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Sharks in rivers * 1
    #12662903 -

I'm guessing the majority of the Pub aren't as much of fish nerds as I am, so I felt like asking a question and feeding you some knowledge

Were you aware that one of the most aggressive and deadly sharks in the world has recently adapted to live in freshwater?

This is a bull shark:


Since the 1930s bull sharks have been recorded moving up rivers and there have been many attacks on humans... IN RIVERS... All over the world.  And by all over the world I mean from Australia to New Jersey, USA. A series of bull shark attacks in New Jersey were actually the inspiration for the Jaws novels/movies.

They have been found as far as 2,200 miles away from an ocean in rivers. They can reach a length of 13 feet and are more than capable of taking down just about any human swimming in a river. In fact, some scientists in South Africa caught the largest bull shark known to man in freshwater

These fuckers have even been recorded as far north as the mouth of the Great Lakes in the Mississippi River. They've even found them in lakes in some countries.

I'm gonna think twice about swimming in a river next time I get the chance... But I'll probably do it.

Anyone else kinda freaked out by bull sharks?

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Re: Sharks in rivers [Re: Gumby]
    #12662910 -

Um dude....you just gave me like the coolest band name idea ever.

Lol

Sharks In Rivers

That'll be a band some day....


--------------------
She's well acquainted with the touch of the velvet hand
Like a lizard on a window pane
The man in the crowd with the multicoloured mirrors
On his hobnail boots
Lying with his eyes while his hands are busy working overtime
A soap impression of his wife which he ate
And donated to the National Trust

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Re: Sharks in rivers [Re: JesusYodiHomeboy]
    #12662923 -

DO IT! I'd come see ya.

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Re: Sharks in rivers [Re: Gumby]
    #12662926 -

They killed a bunch of couple people not too far away from me like 100 years ago.  I'm much more worried about dying in a car accident and I still drive.  Rivers in NJ are so god damn polluted though I won't swim in them unless I'm shit faced drunk.  Probably more likely to get caught in the current and drown.  I will gladly mount a dead shark though if I find one dead on the side of the river.


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Re: Sharks in rivers [Re: Gumby]
    #12662955 -

That's cool, but if they run into a beaver dam, wouldn't that stop them from going any further?

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Re: Sharks in rivers [Re: fapjack]
    #12662958 -

watched a show on it about a year ago. bull sharks were offing kids in a river a long ass time ago

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Re: Sharks in rivers [Re: Gumby]
    #12662974 -

I did not know that, Gumby. Wow. Thanks for shattering my up until now safe feeling about jumping in the river. I swim across lakes and rivers all of the time. I freak out when a branch or something brushes up against my leg anyway.

Does it mention how they are able to adapt and why other salt water species haven't done it?


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:murray:

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Re: Sharks in rivers [Re: nooneman]
    #12662979 -

nooneman said:
That's cool, but if they run into a beaver dam, wouldn't that stop them from going any further?


Not necessarily, especially if the river is flooded. They can jump too.

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Re: Sharks in rivers [Re: Gumby]
    #12662980 -

Oh yea.. the terrors of the deep ocean-- brought to the safety of the shallows..

I think I'm safe up in Canada but you never know..

:tinfoil:

They also hunt in schools sometimes...




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Re: Sharks in rivers [Re: Gumby]
    #12663010 -

Gumby said:
nooneman said:
That's cool, but if they run into a beaver dam, wouldn't that stop them from going any further?


Not necessarily, especially if the river is flooded. They can jump too.


In that case I'm staying the fuck away from rivers :uhoh:

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Re: Sharks in rivers [Re: blissedout]
    #12663019 -

blissedout said:
Does it mention how they are able to adapt and why other salt water species haven't done it?


Yep. They have a gland called the rectal gland (great name, btw) which enables them to regulate the salt content of their body. Sensory organs all over the body detect salt content of the water and the gland adjusts the salt content of their body so that they can survive. Perfectly adapted for both salt and fresh water.

From what I've read this adaption has happened within the past ~200 years and they're getting much better at switching between the two. Scary part is only the large ones are able to make the fresh-salt switch easily.

