Yes, sharks have surprisingly good memories, capable of long-term recall for specific tasks, locations, and even individuals, with studies showing they can remember learned information for months to over a year, challenging the myth that fish have poor memories. Their brains have specialized regions for memory, spatial learning, and processing, allowing them to learn complex behaviors like identifying shapes, associating lights with food, and recognizing people, which is crucial for survival and navigation.
At the end of these intelligence experiments, some 50 months after the start of the study, the researcher tested the grey bamboo sharks to see if they still remembered the first experiments' training. “Up to 50 weeks later, almost all the sharks still remembered which shape to select,” reports BBC Earth.
Sharks have surprisingly long memories
They remembered the maze for up to six weeks. With the shape experiment, they did even better: The majority were capable of recognizing the correct shape six months later, and some where even able to do so after nearly a year had passed.
The sharks learnt both associations in less than 10 days. Memory retention tests suggested they remembered the association for up to 40 days post training illustrating a remarkable capacity for long term memory (Guttridge and Brown 2014).
New behavioural research led by Cranfield ecological scientist's shows that, contrary to historical beliefs, sharks are quick to learn and have good memories.
Most scientists believe the chimpanzee is the “smartest animal in the world,” behind humans.
About 75% of your brain is water, making hydration crucial for sharp thinking, focus, and mood, as even mild dehydration (losing 2% of body water) can impair memory, concentration, and reaction time. The remaining part of the brain is mostly fat, and this water content is essential for creating neurotransmitters and supporting brain function.
There is still a myth that sharks are mindless killers, or lack intelligence. But we do know that they are capable of incredible, complex behaviours – such as recognising familiar sharks, or even problem solving – and Kara believes that many people would be surprised at their ability to learn and adapt.
Emerging evidence shows that some sharks do indeed sleep; perhaps not in a way that would match the recommendations from a TEDTalk, but in different ways that have allowed the over 500 species to persist for over 450 million years on our planet.
The Greenland shark is the animal known to live up to 400 years, making it the longest-living vertebrate, with some individuals estimated to be even older, while the Ocean Quahog clam (Ming) lived over 500 years, holding the record for the longest-lived animal overall.
If a shark charges, fight back
“That happens nine times out of 10.” If that does not work, and a shark tries to bite a swimmer—or even has a limb in its mouth—Naylor says the best course of action is to poke the shark hard in the eyes.
Orcas, commonly known as killer whales, are the only natural predator of white sharks.
Instead of swimming away: stand your ground, face the shark, make eye contact, extend your fins out if you can to ask for space, and if you absolutely need to then push firmly down on the top of the shark's head to guide them away from you, making sure to follow through as they swim away.
Though, pushing from the idea that memory inhibits the ability to encode and recall information, chimpanzees are animals with the best memory. Through ages, these great apes find the interest of humans all around the world because of many similarities between humans and chimpanzees.
Their encounters are a living lesson: friendship and trust can flourish even between humans and creatures once feared, reminding the world that sharks are not monsters, but vital guardians of the ocean...
A shark's sense of smell is powerful – it allows them to find prey from hundreds of yards away. Menstrual blood in the water could be detected by a shark, just like any urine or other bodily fluids. However, there is no positive evidence that menstruation is a factor in shark bites.
While mammals and birds possess the prerequisite neural architecture for phenomenal consciousness, it is concluded that fish lack these essential characteristics and hence do not feel pain.
The leopard shark is the first on our list of least dangerous shark species to be utterly harmless to humans. There has not been a single report of a human being bitten by a leopard shark. They live primarily in shallow waters, are rarely found more than twenty feet below the surface, and feed on crabs and small fish.
With an IQ of about 45, bottlenose dolphins are the most intelligent sea creatures. These marine mammals have a huge brain-to-body ratio, second only to humans.
Sharks, like other fish, have what is usually described as a two-chambered heart – one atrium and one ventricle. Inside a rigid, boxlike cavity, sharks also have a collection sac, called the sinus venosus, and a series of valves, the conus arteriosus, that keep things flowing in the right direction.
“ Some scientists claim that the brain might be active for a short time after someone dies, maybe 7 minutes or more. They're not sure what happens during that time, if it's like a dream, seeing memories, or something else. But if it is memories, then you'd definitely be part of my 7 minutes or hopefully, more.
In debunking the ten percent myth, Knowing Neurons editor Gabrielle-Ann Torre writes that using all of one's brain would not be desirable either. Such unfettered activity would almost certainly trigger an epileptic seizure.
Water and Your Brain: Maintaining Normal Cognitive Function
Staying hydrated is important for overall health, and it plays a key role in supporting the maintenance of normal cognitive function. This includes several areas such as attention, focus and memory.