Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
Here is another link:
orca kills a great white shark - Bing video
I have witnessed the aftermath of a marlin v. shark. We were fishing off of Cabo San Lucas. We heard over VHF that a marlin had killed a shark. The boat was close aboard to our vessel. We altered course to hopefully catch a glimpse. We saw the marlin trying to dislodge his bill from the shark. It did and swam off. Leaving the dyeing shark behind.
A healthy marlin has no known predators in the ocean. They are too fast. Big marlin can eat rather large tunas (and sharks?). As far as I know, the only other fish that does not have a predator capable of catching it is the Wahoo, again, way too fast.
So who is the apex predator of oceans? I don't think it is the shark.
thanks for the thread,
mark