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Joined: Oct 2003
Posts: 764
Lunker
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Lunker
Joined: Oct 2003
Posts: 764 |
This is something I've been wondering about. As the article says, bull sharks commonly enter and live in freshwater. They've been reported north as far as Illinois.
Has anyone seen any current reports of bull sharks in freshwater?
Norm Kopecky
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Joined: Sep 2003
Posts: 13,688 Likes: 281
Moderator Ambassador Field Correspondent Hall of Fame 2014 Lunker
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Moderator Ambassador Field Correspondent Hall of Fame 2014 Lunker
Joined: Sep 2003
Posts: 13,688 Likes: 281 |
That's an interesting article.
I wonder if that was released from someone's fish tank. That still doesn't answer how it survived in fresh water.
I guess we know that every living creature probably continues to evolve.
Excerpt from Robert Crais' "The Monkey's Raincoat:" "She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."
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Joined: May 2004
Posts: 13,939 Likes: 268
Moderator Lunker
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Moderator Lunker
Joined: May 2004
Posts: 13,939 Likes: 268 |
Would a salt water fish be any more likely to survive all those omosis problems if the salinity of it's water was gradually reduced from salt to fresh?
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling
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Joined: Jun 2002
Posts: 352
Lunker
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Lunker
Joined: Jun 2002
Posts: 352 |
Lake Medina isn't very far from San Antonio so this has received a lot of coverage locally. Texas Parks and Wildlife believe that this was prank that someone pulled on the fishermen. There is no way the sharks can get to this lake so the best reason is that someone had caught the sharks at the gulf and then brought them back and went out and put them on the jug lines.
It would still suprise me to pull up my jug and see a shark.
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Joined: Oct 2003
Posts: 764
Lunker
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Lunker
Joined: Oct 2003
Posts: 764 |
Theo, a long, long time ago, a professor of mine studied bull sharks at lake Managua, Nicaragua. These sharks swim up about 100 miles of the Rio San Juan and live in this freshwater lake for months and even years some times. I don't know what the current conclusions are. World wide, bull sharks attack people more often than any other species because of their ability to live in freshwater where they come into contact with people more often.
Norm Kopecky
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Joined: Aug 2004
Posts: 1,054 Likes: 12
Lunker
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Lunker
Joined: Aug 2004
Posts: 1,054 Likes: 12 |
Theo, don't let Bruce read that. He already has high salinity in his water and large bluegill. I am afraid he will try to create a bluegill/shark cross.
Just a Pond Boss 'sponge'
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Joined: May 2004
Posts: 13,939 Likes: 268
Moderator Lunker
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Moderator Lunker
Joined: May 2004
Posts: 13,939 Likes: 268 |
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling
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Joined: Apr 2003
Posts: 1,097 Likes: 18
Lunker
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Lunker
Joined: Apr 2003
Posts: 1,097 Likes: 18 |
OK, I'll push the salinity levels...I asked this before on the board without a reply. If the Bass Pro Shop guys can maintain an aquarium with a huge "Texas Lunker" 16 lb Bass side beside Redfish, why can't pondowners do the same ? Geez, Redfish would be awesome fighters, and even better "blackened" in the skillet. What's the scientific mix ?
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Joined: Jun 2005
Posts: 2,365
Lunker
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Lunker
Joined: Jun 2005
Posts: 2,365 |
There are many types of freshwater sharks and rays. I was shocked when I caught a freshwater flounder in the Tangipahoa river. There are some fair sized sharks in the Amazon. They all have 1 thing in common: They swim in water that communicates with the oceans. Maybe an Atlantic sharpnose can swim up river, but it can't swim over dirt!
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