Yellow-Fin Tuna Deadly 60 Bites
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Transcript
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On Deadly 60 I've had loads of incredible animal encounters. | 0:00:04 | 0:00:08 | |
Here's just one of my many favourites. | 0:00:08 | 0:00:11 | |
We're skimming over chilly South Australian seas. | 0:00:17 | 0:00:21 | |
Around about here. | 0:00:21 | 0:00:24 | |
Although my crew's about to take off at the moment! | 0:00:24 | 0:00:27 | |
Stick with it, guys. | 0:00:27 | 0:00:29 | |
Today's animal is deadly because it's quick. | 0:00:29 | 0:00:33 | |
You're looking at the fastest fish in the seas. | 0:00:33 | 0:00:36 | |
They're all submarine speedsters, | 0:00:36 | 0:00:39 | |
but the fish I'm after is turbo-charged, | 0:00:39 | 0:00:42 | |
clocking up speeds of over 70km an hour. | 0:00:42 | 0:00:44 | |
Ladies and gentlemen, I give you... | 0:00:44 | 0:00:48 | |
the tuna! | 0:00:48 | 0:00:49 | |
But first, a bit of Deadly 60 science. | 0:00:49 | 0:00:53 | |
The big enemy of anything trying to travel fast in water is drag. | 0:00:53 | 0:00:57 | |
That is the force of the water holding you back | 0:00:57 | 0:01:00 | |
as you try and move forwards. | 0:01:00 | 0:01:02 | |
To get around that you have to be streamlined. | 0:01:02 | 0:01:05 | |
In the air that's aerodynamic, in the water hydrodynamic. | 0:01:05 | 0:01:09 | |
The tuna is just about the most perfect example | 0:01:09 | 0:01:12 | |
of a hydrodynamic fish. | 0:01:12 | 0:01:14 | |
I, on the other hand, am not that streamlined. | 0:01:14 | 0:01:17 | |
So, theoretically, if I was to get in there and try and travel fast, | 0:01:17 | 0:01:21 | |
I should be hammered by drag. | 0:01:21 | 0:01:23 | |
So, we already know that tuna can travel up to around 70km an hour, | 0:01:24 | 0:01:30 | |
which equates to about 38 knots. | 0:01:30 | 0:01:33 | |
OK, Captain, hit it! | 0:01:34 | 0:01:36 | |
You can see as we start to build up speed, | 0:01:41 | 0:01:44 | |
automatically the water's pushing back against me | 0:01:44 | 0:01:48 | |
and I'm really struggling to hold on. | 0:01:48 | 0:01:51 | |
I'm actually already losing my trunks! | 0:01:53 | 0:01:56 | |
What speed are we at, boys? | 0:01:56 | 0:01:59 | |
That's 4.7 knots, Steve. | 0:01:59 | 0:02:02 | |
Well, I've still got hold of the rope but I've only just got... | 0:02:02 | 0:02:07 | |
How fast now? | 0:02:07 | 0:02:09 | |
What's that? | 0:02:09 | 0:02:10 | |
6.8. | 0:02:10 | 0:02:11 | |
Aaah! | 0:02:11 | 0:02:12 | |
-I've lost my trunks! -Lost his trunks! | 0:02:14 | 0:02:17 | |
This is not good. I hope you can't see my bottom! | 0:02:18 | 0:02:23 | |
OK, so we're now going about a tenth of the speed | 0:02:24 | 0:02:28 | |
that a tuna can go full whack. | 0:02:28 | 0:02:31 | |
It's almost pulling my arms out my sockets! | 0:02:31 | 0:02:34 | |
And I'm absolutely naked! | 0:02:34 | 0:02:37 | |
Ha-ha! | 0:02:37 | 0:02:38 | |
How fast's that, Mark? | 0:02:38 | 0:02:40 | |
-Seven knots. -Seven. | 0:02:40 | 0:02:42 | |
No! That's rubbish! | 0:02:42 | 0:02:45 | |
-Switch faster. -Aah! | 0:02:45 | 0:02:48 | |
He's gone. | 0:02:48 | 0:02:49 | |
He's gone, Mark, he's gone. | 0:02:49 | 0:02:51 | |
What's that? | 0:02:51 | 0:02:52 | |
See you, Steve! | 0:02:53 | 0:02:54 | |
Bye, Steve! | 0:02:54 | 0:02:56 | |
-Bye! -Bye! | 0:02:56 | 0:02:57 | |
He's got a nice bum though, hasn't he?! | 0:02:57 | 0:03:00 | |
Yeah, I noticed. He must work out. | 0:03:00 | 0:03:02 | |
