Pound for Pound toughest fish?

[woodyoz]

a snakehead will kill anything

 

[a_c_arnold]

The thread says no poison, but didn't mention electricity. I'm going with an electric catfish. A human has to watch out for those.

 

[ALLafricancichlids]

my oscar killed my RD

 

[ALLafricancichlids]

for the size, betta

 

[Nicksplosion]

a giant snakehead because of its will to survive or a tarpon.
just my thoughts

 

[Perciformes]

I want to see a 2' bowfin vs a 2' snakehead, even money?

I want to see a 2ft sh vs 2ft marble goby would be intresting.Speed and teeth against anbush and mouth.

 

[Thedaniokeeper]

Is this FW or all water types? If all, than probably some type of shark.
If FW, then I would say bettas or SH.
70kg Betta vs. 70kg SH.
The SH. The betta would be to fat to move.

 

[voss345]

BLue fish, they are hella mean, imagine them pound for pound against a shark or a barrucuda, they would maul

islantum they stay fairly small and are nuts

 

[channarox]

I want to see a 2ft sh vs 2ft marble goby would be intresting.Speed and teeth against anbush and mouth.

a goby wouldnt even fight back...
or maybe flare abit.

 

[Perciformes]

a goby wouldnt even fight back...
or maybe flare abit.

Not a true goby its part Eleotridae family witch contain fish called sleepers.