Yellow-Fin Tuna Deadly 60 Bites


Yellow-Fin Tuna

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On Deadly 60 I've had loads of incredible animal encounters.

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Here's just one of my many favourites.

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We're skimming over chilly South Australian seas.

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Around about here.

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Although my crew's about to take off at the moment!

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Stick with it, guys.

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Today's animal is deadly because it's quick.

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You're looking at the fastest fish in the seas.

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They're all submarine speedsters,

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but the fish I'm after is turbo-charged,

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clocking up speeds of over 70km an hour.

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Ladies and gentlemen, I give you...

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the tuna!

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But first, a bit of Deadly 60 science.

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The big enemy of anything trying to travel fast in water is drag.

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That is the force of the water holding you back

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as you try and move forwards.

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To get around that you have to be streamlined.

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In the air that's aerodynamic, in the water hydrodynamic.

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The tuna is just about the most perfect example

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of a hydrodynamic fish.

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I, on the other hand, am not that streamlined.

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So, theoretically, if I was to get in there and try and travel fast,

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I should be hammered by drag.

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So, we already know that tuna can travel up to around 70km an hour,

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which equates to about 38 knots.

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OK, Captain, hit it!

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You can see as we start to build up speed,

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automatically the water's pushing back against me

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and I'm really struggling to hold on.

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I'm actually already losing my trunks!

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What speed are we at, boys?

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That's 4.7 knots, Steve.

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Well, I've still got hold of the rope but I've only just got...

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How fast now?

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What's that?

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6.8.

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Aaah!

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-I've lost my trunks!

-Lost his trunks!

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This is not good. I hope you can't see my bottom!

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OK, so we're now going about a tenth of the speed

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that a tuna can go full whack.

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It's almost pulling my arms out my sockets!

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And I'm absolutely naked!

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Ha-ha!

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How fast's that, Mark?

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-Seven knots.

-Seven.

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No! That's rubbish!

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-Switch faster.

-Aah!

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He's gone.

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He's gone, Mark, he's gone.

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What's that?

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See you, Steve!

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Bye, Steve!

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-Bye!

-Bye!

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He's got a nice bum though, hasn't he?!

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Yeah, I noticed. He must work out.

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What was our final speed when he let go, Mark?

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8.5.

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8.5, oh, he did quite well.

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Not bad for a beginner.

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I think that pretty much proves that unless you're streamlined

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you ain't going nowhere in the water.

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And it also proves why fish don't wear swimming costumes!

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You better not film this when I try and get out the water.

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So, so far we've proved that I can't swim.

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As well as a tuna!

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But I can't dry off yet

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cos I still wanna get in the water with these amazing creatures.

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Growing up it never really occurred to me that the fish in these tins

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are some of the most special and some of the fastest in the seas.

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Unfortunately they're prized as food which means they're becoming rare.

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Fishermen, attempting to make sure they don't become extinct,

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have started keeping tuna in these big nets,

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giving me a unique opportunity to get close to them.

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There are lots of different types of tuna.

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The ones swimming round in here are about as big as me,

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but the biggest ever was heavier than a horse!

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This is extraordinary! There's hundreds of them.

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Each one of these tuna weighs almost as much as me

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but they swim effortlessly.

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Just gliding past me.

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They're barely swimming, look!

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I feel like fish food!

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Look at that!

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Being up close to them under water

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makes it easy to see why they're deadly predators.

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They are the perfect shape, nothing sticks up off it to slow them down.

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So they move with just a flick of their tail.

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Awesome! Ha-ha!

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Luckily, tuna fish eat small fish like sardines.

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If I was a sardine now, I'd last about a second.

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Tuna accelerate faster than a sports car.

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And they've got the best eyesight of any bony fish.

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So, if there are sardines around, things are gonna get pretty hectic.

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The tuna is as close to a torpedo as you'll find in the animal kingdom.

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Look at them go!

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They'll pick out the stragglers on the outside of the shoal.

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If a sardine loses his buddies for even a second, WHAM! Munched.

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Great stuff!

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I feel like I've been in a subaqua version of Top Gear!

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The tuna is kind of like the Porsche of the seas.

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They accelerate faster and can be almost as big

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and they can even cost more.

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And they're definitely going on my Deadly 60!

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The world's most hydrodynamic fish.

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A streamlined super speedster of the sea,

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the tuna is on the Deadly 60.

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