What was our final speed when he let go, Mark? | 0:03:03 | 0:03:07 | |
8.5. | 0:03:07 | 0:03:08 | |
8.5, oh, he did quite well. | 0:03:08 | 0:03:11 | |
Not bad for a beginner. | 0:03:11 | 0:03:13 | |
I think that pretty much proves that unless you're streamlined | 0:03:13 | 0:03:17 | |
you ain't going nowhere in the water. | 0:03:17 | 0:03:20 | |
And it also proves why fish don't wear swimming costumes! | 0:03:20 | 0:03:24 | |
You better not film this when I try and get out the water. | 0:03:24 | 0:03:27 | |
So, so far we've proved that I can't swim. | 0:03:30 | 0:03:34 | |
As well as a tuna! | 0:03:34 | 0:03:36 | |
But I can't dry off yet | 0:03:37 | 0:03:39 | |
cos I still wanna get in the water with these amazing creatures. | 0:03:39 | 0:03:43 | |
Growing up it never really occurred to me that the fish in these tins | 0:03:46 | 0:03:51 | |
are some of the most special and some of the fastest in the seas. | 0:03:51 | 0:03:55 | |
Unfortunately they're prized as food which means they're becoming rare. | 0:03:55 | 0:04:00 | |
Fishermen, attempting to make sure they don't become extinct, | 0:04:00 | 0:04:04 | |
have started keeping tuna in these big nets, | 0:04:04 | 0:04:07 | |
giving me a unique opportunity to get close to them. | 0:04:07 | 0:04:10 | |
There are lots of different types of tuna. | 0:04:20 | 0:04:24 | |
The ones swimming round in here are about as big as me, | 0:04:24 | 0:04:28 | |
but the biggest ever was heavier than a horse! | 0:04:28 | 0:04:31 | |
This is extraordinary! There's hundreds of them. | 0:04:31 | 0:04:35 | |
Each one of these tuna weighs almost as much as me | 0:04:38 | 0:04:42 | |
but they swim effortlessly. | 0:04:42 | 0:04:45 | |
Just gliding past me. | 0:04:45 | 0:04:46 | |
They're barely swimming, look! | 0:04:46 | 0:04:49 | |
I feel like fish food! | 0:04:50 | 0:04:52 | |
Look at that! | 0:04:52 | 0:04:53 | |
Being up close to them under water | 0:04:59 | 0:05:02 | |
makes it easy to see why they're deadly predators. | 0:05:02 | 0:05:05 | |
They are the perfect shape, nothing sticks up off it to slow them down. | 0:05:05 | 0:05:11 | |
So they move with just a flick of their tail. | 0:05:11 | 0:05:14 | |
Awesome! Ha-ha! | 0:05:14 | 0:05:16 | |
Luckily, tuna fish eat small fish like sardines. | 0:05:17 | 0:05:22 | |
If I was a sardine now, I'd last about a second. | 0:05:22 | 0:05:26 | |
Tuna accelerate faster than a sports car. | 0:05:27 | 0:05:31 | |
And they've got the best eyesight of any bony fish. | 0:05:31 | 0:05:35 | |
So, if there are sardines around, things are gonna get pretty hectic. | 0:05:35 | 0:05:39 | |
The tuna is as close to a torpedo as you'll find in the animal kingdom. | 0:05:46 | 0:05:51 | |
Look at them go! | 0:05:51 | 0:05:52 | |
They'll pick out the stragglers on the outside of the shoal. | 0:05:54 | 0:05:58 | |
If a sardine loses his buddies for even a second, WHAM! Munched. | 0:05:58 | 0:06:03 | |
Great stuff! | 0:06:15 | 0:06:16 | |
I feel like I've been in a subaqua version of Top Gear! | 0:06:16 | 0:06:20 | |
The tuna is kind of like the Porsche of the seas. | 0:06:20 | 0:06:23 | |
They accelerate faster and can be almost as big | 0:06:23 | 0:06:27 | |
and they can even cost more. | 0:06:27 | 0:06:29 | |
And they're definitely going on my Deadly 60! | 0:06:29 | 0:06:32 | |
The world's most hydrodynamic fish. | 0:06:36 | 0:06:40 | |
A streamlined super speedster of the sea, | 0:06:40 | 0:06:43 | |
the tuna is on the Deadly 60. | 0:06:43 | 0:06:46 |