Of all the sharks, the biggest threat to humans is not the great white shark, but the bull shark, because it is the only shark that can live in fresh water, and they are also known as "the most dangerous sharks in the world".
<h1 class="pgc-h-arrow-right" > how dangerous bull sharks are</h1>
The official name of the bull shark is the bull shark, which is a shark in the family True Shark and the genus True Shark. It is named for its strong, cow-like body, broad, flat "cow nose", and super aggressiveness. It can grow up to 11.5 feet and weigh between 200 and 500 kilograms, which is smaller than the size of the great white shark.
Sharks have disproportionately large mouths, and their upper and lower teeth are not only serrated at the edges but also have a clear division of labor: the sharp lower teeth can stand upright or slightly oblique, making it easy to hold the prey and firmly control the prey; the triangular serrated upper teeth are used to cut, swallow food, and can also pierce the prey, thereby tearing the prey's flesh.
Of all the shark species today, the bull shark has the most powerful bite force, even stronger than the infamous great white shark, and the study found that the bull shark's size, jaw and jaw muscles allow them to produce 1300 pounds of strength when biting.
Bull sharks prefer to inhabit shallow waters less than 25 meters deep, so they may be encountered in estuaries, bays, and harbors. Bull sharks appear to be slow to move when they swim slowly on the seabed, but they can explode quickly, moving at speeds of more than 19 kilometers per hour over short distances, coupled with an amazing bite force, which makes bull sharks the top killers in the ocean, as long as they are living creatures in the sea, such as various fish, sharks, stingrays, cephalopods, crabs, seabirds, turtles, seals, dolphins, whales, animal carrion, etc., it is almost no one to refuse. The most exaggerated thing is that even other species of sharks are one of their food.
In addition, the bull shark is also the only shark that can live in freshwater waters, there is a special internal organ near the tail that can store salt, and the specialized kidneys can maintain the balance of salinity in the body by regulating the content of salt and other substances in the blood, so that the bull shark can live in the freshwater area for a period of time. So in some lagoons, or rivers and lakes we may also see them.
Bull sharks have been found in rivers close to the sea, such as the Ganges River in India, the Gulf of Mexico in the Americas, the Zambezi River in Africa, and the Mississippi River in the United States, and people have even seen bull sharks 3,000 kilometers upstream of the Amazon River.
The reason why the bull shark evolved this ability is to improve the survival rate of the cubs, the baby shark is born about 70 cm long, it takes about 10 years to reach maturity, during which time, it is easy to be hunted by other sharks and large predators.
Bull sharks produce their pups in coastal lagoons, estuaries and other low salinity estuaries, and since most sharks can only survive in salt water, other sharks and predators cannot treat their pups. The use of fresh water as a protected area allows the cubs to grow and mature, which is one of the main reasons why bull sharks have evolved the ability to adapt to fresh water.
After the bull shark enters the river, due to changes in hormone secretion, its temperament will become more ferocious, even hippos and crocodiles, will become the object of their hunting, it can be said that it is invincible in fresh water.
In fresh water, humans often rarely think of the presence of sharks, and bull sharks have a violent personality, found the existence of humans, even if humans do not have any offensive moves, they will attack under the impetus of curiosity, in addition, bull sharks will often suddenly become excited and make unpredictable behavior, which is why they attack humans.
Among the incidents reported by humans every year in which sharks injure people and hit ships, bull sharks have more records of accidents than great white sharks, and it can be said that bull sharks are the most dangerous sharks for humans.
The famous movie "Jaws" is based on real cases, in 1916, in the United States, there were 5 shark attacks on humans in 12 days, resulting in 4 deaths, the case handling staff at the time identified the culprit as the great white shark, and later after in-depth investigation by scientists, it was found that the bull shark was the real perpetrator, and the great white shark became the "back pot man".
<h1 class= "pgc-h-arrow-right" > the bull shark crisis</h1>
While bull sharks attack humans, humans are also the biggest threat to the survival of bull sharks, and because it lives in estuaries and offshore areas close to populations, it is vulnerable to human influences, and in recent years the average size of the bull shark caught in its beach net has dropped significantly, which is not a good sign for the population of this species in South Africa. As of 2009, the bull shark is not legally protected in any part of its range.
How to carry out targeted protection of bull sharks should be a matter of agenda.