Most sharks can't pump air thru their gills like most other fish, they have to force it through the gills by moving forward with their mouths open, kind of like ram air. If they don't move forward they drown, there are a couple that can sit still and pump on their own but most have to keep moving 24/7. I don't know about pulling a fish backwards thru the water but water probably wouldn't go thru the gills like it normally would.

In all the shows I have seen with them jumping they are eating at the time, they might act alot different if their tasty morsel all the sudden rips a hole in their mouth and starts pulling them toward a boat.

Edited for a couple mistakes, 24/7 and would to wouldn't.

 

Yea I've seen footage of them leaping on there and others too, for thier mass tehy can get some air! But they can swim about 25 mph so they can get some speed up. But not when hooked. Ussually it's jumping for food or maybe fun.
It's estimated that a maco Shark can get to 45 mph!

 

Very interesting!!!!! I did not know that.

 

http://video.google.com/videoplay?do...76846870957669

 

Most sharks have to keep swimming forward or they will drown.

 

Here is a vid of Orcas in Puget Sound, any day when your out on the water you have the opurtunity to see them.

http://video.google.com/videoplay?do...arch&plindex=9

 

We've had several Great White sightings in Cayucos lately, and my boss still surfs out there daily Maybe I'll get that promotion sooner than I thought

 

This is a cool video. Great White vs. Killer Whale.

http://www.youtube.com/watch?v=W8GaDuCvYbE

 

definately a Mako.

Teeth are wrong. Mako's have skinny curved teeth to help capture and hold their prey: fast moving marlins and tuna. Whites have triangular teeth.

Snout is different, White's snouts are a bit more blunt.

Dorsal is wrong. White's have a dorsal that is more like a right triangle.

I've seen the pic about a year or so ago, but i'll have to say that is one helluva Mako.

 

Some of the reef sharks sleep during the day in underwater coral caves.

When we lived in Kona, Hawaii. My sister was scuba diving and entered one of these cave just north of the old airport. Somewhere's there is a picture of her laying down beside two white tip reef sharks, The sharks are about 10 feet apart and are about 8 feet long.

I must hunt that picture down.

http://www.metacafe.com/watch/836017...ng_under_reef/


edited to add this short video link of sleeping sharks videod by a diver.

 

Mako Shark Destin Fishing Rodeo

 

you sure they are sleeping. the nurse shark is the only shark i know that can stop moving

 

yes, there is enough water current to ventilate the gills.

 

ohh didnt know that, but have you ever seen a nurse shark those things are wicked dangerous

 

The nurse shark is a bottem feeder of debris, crabs lobster etc.. they can be found in water as shallow as three feet, They hang around shallow reefs in tropical and sub tropical waters.

They can become dangerous if provoked or you are in the water thrashing around like you are drowning.