Mr. R. Emmett Johnson:
A lot of the salmon in the Icelandic rivers produced in hatcheries and released just before or after they become smolts, so they are not "truly" wild fish even though their "parents" might have been.
And I am pretty sure you are wrong in assuming that that the icelandic salmon are small in size because they are all killed when the are young/first time spawners. I think it is more along the lines of genetics that you will find the answer to the size difference - if you look at Norway you will find rivers that historically "never" produced big fish and rivers that always have produced big fish. The size and shape of anadromous fish are dictated by the conditions in the rivers they spawn in.
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