What is the top predator in the ocean besides man?

[Witis]

Damnit, you stole my answer!

This paragraph illustrates the whole problem withe the premise of your question.

You start by saying the "top of the food chain". Putting aside Shaggy's correct assertion that there's no such thing and pretending there is for a second, you then go on to say the fastest, most poisonous etc. What's to say those things corellate in any way? Why does the one that eats everything else have to be the most physically endowed? And if you want to judge by physical endowment then you need to somehow rank those endowments and provide a scoring mechanism, otherwise any answer given will be disputable as there's defined set of rules. It's like watching the old Gladiators shows where John Anderson would randomly disqualify the gldiators and contestants for rules that nobody had mentioned up to that point... because there were no rules. Don't get me wrong, it made for great TV and we all enjoyed staring at Jet's rack but it hardly constituted a properly competitive sport.

That's the fun of it, trying to work out all the strengths and weaknesses in an objective manner and then determining which strategies currently dominate. It doesn't have to be the most physically endowed it could also be the most intelligent or the best all rounder.

Also, I think you're concept of top predators predating on each other is also flawed. I risk being corrected on this one, particularly by Shaggy who's a fish biologist, but I don't believe top predators generally do that. They may kill each other to eliminate competition and may even feed upon teh resulting corpse, but top predators rarely (probably never) represent each other's primary food source.

If there is no competition over prey it is unlikely that there is any need for two predators to fight each other except to try to assert dominance which does occur in some cases, the Orcas for instance are very prone to attacking and humiliating many oceanic species although the Orcas are not as tough as they make out and these showy displays are more a symptom of being placed in a situation where they largely have no escape strategy against several oceanic predators and are therefore forced into an primarily offensive strategy which includes intimidation and humiliation. In cases where there is no or limited data regarding the interactivity between two species there are sometimes clues regarding the probable outcome of any conflict which helps coming to a final determination.

Finally this "As these are all oceanic creatures they should all be in their element" is utterly wrong. That's like saying the land constitutes a constistent enviroment everywhene on the planet. It doesn't and neither does the sea. An arctic ocean presents an utterly different enviroment to a tropical one. A busy shipping lane will affect it. A reef. An area with shallows as opposed to a deep sea trench.

Nonetheless they are all oceanic creatures and water is their element by definition. To me it doesn't matter if they only live in reefs, or only in tropical or artic environments, what I am looking for is a creature's capacity to make it as the world's best oceanic predator.