The established freshwater bulls have been known since before I started working with sharks. Studies have shown MASSIVE amounts off urate (and the related ammonia) being released by the sharks body to keep it in check with a low/no salt environment - making FW under human care almost impossible. Back in the early 2000's we looked at bulls specifcially for a display with the idea of the idea of saving on a low salt/ no salt display for them. The water volume needed and the added filtrations required far out weighed the expense of running them in a marine display.
This could develop into something interesting...
- Thread starter Oddball
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My guess is theyve been doing this since there existance...we humans just didnt know about it or notice. I have heard reports of them making it up into the great lakes, sure hope they did lol 
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They can def handle brackish/low salt. In fact, many big shark/fish type displays run lower salinity on purpose just for cost savings and the health advantages for the animals.
My guess is theyve been doing this since there existance...we humans just didnt know about it or notice. I have heard reports of them making it up into the great lakes, sure hope they did lol
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Last I heard they have been reported all the way up the Mississippi and even into the Ohio Rivers. The only sharks I've heard of in the GL were dead and had turned out to be body dumps from ships that came in from the Atlantic.
They are also found thousands of kilometres up he Zambezi and Amazon Rivers.
Do not know, however, if they return to the sea. Possibly yes.
Do not know, however, if they return to the sea. Possibly yes.
The ohio river!...thats just a stones throw away from me, truely amazing creatures that they made it up that far from the coast, water is also pretty cold up here, thats probably the only thing that stopped them from traveling further. They can only tolerate water as low as 60degrees? Is that correct zoodiver? Very dirty/polluted up here too due too all the old steel mills
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The DNR caught 2 young bull sharks here in mn. In the minnehaha river. It is in the middle of st Paul and Minneapolis. They also found a 5' shark in lake peppin. They left that shark be but the other two young ones they took to the moa I believe. The young ones were caught in march. I'll try to find the article on it.
Edit: found the article here is a link.
http://www.nokomiseast.org/yard/light/creeksharks.html
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I loved going to Minnehaha to walk. It's a cool park.
As for temp, bulls are one of the species that maintain a temp higher than the surrounding water, allowing them an advantage while hunting. I've seen them in pretty chilly water - down into the low 50's.
As for temp, bulls are one of the species that maintain a temp higher than the surrounding water, allowing them an advantage while hunting. I've seen them in pretty chilly water - down into the low 50's.
