it is just a distinct body shape, here in Asia, king aro or semi king are collectable. They can either be a high value or less, all depends on the anatomy of the fish. A wider body shape or else sumo type, and short body are more popular than regular arowana. Perhaps because of the high number of standard and low quality arowana here in the market that makes people turn to these type of arowana. I bought this fosh because I like the way it look, and I am curious about what the body shape look like as the fish growing. You could see from the above pics how the hunch develop as the fish mature.