Modern Shark Myths

When taking people into sharks’ natural habitat, many of whom for the first time, the One Ocean Diving crew tends to hear misconceptions about these animals daily.

“I think the most common misconception is that ‘If I’m out surfing a shark is going to eat me,’” said Mariah Meyer, a shark safety diver, “which is not not true, but the likelihood of that happening is so slim.”

At the One Ocean office, most of the initial customer questions fall into this category. What is the safety record? How often do people get bit?

The answer is simple. 100%--no one has ever gotten bit. A lot of that has to do with the extensive training the divers go through. But also, no shark is the mindless killer many seem to think they are.

In fact, sharks are aware predators that are constantly searching for other aware predators in the water. It’s hard to ambush something that is focused and combative. Sharks are seeking to maintain their social hierarchy and have learned how to spot potential threats to it. Sharks can hear a bird splash on the surface a mile away and can see about as far as humans. So, posture, focus, and behavior in the water will alter how sharks behave around you.

Shark culling efforts globally—wiping whole populations of sharks so more people are comfortable in certain areas—implies that some people think they would be safer if sharks didn’t exist.

This is simply not true. Sharks maintain healthy fish populations by eliminating the slow, weak, and sick of the school. Since 70% of the earth’s oxygen comes from the sea, sharks are vital in keeping ecosystems across the globe healthy which in turn benefits humans’ overall well-being.

While shark attack statistics are a constant regurgitant, it seems news stories sensationalizing attacks gain much more retention. People are less likely to die from a shark than by not only a dolphin, but also their pet dog, significant other, the car ride to their shark dive, the boat ride out of the harbor, or two lightning strikes.

“You’re more likely to die from a coconut hitting you on the head then to get bit by a shark,” Mariah said, “which is crazy.”

While less than ten people are killed by sharks annually, the recorded number for shark deaths by humans is 100,000,000. Assuming most shark deaths occur off any census, this could put the actual number well over 200,000,000.

The main reason for this is shark fin soup, but bycatch and culling, as well as other shark products, play a major part as well. Shark meat can be found in many brands of pet food. Squalene, shark liver oil, lives in many cosmetic products.

Sharks are much more often killed than discovered dead. So, that shark-tooth necklace you found in the gift shop? If it’s white, the shark was likely killed for its teeth. If it’s brown, or fossilized, it was likely found.

Another often-heard misnomer is that human blood gives sharks cravings, and they can smell a drop from miles away. In truth, they can smell it in about an Olympic-sized pool, still pretty impressive, and it does not make them want to eat people.

A common analogy One Ocean divers use is to imagine walking down the street and catching the scent of a food vendor. It will likely make you hungry. But if you enter a Bath & Body Works, you will smell perfume or scented lotion, maybe even find it pleasant, but you won’t crave drinking it.

Finally, there must be plenty of sharks, right? Well, if the shark-death statistics didn’t already spoil this one, no.

The Marine Mammal Protection Act was established in 1972 to prevent marine mammal species from declining beyond the point where they ceased to be a significant functioning element of the ecosystems they take part in. Since it was enacted, no marine mammal species has gone extinct in U.S. waters. The act has also stopped the decline of many marine mammal populations and have led to the recovery of several, such as humpback whales, gray whales, gray seals, and California sea lions.

Unfortunately, there is no such widespread protection for sharks. Since 1972, the general population of sharks globally has dropped by up to 90%, putting many individual species on endangered lists.

Being aware (as if you are in the water with sharks) of what you are purchasing can make all the difference. Buying fish from a local market as opposed to commercial fisheries, avoiding shark products in general, and also—swimming with sharks! Supporting a shark tourist industry proves even greater value to their presence in some areas.

Take it from someone who swims with sharks every day:

“People tell me that I’m going to get bit by a shark and die, which, first of all, is terrible thing to say to someone, so please don’t say that to people,” Mariah said. “Second of all, if the shark wanted to kill me, it would. If it wanted to bite me, it would. But they don’t. I am continuously in the water with these animals day after day, and have been 100% safe.”

Declining Shark Populations

Sharks have been swimming in the oceans for more than 400 million years, but in recent decades their populations have declined dramatically. Since the 1970s, some populations by more than 90%.

There are a number of factors that have contributed to this, including overfishing, habitat loss, climate change, and bycatch.

Overfishing is one of the biggest threats facing shark populations. Sharks are highly valued for their meat, fins, and other products, and are targeted by commercial fishing operations around the world. The practice of shark finning, which involves removing the fins and discarding the rest of the shark, has had a particularly devastating impact on shark populations.

Habitat loss is also a significant factor. Many shark species rely on specific habitats, such as coral reefs, seagrass beds, and estuaries for feeding, breeding, and resting. These habitats have been degraded and destroyed by human activities such as coastal development, pollution, and climate change.

Climate change is another major threat. Rising sea temperatures and ocean acidification can have a range of negative impacts on marine ecosystems, including changes in the distribution and abundance of key prey species. This can lead to reduced food availability for sharks and other predators, which can ultimately impact their survival and reproductive success.

Bycatch, the accidental capture of non-target species in fishing gear, is also a major issue. Sharks are often caught as bycatch in a variety of fishing operations, including longlining and gillnetting. This can have a significant impact on shark populations, particularly for species that are already vulnerable due to other threats.

