Rockindeano wrote:Arianddu wrote:Holy fuck - just got an email from a friend in Brisbane - people have spotted a bull shark swimming in the floodwaters. There's a fucking shark swimming down her local shopping strip! Crocodiles and sea snakes they expected, but not sharks, given the water is fresh not salt.
Bull sharks can live in BOTH types of waters.
We tend to think of sharks as being ocean dwellers, although there are a handful of species that live in freshwater. But bull sharks can live in both ocean waters and also in fresh water rivers, estuaries, and lakes for some time. They can do this because of their own special ability to adapt the process of 'osmoregulation'. Osmoregulation is the ability of an organism to maintain a constant concentration of water in its body even when its outside environment would normally cause it to loose or gain water. Freshwater and saltwater fish both osmoregulate. But bull sharks can adapt their osmoregulatory processes to survive in a broad range of water salinities, from the salt water of the ocean to the fresh water of a lake.
I would rather tangle with a bull shark than one of those cocksucking sea snakes...those fuckers have more poison than any other snake...I hate them bastards.
That is true about the bull sharks. There have been people through history swimming in rivers with brackish water attacked by sharks. Bull sharks are actually at the top of the lists for most aggressive sharks usually, above Great White sharks. Jaws should have been a bull shark!


