![]() Ontogenetic changes in food preference were recognized in nine species ( Hypoatherina valenciennei, Lateolabrax japonicus, Trachurus japonicus, Sillago japonica, Sphyraena japonica, Paralichthys olivaceus, Heteromycteris japonica, Paraplagusia japonica, and Takifugu niphobles). To clarify the feeding habits and major food sources of sandy beach fishes, the gut contents of 55 fish species collected on a sandy beach at Fukiagehama, South-West Kyushu Island, Japan, were examined. Nakane, Yukinori Suda, Yusuke Sano, Mitsuhiko (author)įood habits of fishes on an exposed sandy beach at Fukiagehama, South-West Kyushu Island, Japan The cobalt-60 introduced to sea from nuclear explosions seems to be relatively constant in coastal seawater since specific activities are distributed in a narrow range in spite of kind, shell size and location. It has become apparent that Septifer virgatus has a tendency to concentrate cobalt with growing but Mytilus edulis is opposite. The radioactivities in mussels show the same trend as stable cobalt. There are not so large difference in cobalt content depending on shell size so long as comparing them at the same location. The concentrations of cobalt in Septifer virgatus are one order higher level than that in Mytilus edulis. Stable cobalt concentrations were determined by colorimetric method. Activities of 60 Co were measured by a low-background β counter after purified by means of chemical separation and electrodeposition. The mussels were collected from 7 locations in 1983 and classified 2 or 3 groups depending on their shell size at each location. Two kinds of mussel, Septifer virgatus and Mytilus edulis, were collected from Kyushu island, Japan, in order to elucidate a background level of 60 Co, which is one of the most significant radionuclide for environmental monitoring around a nuclear power plant. ![]() Momoshima, Noriyuki Shiki, Atsushi Takashima, Yoshimasa Maki, Takao Koriyama, Munehiro Shimozono, Seika Imamura, Hiroka Nakamata, Kojiro. International Nuclear Information System (INIS) Radioactive and stable cobalt concentrations in mussel in Kyushu island, Japan ![]()
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