I just kept them for 2 months in earthen pond. I was buying 7 pcs but 1 died, size when purchase was 2.5 inches but now (Aug 17,2011) they are 6 inches (including tail), probably around 0.3 kg weight each by now. I kept them together Mekong Giant Catfish (Pangasianodon Gigas) and common carp! The growth rate of Giant carp is equal with common carp as I also bought common carp (cyprinus carpio) with the same size. Perhaps within 6 months, when common carp slower growing then the giant carp will exceed the size. The reason why I kept those 2 giants because I want to break world record of LARGEST FRESHWATER FISH!
The nominees are Mekong Giant Catfish (said max length 3 m and max weight 300 kg) and Giant Siamese Carp (max length is 3 m but weight is unproportional 300 kg)
If the length of Giant Siamese Carp is 3 meters then it should weight 600 -750 kg!
I kept them in my earthen pond in Indonesia, hopefully can reach 3 meters within 15-20 years, then I will invite all members here to watch....
Cheers