田辺湾の養魚場水域における底質の有機物負荷の推移

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  • Changes in organic loads on bottom sediments of aquaculture area in the Tanabe Bay
  • タナベワン ノ ヨウギョジョウ スイイキ ニ オケル テイシツ ノ ユウキブツ フカ ノ スイイ

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[Abstract]Organic loads in surface sediments at four sampling stations in an aquaculture area were surveyed between 2012 and 2019. The overall average (±SD) AVS (Acid Volatile Sulfide) during survey period at the sampling station No.717 and No.718，the area with relatively high organic loads，were 0.78 ± 0.31 and 0.29 ± 0.14mgS/g dry sediment, respectively. On the other hand, the overall average AVS values in the station No.719 and No.720 were 0.21 ± 0.12 and 0.18 ± 0.12mgS/g dry sediment, respectively, indicating lower organic loads and relatively well-preserved environmental condition at these stations. Such differences in AVS values between the stations might have been attributed for geographical and environmental conditions of each site. Regardless of the AVS variability, the annual lowest values (values in every March) tended to decrease or were stable. This suggests that the conditions of the bottom sediment in these areas have been, at least, not deteriorated during the study period. Continuous monitoring and survey of organic loads are mandatory for the appropriate use of aquaculture sites as well as for the environmental management.

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