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While the majority of sharks are solely marine, a small number of shark species have adapted to live in freshwater. The river sharks (of the genus Glyphis) live in freshwater and coastal marine environments. The bull shark (Carcharhinus leucas), can swim between salt and fresh water, and are found in tropical rivers around the world.
Its members are – like some other cyprinids – known as "freshwater sharks" or simply "sharks". They are, however, freshwater members of the Osteichthyes lineage which is distinct from the Chondrichthyes lineage of sharks. The description of these animals as "shark" is most likely a reference to the shark-like shape of these popular cyprinids.
Sharks are found in all seas. They generally do not live in fresh water, with a few exceptions such as the bull shark and the river shark which can swim both in seawater and freshwater. [99] Sharks are common down to depths of 2,000 metres (7,000 ft), and some live even deeper, but they are almost entirely absent below 3,000 metres (10,000 ft).
Red-tailed black sharks are omnivorous scavengers who are rarely picky eaters. [2] In the wild they eat insects, small crustaceans, worms, detritus, and plant matter. [2] They will also eat algae off rocks, plants, and décor similar to many popular sucker fish in aquariums. They will scavenge recently deceased fish and animals if given the chance.
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Soupfin sharks, which dwell in temperate waters worldwide, have long been prized for their meat and fins, as their name suggests. Overfishing has left the species critically endangered.
“Where white sharks give birth is one of the holy grails of shark science. No one has ever been able to pinpoint where they are born, nor has anyone seen a newborn baby shark alive,” Gauna ...
The Ganges shark (Glyphis gangeticus) is a critically endangered species of requiem shark found in the Ganges River (Padma River) and the Brahmaputra River of India and Bangladesh. It is often confused with the more common bull shark ( Carcharhinus leucas ), which also inhabits the Ganges River and is sometimes incorrectly referred to as the ...