The bull shark, carcharhinus leucas, has been spotted in some funky and unexpected areas, including rivers! bull sharks are euryhaline (heupel & simpfendorfer, 2008), which means they are able to tolerate a range of salinities. while they can tolerate it, they don’t necessarily favor a freshwater environment. a study by heupel & simpfendorfer (2008) found that sharks were less likely to be found in parts of an estuary with salinity levels lower than 7. estuaries and lagoons with mixed fresh and salt water are occupied solely by newborns and juveniles; pregnant females return to the brackish water to give birth (snelson et al., 1984). so how exactly can they tolerate a freshwater environment? while in freshwater, the shark produces less urea and doesn’t hold the urea and other body fluid solutes for too long, therefore decreasing their osmolarity (hammerschlag, 2006). while the young sharks stay in the shallow and brackish environments, adult sharks can be found at depths up to 150m. bull sharks consume a variety of prey ranging from birds to catfish, depending on what type of environment they are in. while they are commonly found in warm tropical areas, they are seasonally found in cooler waters and have a wide distribution!
post by: @nikitapatel_23
photo by: @juansharks
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