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A mature male silk shark is seen with most of its fins missing. A year later, the fin is almost fully regrown.
The shark was found off the coast of Jupiter, Florida. Chelsea, a marine conservation scientist from the University of Miami, began recording the migration route of the silky shark, named after its smooth skin, and she documented the rare phenomenon of sharks regenerating their dorsal fins.
Scientists Track the Mystery of Shark Silk Traces.
Sharks of the silk (carcharhinus falciformisumumnya) are found in open seas and can grow up to 10 feet long. Scientists know that these sharks gather in South Florida every summer, but where they go throughout the year remains a mystery. Local boat captain John Moore took us to the location where the sharks gather. Chelsea and her team carefully captured and attached a GPS tracker to the dorsal fin, or upper fin.
The following text is already in English and does not need to be translated.
Chelsea placed a GPS tag and placed a second tag under the dorsal fin of each shark, displaying a unique ID number, so that I can ensure that the shark is injured.
"Mystery of the Silk Shark Fin."
Move to one year later, summer of 2023. Chelsea received several photos of silk sharks from John Moore, the captain of the ship. In many of the photos he sent, she saw a smooth shark with a strangely shaped dorsal fin. A few days later, John got close enough to take a picture of its identification mark, and John also saw and photographed the shark whose dorsal fin was known to have healed with a newly injured dorsal fin.
His wound not only healed completely, but the size of his dorsal fin in 2023 is also 10.7% larger compared to after the injury in 2022. A new fin tissue has regenerated.
Source: Live Science
The analysis shows that within 332 days, the shark successfully regenerated enough tissue so that its dorsal fin has almost returned to 90% of its original size, regrowing more than half of what was cut in 2022.
"Back fins, steering, and hydrodynamics that are crucial for sharks to hunt and survive are known to have no infections or signs of malnutrition."
Scientists know that sharks have incredible healing abilities, although the mechanism behind this phenomenon is still a mystery. Although the regeneration of body parts has been observed in other marine animals such as starfish and crabs, there is only one other recorded incident of a shark being able to regenerate its dorsal fin.
Source: Live Science
The case involves a whale shark in the Indian Ocean, which managed to regrow its dorsal fin after a ship accident in 2006.
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