Pound for Pound toughest fish?

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I haven't kept many aggressive fish. I have a little (7cm) Sooty Grunter atm which will attack anything that goes in the tank ie my hand, floating bit of driftwood 1.5ft long, siphon etc. But from what i hear these are mild compared to a Mangrove Jack, so thats where my vote goes
 
rumblesushi;41945;41945 said:
in a tournament of the best predatory fish around, all weighing the same - who would you fancy?

It's fairer to do it by weight, like boxing, for example a 12 inch rhom is gonna weigh significantly more than a 12 inch senegal bichir.

Also I know that fish are not robots, it does come down to the individual - just how aggressive, pugnacious and tough they are.

For example my red snakehead was extremely aggressive even for the species.

Not only would it attack your hand if you stroked the tank and go for your fingers if you went around the top of the tank, but I once tried mixing it with fish the same size to see if anything could live with it. I tried 2 fish of equal size and it ripped them to shreds as soon as they arrived (seperate occasions).

And it was not even hungry, it was very well fed on beefheart, shrimps, goldfish etc.

Yet my pirhanas were not aggressive at all. A goldfish could live for days in that tank, they seemed to prefer dead food. And if i put my hand in they would do nothing.

So let's say we take an average specimen of each fish, not one that's unusually aggresive or timid.

Who would your money be on? (excluding poisonous fish, has to be a fair fist fight (well mouth ;))

I guess the contenders are red snakeheads, wolf fish, african tiger, possibly a rhom? Lungfish?
Alligator gar will kill anything in its weight class.....anything, they eat bowfin, largemouth etc.
 
I dont know about most agressive but I had a big wolf fish that successfully killed anything I put with him, snakeheads , cichlids didnt matter he tried to eat them all...
 
Yeah the wolves are def. at the top, with the number one spot held by an adult Aimara. The Alligator Gar is a BEAST but the only thing I could put in its category would be the Super Large Catfish or Arapima which dont seem aggressive their just so damn big they eat pretty much what they want. Its more of an eating drive not pure aggression. Not all but alot of the Larger species Wolves, Snakeheads, and Cichlids are simply tough and aggressive fish with attitudes and will kill outside of being hungry. Of course every individual fish is different...just my .02cents.....;)
 
A full grown black piranha...extremely aggressive as they get older. When it all came down to it, there would probably be about 10 species that would probably come out on top during different encounters.
 
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