ヒメダカ胚を用いた石川県河北潟水域の底質影響評価

抄録

Kahoku-gata is located at the north part of Kanazawa plain and straddles between Kanazawa city and Uchinada town, Ishikawa prefecture, Japan. In the present study, toxicities of sediments collected from 29 sites in Kahoku-gata and the surrounding water area were evaluated using Japanese medaka embryos. Those sediments with slight pore water were placed in grass petri dishes without overlying water. Some effects were observed in embryos and hatched larvae exposed to sediments collected in three sites in the eastern waterway (Tobu shousuiro), one site in Kahoku-gata, and several sites in Ohno river and the estuary, respectively. However, from the evaluations, sediment toxicities were not relatively serious in Kahoku-gata and the surrounding area, although we could show slightly high risks to aquatic organisms. The remarkable relevance between their effects and residues of pollutants as polycyclic aromatic hydrocarbons, pesticides, and heavy metals couldn’t be found in the evaluations, and the additional explores to find the harmful pollutants will be required.