Greenland shark: Scientists got its vision incorrect

A shark that can live for centuries and holds unexpected tricks to keeping eyes healthy for a life time is at the centre of an uncommon conflict in Greenland. Previously this year, The Avannaata town, of which Ilulissat is the administrative seat, authorized a questionable strategy to choose 1,000 sharks, using 300 krone for each heart of a Greenland shark, according to a report in The Guardian. The strategy was ultimately dropped after Greenland’s federal government questioned whether it was legal, per The Guardian, however a future cull hasn’t been dismissed.

The proposition has actually accentuated Greenland sharks, among the least comprehended types on earth. According to the Shark Trust, it is not just the world’s slowest shark, it is the second-largest meat-eating types, after the white shark. Greenland sharks reach about 6 to 7 metres in length, they can live for more than 400 years. For a long period of time they were believed to be totally blind, although researchers have actually just recently found this might not hold true.

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According to Science Daily, scientists discovered healthy eye tissue and active proteins specifically adjusted for seeing blue light in the dim Arctic depths. DNA repair work systems might assist keep their eyes working throughout centuries. The discovery might ultimately use brand-new ideas for safeguarding human vision as we age. “You see it move its eye,” the University of California, Irvine associate teacher of physiology and biophysics, indicating the video, stated “The shark is tracking the light — it’s fascinating.”

Why researchers believed Greenland sharks were blind

The Greenland shark resides in the dim depths of the ocean and is frequently plagued with parasites that connect to its eyes. This is the primary reason that researchers thought the big, long-lived types to be functionally blind. UC Irvine scientist Dorota Skowronska-Krawczyk and coworkers have actually negated this, challenging what is understood about aging, vision, and durability.

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Their cloudy-looking eyes can appear nearly lifeless, and parasites are frequently discovered connected straight to the eyeballs. Since of those parasites and the incredibly dark, dirty environment in which the sharks live, researchers have actually long presumed that Greenland sharks might be functionally blind. A brand-new research study led by Skowronska-Krawczyk, nevertheless, recommends a really various image.

What does the research study on Greenland sharks reveal?

Released in Nature Communications, the findings recommend that a DNA repair work system might permit Greenland sharks to maintain their vision for centuries without revealing indications of retinal degeneration. Their visual systems likewise appear specifically adjusted to the incredibly low light levels of their Arctic environment.

“One of my takeaway conclusions from the Science paper was that many Greenland sharks have parasites attached to their eyes — which could impair their vision,” she states. “Evolutionarily speaking, you don’t keep the organ that you don’t need. After watching many videos, I realized this animal is moving its eyeball toward the light, said Skowronska-Krawczyk.

The Greenland sharks examined in the study were caught between 2020 and 2024 with scientific long lines near the University of Copenhagen’s Arctic Station on Disko Island, Greenland.

No signs of retinal cell death

Emily Tom, a UC Irvine Ph.D. student and physician-scientist in training in Skowronska-Krawczyk’s laboratory, recalls the moment one of those preserved eyes arrived. “I opened the plan, and there was a giant, 200-year-old eyeball resting on solidified carbon dioxide simply gazing back at me,” the 28-year-old says with a laugh. “We’re utilized to dealing with mouse eyeballs, which are the size of a papaya seed, so we needed to find out how to scale approximately a baseball-sized eyeball. Thankfully, Dorota is extremely hands-on, both in her mentoring design and in the laboratory– which you do not see a great deal of with teachers.” “The laboratory smelled like a fish market,” she says.

Tom performed histological and vision-specific analyses of the eye tissue. The researchers found no evidence of cell death in the retina. They also discovered that rhodopsin (a protein essential for vision in dim light) remained active in the shark retina. The protein was tuned to detect blue light, an adaptation that could help Greenland sharks see in the faint light available deep beneath Arctic waters.

The results suggest that the Greenland shark’s remarkable lifespan does not necessarily come with the severe retinal deterioration that might be expected in such an old animal.

What Greenland sharks tell us about aging

For Skowronska-Krawczyk, the work raises the possibility that understanding how Greenland shark eyes remain healthy for centuries could eventually point researchers toward new strategies for preventing age-related vision loss.

The findings could also help guide research into eye diseases including macular degeneration and glaucoma. At the same time, they raise broader questions about how vision evolves, how tissues remain functional over extremely long periods and whether some of those protective mechanisms could ultimately be applied to humans.

Skowronska-Krawczyk says uncertainty surrounding federal research funding has created concerns about future support for this type of work, but she remains confident that “we will dominate.”

“What I enjoy about my work is that we are the very first worldwide to see outcomes– at the leading edge, discovering brand-new systems, guidelines and discoveries,” Skowronska-Krawczyk says, looking over at the paused shark on the screen. “Being able to share this delight with trainees– that’s the finest part of it.”

Source: University of California – Irvine