Topic...

Its not likely, I mean if you think about the WAY the world got irradiated.
it was from bombs, they bombed the USA, they didnt just straight up bomb the ocean.


But the beaches would likely to have some irradiation, but probably minor.

It's 200 years. Much of the Atlantic and Pacific Oceans would have a bit of radiation, enough to cause mutations for organisms with small genomes or along those lines like fishes. But it would be like a 0.5 rads per second scenario. The arctic ocean would not have any radiation because of the frigid cold and nowhere near the main bombing sites. The oceans near the bomb sites(Atlantic, Pacific, Indian, etc.) would be irradiated because of the closeness to the bomb sites and the ocean currents.

They'd be tainted by all the Strontium 90, Carbon 14, and Cobalt 60 ash blown from the continents for decades, if not a century. It's all one big loop for radiation to travel from ground to air to water.

Right, even though no one would aim at the oceans-rather they'd aim for civilizations-there'd still be effects from the radiation in the air. Which would eventually fall into the ocean. Plus there are islands, like Japan, that were likely nuked and are surrounded by oceans/water. And there are coasts. The U.S., in particular, was severely bombed throughout the coasts on both sides of the country. The radiation in the sand/ground there would likely be hit by the waves from the ocean, and drug back with those waves. So that, no matter what, the ocean would at least be partially irradiated. It's even documented, in a way, by a document in a terminal from Rivet City-where health problems were stated to have come up on the occasion that someone was stupid enough to try to eat the fish around the ship. Which were irradiated-and one can easily gather that they became irradiated in their irradiated environment; which is water.

So I would assume all of them are irradiated-though I bet it would also vary. Again, the coasts of the U.S. would likely have highly irradiated water. Both from air and ground.

No. The oceans would not have any significant level of radiation, especially after 2 centuries. In real life humans have done underwater weapons testing for decades now. Our seas may have a slightly higher rad count than a few centuries but nothing to be worried about. The Earth has a natural cleaning cycle built into the oceans. Atomic fallout is dangerous but not 200 years+ dangerous. Also there is no way that any weapons could produce so much rads that they poison all the water all over the world forever.

Probably Far Out From Land Would Be Fine, Like The Middle Of Nowhere.
It Be Cool To Se A Mutant Whale Fight A Mutant Octopus!

rad shark vs rad whale

I remember when I was visiting San Francisco in Fallout 2, one of the Shi fisherman mentioned something about having two-headed fish for dinner. So my guess is that just like the rest of the world, the ecosystem of oceans have been changed forever due to radiation, But not to the amount that you get from the water supply at DC.

Given the oceans have much much much more volume for radioactive dust particles to disperse into than the land has surface, and that there are unlikely to be that many priority nuke targets in the water, I wouldnt expect them to have a serious rad count, except where there is a seriously significant target (Perl Harbour?)

I would say no because the radiation/fallout would sink to the bottom of the oceans. Its been 200 plus years and it takes a very long time for water at the bottom of the ocean to get to the surface, something like 2000 years or so.

The radiation would come from fallout, fallout won't be radioactive for long, so no.