The Great White Shark,one of the most feared predators in the seas.
This is one of the most dangerous sharks in the world,
considered by many to be a man-eater.
But just how aggressive are these sharks?
Join me on the expedition toinvestigate great white sharks.
大家好 我是乔纳森·伯德 欢迎来到我的世界！
Hi, I’m Jonathan Bird and welcome to my world!
Jonathan Bird’s Blue World
Great white sharks are not easy to find.
There are only a handful of places in the world
where divers can see them in the wild.
So I’ve come here, to San Diego California,
to get on a boat and make a 200 miles crossing
to an inland in Mexico called Guadalupe
where we hope to find Great White Sharks.
My home for the expedition is a converted fishing boat.
I’ll be spending the week with several other divers
and a few shark researchers.
Our journey will take us across 200 mile of open Pacific Ocean,
from San Diego,
to Guadalupe Island in Mexico, off the Baja peninsula.
We depart from the dock and start our journey with high expectations.
Our first stop, however, is at the bait shop,
where we pick up baitfish to use for catching tuna.
Then the tuna will be used as bait for the Sharks.
While I often swim with sharks in open water, unprotected by a cage,
White Sharks are a little too big for that.
The crew insists that we use cages for safety.
After 2 hours, we pass the Coronado Islandsin Mexican waters.
This is the last land I’ll see until we reach Guadalupe…
another 20 hours from now.
Along the way we stop to do some fishing.
I’m generally not much of a fisherman.
After all, I would rather swim with the fish than catch them.
but in this case we need some bait to attract the sharks,
so everyone has to do their part.
你好 哇 食物链里的另一环！
HELLO~ Aww, another one in thefood chain!
We then continue our journey to GuadalupeIsland.
We encounter some pretty rough seas,
but finally, the next morning we arrive at Guadalupe.
This desolate island is an extinct volcano that pokes out of the Pacific.
Almost nothing can survive on this rock outcropping.
Our first task upon arrival is to get the chum in the water.
The crew use fish meal and water
to create a fishy soup in a trash can.
Then, a pump squirts it overboard.
This creates a scent trail in the water
to draw the sharks to the boat.
Once the chum has been started,
we turn our attention to getting the cages in the water.
These large cages can hold up to five people each,
and they have large holes for cameras.
Hopefully, I’ll be able to get some great shots of the sharks.
Once the cages are in the water,
we tie some tuna on a rope and throw it into the water
with a float to keep it near the surface.
Members of the crew also take turns whacking the water with a pol,
which is said to attract sharks.
The water slapping and the chum soup helps get the sharks to the boat,
but only something more substantial like tuna chunks
will to convince them to stick around and approach the cages.
Now we wait.
It can take hours or even daysto get sharks.
Then without warning, a shark comes up
and checks out one of the tuna baits.
Today we’re lucky because it only took a couple of hours.
Now the fun part.
I suit up into my gear for my dive with a White Shark!
The water is about 70 degrees,
so I need a wetsuit to stay warm.
Next, I step down onto the swim platform
where the crew outfits me with a really heavy weight harness.
A normal weight belt for diving with
this much of a wetsuit is about 10 pounds,
but I am wearing a 40-pound weight harness,
so I’ll be able to stand firmly on the bottom of the cage
without floating up and hitting my head on the top of the cage!
I don’t need a bulky scuba tank,
because we are using surface-supplied air on a long hose.
Diving with Surface-Supplied Air
is a very different kind of diving than what I’m used to,
but it works well for this kind of underwater experience
as long as the shark can’t get to the hose!
They hand me my camera
and I drop below the waves to wait for a shark.
You would think it would be easy
to see the sharks once I hit the water,
but it’s more complicated than that.
The sharks like to stay down in deep water,
watching the surface from below.
White Sharks get the advantage over theirprey by surprising them.
We have to hope that the shark wants to grab this bait
and come close to the cage.
While I wait for a shark to go for the tuna bait,
I can’t do anything but wait.
Shark diving can actually be pretty boring sometimes.
Since the sharks are taking so long,
the crew has put out another kind of lure–
a 5 gallon plastic bucket filled with frozen fish.
At last I see something coming,
but it doesn’t look like a shark.
It’s a sea lion coming in to check out the tuna.
It turns out the sea lion is only mildly interested in the dead fish.
Sea lions prefer to catch livefish.
Yet this curious animal doesn’t seem too concerned
that a White Shark is lurkingsomewhere below.
Or maybe it doesn’t know.
Suddenly, the Sea lion vanishes and a sharkappears.
It seems to be aware of us,
but it’s definitely more interested in the bait.
It makes a couple of close passes to examine the bait.
Then it makes its move,going directly for the tuna.
It grabs it, bites easily through the rope,
and takes off with a tasty mouthful.
After that, the shark heads back down below us, out of sight.
What’s going on?
Why is the shark not attacking the cage and trying to eat us?
As I watch the White Shark behavior over a couple of days,
I can see a pattern.
It likes nice chunks of bait to eat,
and it has no interest in the cages or the people in them.
Wow! What an incredible animal!
Well, it just goes to show you the sharks are really interested in the bait.
They really haven’t got a lotof interest in me.
They know exactly what they want and they go straight for it.
And the cage just really makes me feel better.
Occasionally the shark comes up and bites the bucket full of frozen chump,
just to see if there is anything tasty in there.
When it figures out that the chump is chopped up too finely to eat,
it goes back to the bottom.
The White Sharks only come up for food.
They can tell the difference between nice juicy piece of fish, and a bucket.
They show no interest in chasing the sea lions around the boat, either.
These sharks are obviously a lot smarter than they appear.
Some of the shark research being done around Guadalupe Island
includes identifying individuals to see if they return year after year.
Several have been named including Scarboard,
a large female who has a scar on her right,
which is her starboard side.
Other identifying features researchers look for
include the coloration in the area around the gills,
and also the color pattern by thetail.
No two sharks are exactly alike.
Any distinguishing markslike this white streak on the nose
helps researchers identify individual sharks.
Time flies when you’re having fun.
All too soon, our time with the sharks comes to an end
and we have to turn for home.
I look forward to returning to the island of Guadalupe
and visiting the sharks again soon.
It may be rather desolate above the water,
but it’s rich with incredible animals
living within its blue underwater world!