USA military well aware that ionising radiation accumulates in organisms

The Bioaccumulation of contamination in plankton, US Armed Forces, 1955 , Paul Langley’s Nuclear History Blog Quote (emphasis added) “Page 59. The problem of radioactive particles falling into the ocean raises the question of their availability to this portion of the biosphere. Plankton normally found in sea water are consumed in large quantities by fish.

These plankton concentrate mineral elements from the water, and it has been found that radioactivity may be concentrated(Page 60) in this manner by as much as a thousand fold. Thus, for example, one gram of plankton could contain a thousand times as much radioactivity as a gram of water adjacent to it. The radioactivity from these plankton which form a portion of fish diet tends to concentrate in the liver of the fish, and, if sufficiently high levels of contamination are encountered, could have a marked effect upon the ecology of an ocean area.

http://www.ncbi.nlm.nih.gov/pubmed/7752105

J Radiat Res. 1994 Dec;35(4):213-21.
Concentration factors for Cs-137 in marine algae from Japanese coastal waters.
Tateda Y, Koyanagi T.
Source
Abiko Research Laboratory, Central Research Institute of Electric Power Industry, Chiba, Japan.
Abstract
Concentration factors (CF: Bq.kg-1 in wet algae/Bq.kg-1 in filtered seawater) for Cs-137 in Japanese coastal algae, were investigated during 1984-1990. Cs-137/Cs(stable) atom ratios were also examined to clarify the distribution equilibrium of Cs-137 in marine algae and sea water. The CFs in marine algae were within the range of 5.4 approximately 92, and the geometric mean of CF was 28 +/- 2 (standard error) in Japanese coastal species. The CFs in edible species were within the range of 5.4 approximately 67, and the geometric mean of CF was 26 +/- 4 (standard error). The values of Cs-137/Cs atom ratios in marine algae and sea water indicated that Cs-137 reached an equilibrium state in partition between algae and sea water. Therefore, the CF value obtained in the present study can be regarded as an equilibrated value. Our results showed that the CF for Cs-137 in Japanese coastal algae were consistent with the Japanese guideline CFs, but were smaller than the recommended value by IAEA.
PMID: 7752105 [PubMed – indexed for MEDLINE] Free full text

end quote.

http://www.dutchdailynews.com/greenpeace-in-japan/………….https://nuclearhistory.wordpress.com/2013/03/16/the-bioaccumulation-of-contamination-in-plankton-us-armed-forces-1955/

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