Are bigfin squids rare? – The Spiderman of The Sea

Bigfin squids, a subject of great fascination among marine biologists, have long captured the attention of both scientists and curious minds alike. This particular cephalopod’s unusual physical characteristics and elusive nature have led to the question: are bigfin squids rare? In this article, we will explore the various dimensions of bigfin squids, their habitat, behavior, and what makes them so rare.

Bigfin squids, belonging to the genus Magnapinna, are known for their unique appearance characterized by large fins and extremely long, slender arms and tentacles. Their mysterious nature is compounded by their deep-sea habitat, making them difficult to study. So, let’s go into the details and examine the different aspects that contribute to their rarity.

Physical Characteristics

  • Appearance

The bigfin squids have a distinctive look that sets them apart from other cephalopods. Their most notable feature is their large fins, which can be up to 90% of the mantle length. The fins, in combination with their incredibly long arms and tentacles, give them an eerie, alien-like appearance.

  • Size

Typically, bigfin squids measure between 5 to 8 meters in length, with their arms and tentacles accounting for a significant portion of this measurement. However, the true size of these creatures remains an area of ongoing research.

Habitat and Distribution

Bigfin squids reside in the deep-sea environment, specifically in the mesopelagic and bathypelagic zones. Here’s a closer look:

  • Geographic Spread

Bigfin squids are widespread and have been spotted in various oceans around the world. Sightings have been reported in the Atlantic, Indian, and Pacific Oceans, at depths ranging from 1000 to 4800 meters.

  • Environmental Conditions

Their habitat is characterized by low temperatures, high pressure, and complete darkness, which adds to the challenge of studying these creatures.

Behavior and Lifestyle

  • Feeding Habits

Bigfin squids are believed to be carnivorous, preying on small fish and other invertebrates. The long, filament-like tentacles are thought to play a role in trapping prey, although this remains speculative due to limited observations.

  • Reproduction

Little is known about the reproduction process of bigfin squids. Their elusive nature has left many questions unanswered, including their mating rituals, egg-laying practices, and developmental stages.

Rarity and Challenges in Study

  • Limited Observations

Despite their global distribution, bigfin squids are seldom seen. Only a handful of observations, primarily through remotely operated vehicles (ROVs), have been documented. This scarcity of sightings contributes to their perception as rare creatures.

  • Challenges in Research

Studying bigfin squids poses numerous challenges, including:

  • Depth: Their deep-sea habitat requires specialized equipment and technology.
  • Visibility: The lack of natural light makes observation and capturing images difficult.
  • Knowledge Gap: The absence of physical specimens has limited the ability to conduct in-depth research.

Conservation Status

Due to the lack of data, the conservation status of bigfin squids remains undefined. The deep-sea environment shields them from common human threats, but potential concerns like deep-sea mining and climate change could have unforeseen impacts.

10 Fun Facts:

Delving into the world of bigfin squids, one can’t help but encounter a treasure trove of fun and fascinating facts. Their alien-like appearance and elusive nature make them one of the ocean’s most captivating creatures. Here’s a collection of intriguing tidbits that offer a glimpse into their mysterious existence:

  1. Elongated Arms and Tentacles: The bigfin squid’s arms and tentacles can be 13 to 20 times the length of its body, giving it an ethereal appearance. The exact purpose of these elongated appendages is still a subject of research and speculation.
  2. Named After Their Fins: As the name suggests, bigfin squids are known for their unusually large fins, which can make up nearly 90% of the mantle’s length. These fins are believed to help with stability as they drift through the dark depths of the ocean.
  3. Global Travellers: Despite their rarity, bigfin squids have been spotted across various oceans, from the Gulf of Mexico to the coast of Brazil, and even near Australia. Their widespread distribution is a testament to their adaptability.
  4. Almost Alien: The bigfin squid’s appearance is so unusual that it has often been compared to extraterrestrial beings. Some observers have even likened them to floating ghosts or underwater phantoms.
  5. Depth Dwellers: Bigfin squids are found at incredible depths, sometimes as deep as 4800 meters (15,748 feet). That’s taller than many of the world’s highest mountains!
  6. Rare Footage: The first video footage of a bigfin squid was captured in 1988, but it wasn’t until 2001 that clearer images were obtained. Since then, there have been only a handful of video sightings, each one adding valuable insights into their behavior and biology.
  7. Mystery Diet: What do bigfin squids eat? The answer remains mostly a mystery. Scientists believe they consume small fish and crustaceans, but actual evidence of their feeding habits is rare.
  8. No Captive Specimens: As of now, there are no known captive specimens of bigfin squids. Their deep-sea habitat and delicate nature make them incredibly challenging to collect and study.
  9. Potential Bioluminescence: Some researchers hypothesize that bigfin squids may possess bioluminescent capabilities, allowing them to glow in the dark depths of the ocean. This, however, remains an unconfirmed theory.
  10. A Genus Full of Mystery: The genus Magnapinna consists of several species, but distinguishing between them is challenging due to the limited data available. This adds another layer of complexity to their study.


How do bigfin squids move in the water given their long arms and tentacles?

Bigfin squids are believed to use a combination of jet propulsion and fin movement to navigate the deep-sea environment. The jet propulsion is driven by expelling water through a funnel-like structure, while their large fins provide stability and direction. The interaction of these movements with their elongated arms and tentacles is still not fully understood, and their precise locomotion mechanisms remain a subject of study.

What technologies are primarily used to study bigfin squids?

To study bigfin squids, scientists often rely on deep-sea exploration technologies such as Remotely Operated Vehicles (ROVs) and Autonomous Underwater Vehicles (AUVs). These technologies are equipped with cameras and sensors to capture images and gather data in the extreme depths where bigfin squids reside. Submersibles, manned by researchers, are also sometimes used for direct observation.

Are there any known predators of the bigfin squid?

Due to the extreme depths at which bigfin squids reside and the limited data available, their natural predators are not well-known. Potential predators might include large deep-sea fish and other cephalopods, but definitive information on what preys on bigfin squids is lacking.

How do researchers differentiate between different species of bigfin squids?

Differentiating between species within the Magnapinna genus is a complex task due to the scarcity of physical specimens. Researchers might rely on subtle differences in appearance, such as fin size and arm length, or on genetic analysis when possible. However, the identification and classification of different species remain challenging.

Is there any folklore or cultural significance related to bigfin squids?

While bigfin squids may not have the same level of cultural prominence as some other sea creatures, their mysterious and otherworldly appearance has inspired comparisons to aliens and ghosts. This has led to a certain mystique surrounding them in popular culture, particularly within the realms of science fiction and ocean exploration.

Could bigfin squids survive if brought to the surface for study?

Bringing bigfin squids to the surface is an incredibly challenging task due to their delicate nature and the extreme pressure changes they would experience. Such a dramatic shift in environment would likely be fatal to the creature. Hence, most studies are conducted through remote observation in their natural habitat to avoid harming these elusive beings.


The bigfin squids remain an emblem of the ocean’s mystery and unexplored wonder. These fun facts only scratch the surface of what there is to know about these captivating creatures. The more we learn about them, the more they ignite our curiosity and deepen our appreciation for the vast and complex world beneath the waves.

Are bigfin squids rare? The answer to this intriguing question is complex. While their widespread geographic distribution suggests that they may not be inherently rare, the limited observations and difficulty in studying these creatures contribute to their mystique and perception of rarity.

In the quest to unravel the mysteries of the bigfin squid, continued research, exploration, and technological advancement are vital. They stand as an enduring symbol of the ocean’s enigmatic depths and a reminder of how much remains to be discovered in our planet’s vast, unexplored frontiers.