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Hungry Great White Shark Opts for Pregnant Shark for Dinner

Image by One that didn't get away - a Porbeagle shark by Des Colhoun, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

Shockingly, a pregnant porbeagle shark was believed to have been eaten by a much larger great white shark off the coast of Bermuda. In this case, the hunter became the hunted in an unusual turn of events…

A First in Marine Science

Tagged great white shark
Tagged shark, image by Phillip Colla, CC0, via Wikimedia Commons

The event took place in Bermuda’s waters, a region known for its rich marine biodiversity and deep ocean habitats. Researchers were tracking a tagged pregnant porbeagle shark, when the data suddenly revealed something unusual. The shark’s tracker indicated a rapid dive into deep waters. Subsequently, there was a rise in the temperature of the porbeagle’s satellite tag, which was strange given the cooler temperatures of deeper waters. The signs were there; this shark had met an untimely demise. And was now in the warm belly of a much larger shark that roamed the deep.

The Porbeagle Shark: A Resilient Predator

Squid
Squid, image by Rhododendrites, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Porbeagle sharks are known for their endurance and hunting capabilities, often preying on fish, squid, and even smaller sharks. Measuring up to 8-10 feet in length, these sharks are fast swimmers and can inhabit both coastal and deep waters. Often mistaken for great whites due to their similar body shape and dorsal fin, they are not to be messed with. However, they are typically smaller than a great white – up to half its size. This put the porbeagle at much of a disadvantage. Her pregnancy most likely also added to her vulnerability as a result of a large and enticing protruding belly.

The Great White Shark Who Shows No Mercy

Great white shark skeleton
Great white shark skeleton, image by Cette photo a été prise par André ALLIOT., CC0, via Wikimedia Commons

The great white shark is one of the most feared and respected predators in the ocean, known for its immense size, powerful jaws, and ability to take down large prey. Great whites can grow up to 20 feet long and weigh over 4,000 pounds, making them some of the largest and most dominant predators in the ocean. In this case, the great white shark was clearly larger and more dominant than the porbeagle who seemed to be easy prey.

Shark-on-Shark Feeding 

Overfishing
Overfishing, image by John Wallace, NOAA/NMFS/NWFSC/FRAMD, Public domain, via Wikimedia Commons

Shark-on-shark predation is rare but not unheard of; great whites have been known to attack smaller sharks, especially in competitive hunting scenarios or territorial disputes. However, what is concerning about this attack is that the porbeagle is slowly but surely becoming outnumbered in part due to overfishing. It now becomes a question of how to sustain this vulnerable species who’ve made it onto the IUCN (i.e. the International Union for Conservation of Nature) list without interfering with the apparent evolution of the food chain as we know it.

Why Bermuda? The Island’s Unique Marine Environment

Bermuda ocean
Bermuda, image by Tomwsulcer, CC0, via Wikimedia Commons

Bermuda’s waters offer a unique environment for marine life due to the island’s location in the North Atlantic and its deep-sea habitats. The surrounding waters, particularly the nearby Sargasso Sea, are teeming with life and are known to host various species of large sharks. The island’s steep underwater drop-offs make it an ideal hunting ground for apex predators like great whites. Bermuda’s deep waters also generally provide a relatively safe space for pregnant sharks seeking refuge during their vulnerable months. Ironically, this wasn’t the case for this porbeagle as deeper safer waters could not protect her and her young from the danger that awaited them.

Implications for Marine Food Chains

The food chain
The food chain, image by Zingone A, D’Alelio D, Mazzocchi MG, Montresor M, Sarno D, LTER-MC team (2019), CC BY 4.0 https://creativecommons.org/licenses/by/4.0, via Wikimedia Commons

This event challenges long-standing assumptions about the marine food chain, particularly in Bermuda’s waters. Great white sharks are known to be at the top of the food chain. However, this incident suggests that the dynamics between apex predators are more complex than previously thought. The fact that a great white shark could prey on a pregnant porbeagle highlights the harsh realities of survival of the fittest in the ocean.

Possible Theories

Great white shark
Great white shark, image by Terry Goss, CC BY-SA 3.0 http://creativecommons.org/licenses/by-sa/3.0/, via Wikimedia Commons

There are several theories why the great white shark attacked the pregnant porbeagle. One possibility is territorial behavior. Great whites are known to be highly territorial, especially in waters where food sources are abundant. The porbeagle may have entered the great white’s territory, leading to a predatory response. Another theory is simple predation. The porbeagle, slowed down by her pregnancy, may have been seen as an easy target by the great white.

Apex Predator Behavior in Bermuda’s Waters

Marine conservation
Marine Conservation, image by Lamlash Bay Community Marine Conservation Area by M J Richardson, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

The incident has sparked renewed interest in the behavior of apex predators in Bermuda’s waters. The fact that a great white could target a pregnant porbeagle suggests that shark-on-shark interactions in this region may be more frequent than previously thought. Understanding these behaviors is crucial for marine conservation efforts. Apex predators like great whites and porbeagles play an essential role in maintaining the balance of marine ecosystems. By studying their interactions, researchers hope to gain insight into the complex dynamics of predator-prey relationships in Bermuda’s marine environment.

The Future of Shark Research in Bermuda

Shark study
Shark study, image by NOAA Photo Library, Public domain, via Wikimedia Commons

The incident has sparked new interest in shark research and conservation efforts in Bermuda. Marine biologists are keen to learn more about the interactions between different shark species in the region, particularly in deep-sea habitats where much remains unknown. This recent turn of events could call for more advanced tracking systems that can reveal the real goings on underwater with much more clarity.

Public Fascination with Great Whites and Porbeagles

Shark interaction
Shark interaction, image by National Marine Sanctuaries, Public domain, via Wikimedia Commons

The event has captured the public’s imagination, especially due to the involvement of two highly iconic shark species. Great white sharks have long been a subject of fascination and fear because of their skillful and frighteningly scary predatory behavior. Porbeagle sharks, while less known, have become a subject of interest due to their unique biology and the rare documentation of this event. The idea that these two shark species could interact in such a dramatic way adds a new layer of intrigue to their relationship.

A Groundbreaking Discovery

Hungry leopard seal
Hungry Leopard seal, image by Murray Foubister, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

The discovery of a pregnant porbeagle shark being eaten by a great white is the first of its kind. It challenges our understanding of apex predator behavior regarding peacefully co-existing together. Or, seeing each other as an additional food source. As researchers continue to study this event and the deep waters of Bermuda, more discoveries may come to light. What is being found are valuable insights into the fascinating and often brutal world of survival in an underwater jungle.

Conclusion

The ocean
The ocean, image by apasciuto, CC BY 2.0 https://creativecommons.org/licenses/by/2.0, via Wikimedia Commons

This event reminds us that the ocean, despite our technological advancements, still holds untold secrets and mysteries. With each new discovery we are able to better comprehend the relationships between species. And what this means for a food chain that is seemingly evolving as we speak.