Program and Abstracts(PDF)
Program and Abstracts(PDF)
Program and Abstracts(PDF)
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Poster presentation 19<br />
SEDIMENT CHARACTERIZATION AND REMEDIATION OF SHIRAISHI LAKE<br />
OYSTER FARM<br />
Sheila Mae S. Sant<strong>and</strong>er – De Leon 1* , Takumi Ide 1 , Takeshi Yoshikawa 1 , <strong>and</strong> Hiroto Maeda 2<br />
1 Faculty of Fisheries, Kagoshima University, 50-20 Shimoarata 4-Chome, Kagoshima 890-<br />
0056, Japan<br />
2 Faculty of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507<br />
Japan<br />
* Email: sheila.sant<strong>and</strong>er at yahoo.com<br />
Environmental deterioration such as eutrophication <strong>and</strong> harmful algal blooms has been<br />
coupled with aquaculture to cause massive mortality of cultured organisms. Rapid<br />
developments in aquaculture have been observed for the past decades in Japan; however,<br />
increasing the production with sustainable aquaculture environment remains to be a challenge.<br />
Recently, sediments in Shiraishi Lake, located in Owase, Mie, Japan, have been shown to be<br />
affected by oyster aquaculture. The present study aims to characterize the condition of the<br />
sediments in Shiraishi Lake <strong>and</strong> suggest a possible measure to remediate the contaminated<br />
environments.<br />
Sediment core samples were collected from three stations around the oyster farm of Shiraishi<br />
Lake in October <strong>and</strong> November 2009; <strong>and</strong> January 2010. Grain size, moisture contents, <strong>and</strong><br />
acid volatile sulfide-sulfur (AVS-S) were measured. The surface 0-1 cm layer of the sediment<br />
was characterized by a black color, 93% of silt, <strong>and</strong> 69.94±4.54% of moisture content.<br />
Averaged AVS-S from three sampling months was 1.44±0.29 mg g -1 dry weight. In the<br />
months of October <strong>and</strong> January, however, AVS-S concentrations in some sampling points<br />
reached 2.0-2.5 mg g -1 dry weight, a threshold concentration based on the Japanese<br />
environmental criterion on the Law to Ensure Sustainable Aquaculture Production. The AVS-<br />
S also showed an increase in concentration from 10 cm layer depth to surface layer, an<br />
indication of accumulation of organic matter in the area. These results <strong>and</strong> the preceding<br />
massive oyster mortality in the area suggest that the sediment of Shiraishi Lake has been<br />
highly affected by organic pollutants. At present, a remediation experiment of the Shiraishi<br />
Lake sediment by potential chemical remediation agents including titanium oxide <strong>and</strong><br />
magnesium hydroxide is being conducted.<br />
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