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Freshwater sharks are sharks that live in freshwater environments. While the majority of sharks are solely marine, a small number of shark species have adapted to live in freshwater. The bull shark, Carcharhinus leucas, can swim between salt and fresh water, and are found in tropical rivers around the world.
Bull sharks caught in freshwater have subsequently been shown to have lower liver densities than sharks living in marine waters. This may reduce the added cost of greater negative buoyancy. [46] Bull sharks are able to regulate themselves to live in either fresh or salt water.
The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
There is no verifiable account of sharks ever reaching the Great Lakes, and multiple hoaxes have been exposed and urban legends debunked over the years. A Great Lakes shark is virtually impossible ...
“The study has shown that bull sharks presumably have no limits to their residential time in freshwater environments such as lakes and rivers, and they are presumably – at least theoretically ...
Since little is known about the behaviour of genuine freshwater river sharks, and since G. gangeticus is critically endangered, contact with humans is very rare. [29] There has been one attack which might be attributable to the Ganges shark, this attack happened in 1868 and was attributed to the shark by Joseph Fayrer. [30]
"We have to think about it in terms of the food web that's out in the ocean: Ultimately, at the very top of that cycle of life are the sharks and if we removed the sharks, smaller fish species ...
They are found in all seas and are common to depths up to 2,000 metres (6,600 ft). They generally do not live in freshwater, although there are a few known exceptions, such as the bull shark and the river sharks, which can be found in both seawater and freshwater, and the Ganges shark, which lives only in freshwater. [5]