pound for pound, what do you think of THIS idea?:
say the fish knew they where in a fight, a TEAM BATTLE of 1 wolf fish + small Gator Gar + Snakehead Vs 50 juvenile Super Red Piranhas with a combined weight matching the three??
consider the 50 super reds as 1 contender since their team players anyway. they remind me of a swarm of bee's in the cartoons and the opposing fish must beat the whole, though each individual is small and inferior against its opposing predators.
The battle takes place in a 20,000 gallon pool with underground viewing glass
the winning team is determined when all 3 mega predators are taken down / all remaining piranhas are no longer attacking.