If it is on, watch "The Whale That Ate Jaws". It's about the great white's spawning area off the Farallon Islands in Nor Cal. Conflicts between orcas and great whites==guess who wins? The research has now been substantiated from South Africa and Australia.
Once saw a picture of an orca with a large mako shark (12 feet, I think?) crosswise in his mouth. Evidently, juvenile males form "gangs" that specialize in eating sharks.
Remember the scene where they ask Quint the name of his boat and he say "The Orca" and the biologist (Dreyfuss) starts laughing and says "That's the only thing in the ocean that a great white is afraid of!".
While in college, a buddy and I went to Scripps Institute in La Jolla and were watching the Garibaldis swim to the surface from the cliffs (above Windansea)==we also saw several VERY large, very dark shapes gliding from one kelp patch to the next!
The first shark I ever saw while in the water was a blue about 3-4 feet long=swore it was at least a 10 footer. My buddy (same one as above) was an Aussie and just laughed at me! He saw his first attck while a pre-teen in Perth.
The first shark I ever saw was laying in the bottom of a boat.
In a driveway at Gulfport, MS.
It was about 3 feet long and I asked boat owner, is it still alive?
He replied it's been laying there for several hours, but those things are pretty tough.
So I poked at it with a boat paddle.
It put substantial teeth marks in that paddle!
Yep, it's still alive!
It was probably an Atlantic Sharpnose, they are the most common of the sharks in the north Gulf of Mexico.
They are 3 to 4 feet max and tough little critters. They are good eating though.
The north gulf has one of the highest concentrations of sharks in US waters.
If you ever fly low and slow over Destin, FLA, or Gulf Shores/Orange Beach, ALA,
you will be amazed at the sharks you can see in close to the beaches.
Lots of Bull Sharks, these are big boys and implicated in a lot of shark attacks, world wide.
After I retired from the Army, I used to do shark surveys for the National Marine Fisheries Service.