I wouldn't say anything is ultimate. But more of what conditions they specialise in.
For Gatf's, they thrive in Rapids and have the speed, which is perfect for that kind of conditions.
For catfish, mostly they are ambush predators and have feelers to "smell" prey in dark and murky waters. Huge mouth to engulf the prey before they get away.
For Snakehead, they are easily adaptable, have the attitude and really thrive when given the chance.
What im saying is that everything is the ultimate predator as they specialise in specific conditions that they adapted to.
Sent from my GT-I9100 using MonsterAquariaNetwork App