The marine pelagic environment is the largest aquatic habitat on earth, occupying 1,370 million cubic kilometres (330 million cubic miles), and is the habitat for 11 percent of known fish species. The oceans have a mean depth of 4000 meters. About 98 percent of the total water volume is below 100 meters, and 75 percent is below 1000 metres.[2]
Marine pelagic fish can be divided into coastal (inshore) fish and oceanic (offshore) fish.[3] Coastal fish inhabit the relatively shallow and sunlit waters above the continental shelf, while oceanic fish (which may well also swim inshore) inhabit the vast and deep waters beyond the continental shelf.[4]
Pelagic fish range in size from small coastal forage fish, such as herrings and sardines, to large apex predator oceanic fishes, such as the Southern bluefin tuna and oceanic sharks.[1] They are usually agile swimmers with streamlined bodies, capable of sustained cruising on long distance migrations. The Indo-Pacific sailfish, an oceanic pelagic fish, can sprint at over 110 kilometres per hour. Some tuna species cruise across the Pacific Ocean. Many pelagic fish swim in schools weighing hundreds of tonnes. Others are solitary, like the large ocean sunfish weighing over 500 kilograms, which sometimes drift passively with ocean currents, eating jellyfish.[1]
End quotes from Wikipedia under the heading "Pelagic Fish"
I wanted to demonstrate the kinds of fish living around Japan in schools and the predator chain up from the smallest to the largest. Many of the smallest fish often congregate closer to the shore where larger fish might get beached or have problems. This is one of many defenses to protect against being eaten just like schooling is.
So, if you can imagine a school of very small fish living right at Fukushima which get along with the Shellfish a full dose of 7.5 million times acceptable level of radiation. If some of these little fish survive a few days or even hours at this dose they will then be eaten by larger fish and then larger fish will eat those fish until they are big enough to be eaten by sharks, and other larger predator fish. I'm trying to demonstrate how the radiation could move all over inside these sharks and others.
http://www.whitewatercharters.co.uk/shark-fishing.htm
I wasn't able to find a migration chart of the Pacific migration of charts for sharks. But here for example is above a URL that has some charts of blue sharks in the Atlantic Ocean. Because of this type of migration also existing in the Pacific you can see first hand the problem of sharks and other predators eating 7.5 millions times acceptable radiated fish and then migrating with these fish in their stomachs or digested into their body tissues all over the Pacific Basin and possibly even into the Atlantic Ocean as well.
note: I don't think the blue sharks of the Atlantic Ocean EVER go into the Pacific ocean at all.
However, if you want to be aware for example all the places there are blue sharks in the ocean it looks like every ocean.
from the following wikipedia graph under blue sharks which shows in blue the range of blue sharks in the oceans of earth.
But like I said I think the Atlantic Blue sharks mostly stay in the Atlantic. However, likely there are always exceptions. Just like all people from one country don't necessarily stay in that country because some people like to move all over the earth.
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