The bull shark is a large predatory fish found in oceans and rivers around the world that can tolerate both saltwater and freshwater environments. It matters because its ability to thrive in diverse habitats and its size make it an important part of marine ecosystems, and its presence in both ocean and freshwater areas is notable among shark species.
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bull shark
SPECIES
Maximum longevity: 32 years (wild)
via GBIF · IUCN
The bull shark (Carcharhinus leucas), also known as the Zambezi shark (informally zambi) in Africa and Lake Nicaragua shark in Nicaragua, is a species of requiem shark commonly found worldwide in warm, shallow waters along coasts and in rivers. It is known for its aggressive nature, and presence mainly in warm, shallow brackish and freshwater systems including estuaries and (usually) lower reaches of rivers. Their aggressive nature has led to ongoing shark-culling efforts near beaches to protect beachgoers, which is one of the causes of bull shark populations continuing to decrease. Bull sharks are listed as vulnerable on the IUCN Red List.
Bull sharks are euryhaline and can thrive in both salt and fresh water. They are known to travel far up rivers, and have been known to travel up the Mississippi River as far as Alton, Illinois, about 1,100 kilometres (700 mi) from the ocean, but few freshwater interactions with humans have been recorded. Larger-sized bull sharks are responsible for a large part of nearshore shark attacks, and may be responsible for many attacks involving unidentified species.
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