" and now it's 14-15". This is the fastest growing catfish I have ever had period. I've had other RTC but they didn't grow as fast as this one.