Despite the many challenges, there is still hope for conservation. Efforts to reduce overfishing and regulate the shark fin trade have gained momentum in recent years, and a number of countries have implemented measures to protect shark populations. Additionally, habitat restoration and conservation initiatives can help to create more suitable habitats for sharks and other marine organisms.

By raising awareness of the threats facing sharks and taking action to protect their habitats and reduce overfishing and bycatch, we can work toward securing a brighter future for these iconic and important species.

References:

Dulvy, N. K., et al. "Extinction risk and conservation of the world's sharks and rays." Elife 3 (2014): e00590.

Baum, J. K., et al. "Collapse and conservation of shark populations in the Northwest Atlantic." Science 299.5605 (2003): 389-392.

Worm, B., et al. "Global catches, exploitation rates, and rebuilding options for sharks." Marine Policy 40 (2013): 194-204.

On Locking Eyes with a Shark

Off the Mornington Peninsula in Victoria, Australia, 43-year-old diver Marshall Yu was approached by a 13-foot great white. He recalls being frozen in place as the behemoth shark, curious, came right for him. 

Through the brief news circulation following the event, much adding expected sensationalism, Yu’s quote stands out. “I didn’t see any aggression,” he said. “I made eye contact with it. (The shark) was pretty cute.” 

It may seem unbelievable that, during an unexpected encounter with such a large predator, one would even recognize the eyes, let alone comment on their beauty. But Yu is not alone in this thought. 

Charles Darwin kept a journal from 1831-1836 chronicling his voyage along the southern hemisphere. In an August 28 entry he speaks on a shark’s eye with undeniable revery:  “Caught by a hook a specimen of genus Squalus: Body “blueish grey”; above, with rather blacker tinge; beneath much white:--Its eye was the most beautiful thing I ever saw.—pupil pale “Verdegris green,” but with a lustre of a jewel, appearing like a Sapphire or Beryl.—Iris pearly edge dark.—Scelerotica pearly.” 

Not every shark species has a pale green pupil around a Sapphire jewel with a pearly sclera. All are different, and in What You Should Know About Sharks, Ocean Ramsey argues this visual difference may affect their overall vision and, by extension, behavior. 

“They all have unique eyes, beautiful and complex, and highly adapted to their specific ecological niche,” Ramsey writes. “Take tiger sharks, for example. Tiger sharks have an amber-yellow eye, like the color you see in the water in low morning and evening light. I can’t prove it exactly, but I think this coloring may provide an advantage. I have observed that tiger sharks like to approach with the sunlight perhaps because most animals avoid looking into the bright sunlight. It’s possible the color of their eyes helps with this approach in this type of low light. However, I’ve also observed that tiger sharks do not have the best eyesight. They don’t seem to notice small objects like many other species do, which might explain why, in addition to their foraging behavior and size, they are one of the species more suspect in adverse interactions in tropical waters.”

So, a shark’s eyes can stand out to a human. But can a human’s eyes stand out to a shark? Is Yu correct in saying he made mutual eye contact with the great white? According to shark experts, also yes. 

While sharks lack the cells to process color vision, they do not lack visual acuity. Human eyes use muscles which control the lens shape and can focus light signals. Though shark lenses do not change shape, they can move forward and backward to focus light. In this sense, many sharks have been documented with a near-equal quality of vision as humans and rely on this strong sense for much of their activities and behavior. 

A 2021 study published by the Journal of Ecotourism considered eye contact between humans and approaching Caribbean reef sharks, examining specifically whether an interruption, such as glancing at a camera or regarding where to retreat, would affect a shark’s behavior. In the field, divers maintained or interrupted eye contact with them, finding that the sharks came significantly closer to the divers when eye contact was interrupted and also reduced their speed. 

“I don’t usually wear a mirrored scuba mask because I get a better response when the sharks can see my eyes,” Ramsey writes. “I also no longer wear mirrored lenses because they reflect light at random which can be eye catching in a bad way depending on my position. I’ve had a shark in the Bahamas rush at the reflection from my mask which I was able to block off at the last moment.”

Many types of sharks ambush their prey, and they can’t sneak-attack something that is aware of them. Thus, they have become evolutionarily wired to make and sense eye contact. 

“The majority of the time, sharks rely on eyesight when hunting and are very sensitive to the eye line of prey and other predators,” Ramsey writes. “It’s for their own safety and success to be able to identify if a potential prey item is aware of their presence, and to identify where the front or eyes of a prey item or another predator are located and looking.” 

Looking a shark in the eye is one of Ramsey’s favorite things to do. Much can be gained by studying how a shark scans its domain and what catches its attention. It allows divers to realize how much detail each species can and cannot see. It helps them understand what can attract unnecessary attention or cause confusion—a safety protocol when interacting with sharks. 

Sharks, in identifying prey, in establishing dominance, are constantly surveilling the blue surroundings for an eyeline. But is this all it is, a simple prey-or-not binary, a checkbox of dominant or submissive? According to the people who are in the water with them every day, there might be something more going on here. 

“Any time I have the experience where I get to lock eyes with a shark it’s almost as if time stops,” says Marina Praet, a safety diver at One Ocean Diving. “It’s as if you are able to communicate without words and peacefully coexist in their home. It truly shifts your perspective on sharks as a whole because you get to see them as more than an animal. You get a glimpse into their personality and have a chance to understand them on a deeper level.”