Trophic transfer of (110m)Ag in the turbot Scophthalmus maximus through natural prey and compounded feed.
Industrial incidents can result in radionuclide release in the environment, among which (110m)Ag. Indeed, under particular circumstances, non-negligible amounts of (110m)Ag have been measured in the marine environment (as observed in Fukushima Dai-ichi incident). This element can therefore be accumulated by aquatic organisms through different pathways including the trophic transfer. The present study aimed at examining the variation of (110m)Ag assimilation efficiency (AE) by turbots, Scophthalmus maximus, when exposed through different feeds. Pulse-chase feeding experiments were carried out in mesocosms, using radiolabelled feeds (natural prey and commercial pellets). Depuration kinetics of (110m)Ag over 21 days were generally fitted by a two-component exponential model; the ingested radioelement was poorly assimilated by turbots regardless of the food item that was used (AE always <3%). Concentration and subcellular distribution of (110m)Ag in prey did not seem to influence its assimilation by turbot. These results suggest that physiological mechanisms could occur in fish that would prevent the transfer of (110m)Ag from gut lumen to internal organs (e.g. (110m)Ag neutralization in the lumen of the stomach, detoxification mechanisms occurring in the gut).
International Atomic Energy Agency, Environment Laboratories (IAEA-EL), 4a Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco; Littoral Environnement et Sociéités (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, F-17000 La Rochelle, France.
Simon
S
Pouil
International Atomic Energy Agency, Environment Laboratories (IAEA-EL), 4a Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco.
Michel
M
Warnau
International Atomic Energy Agency, Environment Laboratories (IAEA-EL), 4a Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco.
François
F
Oberhänsli
International Atomic Energy Agency, Environment Laboratories (IAEA-EL), 4a Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco.
Jean-Louis
JL
Teyssié
International Atomic Energy Agency, Environment Laboratories (IAEA-EL), 4a Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco. Electronic address: m.metian@iaea.org.
Marc
M
Metian
D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet / Q000662:veterinary; D005412:Flatfishes / Q000378:metabolism*; D020387:Food Chain; D011868:Radioisotopes / Q000378:metabolism*; D017747:Seafood / Q000032:analysis*; D012834:Silver / Q000378:metabolism*
D011868:Radioisotopes; D012834:Silver
Accumulation; Aquaculture; Feeds; Radionuclides; Silver