Shark eaten by super predator–but not another shark

A while ago, there was an interesting story about a three-meter great white shark off the coast of Australia that got eaten by something.

Photo by Brocken Inaglory via wikimedia commons
Photo by Brocken Inaglory via wikimedia commons

It had been tagged by scientists, who later found the tag washed up on the beach. The tag recorded:

The shark was hanging out near the surface, when it suddenly dived 2000 feet.

The recorded temperature rose from 46 degrees to 78 degrees immediately, suggesting the shark was eaten very quickly, perhaps swallowed whole.

The tag rode inside the bigger animal at various depths, but mostly near the surface, until it was expelled 8 days later.

So! Apparently a documentary just aired saying that the shark was eaten by a bigger shark, possibly a megalodon. Which is pretty cool, but not entirely accurate. Max Hawthorne on Facebook wrote an excellent article dissecting the facts, and I’ve reproduced his article here, with permission.


SUPER PREDATOR – IT’S NOT WHAT THEY SAY IT IS by Max Hawthorne

I watched the documentary “Super Predator” recently. It’s the follow-up to last year’s “Hunt for the Super Predator.” I enjoyed both shows, but after having studied all the data, I find myself compelled to weigh in, because something’s not right.

Last year’s show (and I have no doubt they’ve set things up for a third episode for next year) ended with the premise that the creature that devoured a 3-meter great white shark (named “Shark Alpha” in the Bremer canyon off AU was simply a larger (i.e. 5-meter) great white. I thought this was rubbish. There was no definitive proof of the claim, and it was, IMHO, a fluff piece to quell the media storm and put people’s minds at ease.

In this year’s show, the filmmakers changed their story. Now they’ve presented the theory that a MUCH larger shark, i.e. a Carcharodon megalodon – one that inhabits the abyssal depths – was responsible for the attack on Shark Alpha. They backed this up with a photo of an 80-foot pygmy blue whale sporting a bite scar on its peduncle measuring a whopping 5 feet across. They also stated that the shark that unsuccessfully attacked the pygmy blue would have measured nearly 40 feet in length.

The facts dictate otherwise.

1- Per http://www.cwr.org.au/research/bluewhales.html, the pygmy blue measured 20-21 meters, i.e. a maximum of 69 feet.

2- Also, per the same site’s data, the bite on the whale’s tail measured a maximum of 1.2 meters across. That’s a smidgen less than 4 feet, not 5, indicating a shark around 32 feet long. A sub-adult Megalodon? Possibly. Or maybe just a really huge great white.

3- There is no indication that this pygmy blue whale was attacked in the Bremer canyon, so any insinuation that the shark that bit the whale is the same animal that devoured Shark Alpha is a stretch.

4- Per her satellite tag/tracker, Alpha’s body temperature, when attacked, was confirmed at 46 degrees Fahrenheit. Her body temperature, again per the tag, went from 46 to 78 degrees almost instantly after she was devoured.

5- White sharks have a body temperature that normally ranges from 10-14 degrees Fahrenheit above the surrounding water (the inside of the belly being the highest temp differential). Under extreme circumstances, the maximum differential has been listed at a difference of 25 degrees.

6- Based on body temperature alone, there is no way shark alpha was eaten by another great white. The temperature difference is too extreme. Moreover, if Megalodon is still alive, and has a body temperature anything like its relative, the great white, (a reasonable assumption), it would also fall within this range.

7- Megalodon was a shallow water predator. It makes no sense that it would loiter in the extreme deep where little food exists. Especially not when a banquet of whales waits at the surface.

8- The “Hunt for the Super Predator” special showed that the creature that ate Alpha remained at depths ranging from the surface to 300 feet immediately after feeding, and for the next 8 days, until the tracker/tag was excreted. This was ignored by the new show, assumedly as it would derail their “Abyssal Megalodon” theory. In fact, the “super predator’s” movements in the water column are, in actuality, similar to those of an Orca. It indicates an air breathing predator that does NOT live in the darkness of the abyss.

9- This fact is backed up by Alpha’s behavior, immediately prior to her being consumed. Once attacked, she dove to nearly 2,000 feet at high speed before she was caught and killed. This indicates an attacker that was both fast and capable of deep dives, as well as being able to accurately track fleeing prey in complete darkness (echolocation, anyone?).

10- Retreating/emergency diving to extreme depths when threatened or attacked is a documented tactic white sharks employ when one of their number has been killed by Orcas. This raises the possibility that Shark Alpha may have instinctively tried to employ this same tactic in an attempt to flee what she recognized as a large, air-breathing carnivore.

11- Per the tracker/tag, the digestive process of the “super predator” took 8 days. A great white’s digestive tract takes 24-48 hours, from what I’ve read. Something else digested Alpha – something that dissolves its meal slowly – and based on my experience keeping large crocodilians and such, that would seem to indicate a reptile.

Green sea turtle grazing sea grass, by P.Lindgren, via wikimedia commons
Green sea turtle grazing sea grass, by P.Lindgren, via wikimedia commons

12- Lastly, adult leatherback sea turtles have been known to have core body temperatures 32 degrees Fahrenheit above the surrounding sea water. If the water temperature around shark alpha was 46 degrees and you add 32 to it, you get the EXACT 78 degree body temperature of the Super Predator. Of course, leatherbacks eat jellyfish, not 3-meter white sharks. But the interesting thing about them is that they ARE marine reptiles. This implies that the creature that ate Alpha may ALSO have been a marine reptile of some kind.

(Note: Orcas, the other proposed predator here, have an internal body temperature of 97.5 –100.4 degrees F.)

SUMMARY: THE EVIDENCE SUPPORTS MY HYPOTHESIS THAT SHARK ALPHA WAS EATEN BY A LARGE, AIR BREATHING ANIMAL: ONE THAT COULD NAVIGATE IN TOTAL DARKNESS, SURVIVE THE PRESSURES OF THE ABYSS, CATCH A FLEEING GREAT WHITE SWIMMING AT 30+ MPH & SWALLOW IT WHOLE, HAD A BODY TEMPERATURE 32 DEGREES HIGHER THAN THE SURROUNDING WATER, HABITUALLY STAYED NEAR THE SURFACE FOR 8+ DAYS AFTER EATING ITS MEAL, AND TOOK 8 DAYS TO DIGEST.

CONCLUSION: SHARK ALPHA WAS CONSUMED BY A HUGE MARINE REPTILE: DISCLUDING UNKNOWN SPECIES AND FOCUSING ON THE FOSSIL RECORD, POSSIBLE CANDIDATES INCLUDE EITHER A GIANT MOSASAUR OR A PLIOSAUR. GIVEN THE DEPTHS THE PREDATOR DESCENDED TO IN PURSUIT OF THE SHARK, AND THAT MOSASAURS WERE SHALLOW DIVING, COLD-BLOODED REPTILES LIKE THEIR MODERN RELATIVES, MONITOR LIZARDS, I’M BETTING ON THE LATTER.

A Prognathodon saturator swimming in prehistoric waters.
A Prognathodon saturator swimming in prehistoric waters.

kronos_rising_hug_your_pliosaur_poster

Looks like KRONOS RISING may not be pure fiction after all.

Max Hawthorne, author
www.kronosrising.com


Very provocative article! Max has written a book that is essentially Jaws, with a mosasaur, so naturally he’s very interested in the idea of these dudes swimming around out there.

What do you think? Giant shark, or giant swimming lizard? Personally, I wouldn’t go swimming out in those Australian waters if you paid me.

EDIT: Please address all questions and arguments to Max Hawthorne’s Facebook page.

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