And you can see it's almost serrated there.

Yeah, so much for that.

I'm goingto have to think again.

I'm switching to my most robust lures plastic and varnished wood.

But drawing these fish out of such turbulent deaths is going to be hard on hazardous work.

Yes, yes.

Getting a hold on the river tigers Bony jaw is one thing.

Keeping it there is another.

Uh, I'm finding out why some consider El Dorado the greatest fighting fish in fresh water.

I'm having no problem getting their attention.

But keeping the hook in there Impenetrable jaws is turning out to be a monumental challenge.

Okay, uh, Royce fish go away.

It's time to think again.

Uh, another approach is called for, I think as the lights starting to go, it's time to get off the water.

The next morning, I'm ready to start the battle again, but the conditions of our hunting ground have changed.

Damn.

Isn't generating as much power today.

Operators have cut the amount of water coming through the turbines.

The water's gone down quite dramatically, and what it's done is exposed all these rocks here.

So those are just perfect ambush spots for predators.

Just a rock to hide behind a little little slack water, some prey fish struggling in the current.

Whether this will work to my advantage, I've yet to see.

I've seen a little bit of activity.

Come on, entice them onto this has brought me color off plastic.

Yeah, and if I can or will I be able to set the hook in the rock hard jaw?

But in our hearts beat, something's changed.

The fish just stopped responding to my lure down below, but I spot something moving on the surface.

Oh, accomplish off.

Well, it's half a catfish.

They are still alive.

It's just bean being severed on.

You could see something chopped.

There something shop there.

I'm looking for a creature that can inflict a sheer like laceration on amputation by guillotine.

And I think I've found the evidence I need.

I'm just I'm just mentally comparing that Thio a certain part of the human anatomy.

This is actually a bone down the middle.

It's got It's got a vertebral column.

It's severed through that.

That is pretty gruesome and pretty impressive.

The perpetrator is somewhere right beneath me in the shadow of the dam.

I have to strike while the iron's hot.

If it's half the beast I've heard it is, it's still going to be hungry.

Fish on?

No.

With every leap, it's virtually Impenetrable.

Jaws threatened to throw my hook.

Yes, with a head like a pit bull, this massive beast weighs in at more than £40.

This is it.

This is a serious size fish.

Just look at that head.

Look at the teeth on DDE, the size of the jaw muscles that are going to be inside that gil flat there, a bit like bolt cutters.

Really, those jaws, particularly near the angle, Tremendous power.

I've opened the jaws of much bigger fish without a second thought, but there's no way I'm going to try and manipulate this slippery monster's mouth.

It's actually making me think of a spring loaded man trap.

It's not so much the size or sharpness of the teeth.

It is sheer force that you've got operating on these jewels, and if you're in any doubt, you only have to call to mind the catfish sliced in half Any part of human anatomy that gets in those jaws once you're in it.

You're not gonna get out.

I've seen the bloody mess it's inflicted on people along the river.

Now I have no doubt that a Dorado had the speed strength on hardware to slice through Vlasios.

Ferocious encounters I've uncovered teach a harsh lesson to the people living along Argentina's river of blood.

Down.

Their deal is very simple.

You either eat or you get eaten.

It's a bloody food chain that mostly happens out of our sight on beyond our awareness.

But get on the wrong end of that food chain and you'll be very aware off with bloody consequences and for that reason, which it'll fervently hope and take care that we never find ourselves in the wrong place at the wrong time.