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- A group of bull sharks lived in a freshwater golf course pond for over 17 years.
- Scientists say it's the longest we've ever seen sharks live in freshwater.
- They're unsure if the original sharks are still alive, since they haven't been spotted since 2015.
For almost two decades, a golf course in Australia boasted a unique selling point — a shark-infested pond near its fourteenth hole.
Bull sharks in a pond is odd enough. Sharks in a golf course pond is odder still. But this group of bull sharks is the oddest yet.
They are somewhat of a scientific marvel because they've lived in freshwater longer than any other bull shark that scientists have observed.
Groups of bull sharks have been trapped in freshwater areas in Panama and South Africa, but those groups didn't last longer than four years, Marine Biologist Melissa Cristina Márquez, who wasn't involved in the study, reported in Forbes.
According to a recent study, these bull sharks in the golf course pond lived there for an estimated 17 years — more than half of bull sharks' projected 30-year life span.
"This new publication highlights their impressive adaptability to a wide variety of environments," Amy Smoothey, a shark scientist who wasn't involved in the study, told Slate.
How the sharks ended up on a golf course
In the mid-1990s, three severe floods pushed six juvenile bull sharks from nearby rivers into the golf course's pond. When the flood waters receded, the sharks were left stranded.
Bull sharks usually spend their early lives in the brackish waters between a river and the ocean, hiding out from larger saltwater predators. They typically head into the sea around five years of age, the study said. Or, in the event of a flood, they can end up stranded in ponds like this group.
Besides tossing the occasional scrap into the water to catch a look at the fish, the golf course left the bull sharks alone. They were never tagged.
The club did, however, make the sharks its mascot and logo.
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Where are the bull sharks now?
Since the sharks were never tagged, what scientists know about the health and current whereabouts of the first sharks comes from word of mouth.
They know that one shark was illegally hunted, and another turned up dead from natural causes, but the study said that the others could have died or escaped over the years, especially during a series of floods in 2013.
The last time any shark was spotted in the pond was in 2015, but the scientists aren't sure if that was from the original group or not.
Watch out for stagnant bodies of water
"I think a lot of people would be scared to learn there could be bull sharks in their local pond, but the fact is, it's pretty amazing that there are animals that are able to do this," Vincent Raoult, a marine ecologist at Deakin University in Australia who wasn't involved in the study, told the New York Times.
When bull sharks usually make the headlines, it's for their attacks on humans. This species comes in third place for the most attacks on humans, trailing behind great white and tiger sharks.
As extreme floods become more common and severe with climate change, it's important to be wary of bodies of water that may have recently flooded, especially in areas with bull sharks.
Even though it's unlikely that a shark will be in your favorite pond, "you should never bathe in stagnant bodies of water that once had a connection to the sea. You never know if sharks are living there," Peter Gausmann, a shark scientist, told the NYT.
from All Content from Business Insider https://www.businessinsider.com/bull-sharks-can-survive-freshwater-lived-pond-17-years-2023-9
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