Most aggressive freshwater fish?

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Probably electric eel, pike/musky, almost any bass and (European) catfish.

Depends on what you mean by most aggressive i guess because those will eat anything that fits but most of them wont hurt humans.
 
Insofar as tolerance of other fish, green sunfish are extremely aggressive towards anything with them.
Umbees are rather violent as well
 
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Probably electric eel, pike/musky, almost any bass and (European) catfish.

Depends on what you mean by most aggressive i guess because those will eat anything that fits but most of them wont hurt humans.
Electric eel are not that aggresive. They just have the tools to hurt other fish very easily and make them crazy with their constant electric pulses. But they don't seek conflict with anyone, neither their own or other fish.

And Wels are for some reason rather softies in captivity, in the wild they can be "aggressive" when hunting or defending their nest, but I would not compare it to cichlids or aimaras. If a Wels acted like that in a lake there would be noone swimming anymore.
 
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Electric eel are not that aggresive. They just have the tools to hurt other fish very easily and make them crazy with their constant electric pulses. But they don't seek conflict with anyone, neither their own or other fish.

And Wels are for some reason rather softies in captivity, in the wild they can be "aggressive" when hunting or defending their nest, but I would not compare it to cichlids or aimaras. If a Wels acted like that in a lake there would be noone swimming anymore.
I never knew that about the Wels being softies in captivity, ive seen only a couple in the wild and ofcourse what ive seen on videos and such, i expected them to be quite aggressive in captivity too i guess.

Ive even heard some stories about soke peoples small dog being grabbed from shores by catfish, but when theyre well fed theres no reason to be like that i guess
 
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