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Re: Sharks in rivers [Re: Gumby]
    #12663023 -

Yes.

I don't like it one bit.


--------------------
    classic LOVELINE

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Re: Sharks in rivers [Re: Gumby]
    #12663050 -

That's pretty damned interesting. A little scary, too. I always felt safe in lakes and rivers, because the only thing that you really needed to worry about were water moccasins, and alligators. Alligators are pretty rare in middle Alabama rivers, so snakes were the biggest thing to watch for. Lake water is always so dark, too. Freaky!


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:murray:

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Re: Sharks in rivers [Re: blissedout]
    #12663071 -

blissedout said:
That's pretty damned interesting. A little scary, too. I always felt safe in lakes and rivers, because the only thing that you really needed to worry about were water moccasins, and alligators. Alligators are pretty rare in middle Alabama rivers, so snakes were the biggest thing to watch for. Lake water is always so dark, too. Freaky!


Most of the lakes I go swimming in are in northern Ontario, and they are essentially gashes dug into the rock of the Canadian Shield by glaciers.

This gives you lakes that are rock bottomed [no sand], very steep [near vertical drops often], very deep, and black water.

I'm always wondering what creatures may be chilling at the bottom...


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Re: Sharks in rivers [Re: blissedout]
    #12663107 -

blissedout said:
That's pretty damned interesting. A little scary, too. I always felt safe in lakes and rivers, because the only thing that you really needed to worry about were water moccasins, and alligators. Alligators are pretty rare in middle Alabama rivers, so snakes were the biggest thing to watch for. Lake water is always so dark, too. Freaky!


Eh, in rivers and lakes cottonmouths (water moccasins) are not an issue, I've caught many and I doubt you'll have issues in anything more than 3-4 foot deep water near downed trees and plants. I'd be MUCH more afraid of alligators in your area. Shit, we even get them up around Lake Lanier in GA from time to time. I wouldn't dismiss them at all.

But when it comes to rivers, even in NJ, I'll probably think "you know, it would really suck if a bull shark grabbed my leg while I'm swimming." I'd be fucked.

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Re: Sharks in rivers [Re: Gumby]
    #12663128 -

They best stay away from the Adirondacks. :crankey:


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m00nshine is currently vacationing in Maui. Rumor has it he got rolled by drunken natives and is currently prostituting himself in order to pay for airfare back to the mainland but he's having trouble juggling a hairon addiction. He won't be back for a long while.

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Re: Sharks in rivers [Re: THE KRAT BARON] * 1
    #12663172 -

i know about this.

i love the show River monsters on animal planet.


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Nature is my church and walking through it is gospel. It tells no lies and reveals all to those who look, and listen, closely.
-Karode

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Re: Sharks in rivers [Re: Gumby]
    #12663185 -

Recently usually means within the past few years.. not 80 years ago.


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Re: Sharks in rivers [Re: citricacidx] * 1
    #12663239 -

Depends if you're talking people speak or biology speak. An adaption made within the past 1000 years is recent in the scope of biology.

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Re: Sharks in rivers [Re: Gumby]
    #12663273 -

Gumby said:
blissedout said:
That's pretty damned interesting. A little scary, too. I always felt safe in lakes and rivers, because the only thing that you really needed to worry about were water moccasins, and alligators. Alligators are pretty rare in middle Alabama rivers, so snakes were the biggest thing to watch for. Lake water is always so dark, too. Freaky!


Eh, in rivers and lakes cottonmouths (water moccasins) are not an issue, I've caught many and I doubt you'll have issues in anything more than 3-4 foot deep water near downed trees and plants. I'd be MUCH more afraid of alligators in your area. Shit, we even get them up around Lake Lanier in GA from time to time. I wouldn't dismiss them at all.



Meh, in the lakes/rivers in and around Montgomery, there aren't many gators, at all. Also, I have seen many moccasins swimming ACROSS the river/lake and they are very aggressive! They will even go so far as to come after you even if you aren't in their path. My uncle almost blew a hole in his boat early one morning because a moccasin had crawled into his boat.:lol:


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:murray:

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