Toxic evaluations of sediments in Tokyo Bay, Japan, using Japanese medaka embryos.
Toxic risks of sediments collected from seven sites in Tokyo Bay were evaluated using Japanese medaka embryos. Those sediments with slight pore water were placed in grass petri dishes without overlying water. The most remarkable effect in the field sediment was to cause hatching delay in embryos, and the longest time until hatching took was 12.5 ± 1.6 days post-fertilization (dpf), although that in control group was 10.1 ± 0.7 dpf. A significant delay in hatching was observed at four sites. Because total carbon concentrations were relatively high in sediments at three of these four sites, several chemicals were expected to be residues in these sites and could cause their delay. Although extreme mortality was not observed at all sites, sediments collected from the site close to Kawasaki city induced 10 % mortality. Polycyclic aromatic hydrocarbon (PAH) concentrations were remarkably high at this site compared with other sites, and thus PAH toxicities could be causing the mortality. Concentration of heavy metals such as cadmium, copper, lead, and zinc in sediments were also determined, but no clear relationship was found between toxicities to embryos and the distribution of their concentrations.
Education and Research Center for Marine Resources and Environment, Faculty of Fisheries, Kagoshima University, 50-20 Shimoarata 4-Chome, Kagoshima, 890-0056, Japan. uno@fish.kagoshima-u.ac.jp.
Seiichi
S
Uno
Education and Research Center for Marine Resources and Environment, Faculty of Fisheries, Kagoshima University, 50-20 Shimoarata 4-Chome, Kagoshima, 890-0056, Japan.
Emiko
E
Kokushi
The United Graduate School of Agricultural Sciences, Kagoshima University, 4-50-20 Shimoarata, Kagoshima, 890-0056, Japan.
Machi
M
Kawano
School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, 11794-5000, USA.
Anne E
AE
McElroy
Education and Research Center for Marine Resources and Environment, Faculty of Fisheries, Kagoshima University, 50-20 Shimoarata 4-Chome, Kagoshima, 890-0056, Japan.
Jiro
J
Koyama
D000818:Animals; D061006:Bays; D002104:Cadmium / Q000633:toxicity; D003300:Copper / Q000633:toxicity; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007564:Japan; D019216:Metals, Heavy / Q000032:analysis / Q000633:toxicity; D009990:Oryzias; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000633:toxicity; D012989:Soil Pollutants / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
D019216:Metals, Heavy; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D002104:Cadmium; D003300:Copper
Fish embryo development; Hatching; Heavy metals; PAHs; Sediment toxicity