田辺湾の養魚場水域における底質の有機物負荷の推移
中瀬玄徳 1 ,宮嶋暁 2 ,宮里子茂 ~2 ・和泉健~ 2*.向井良夫3, 道裏ひかる2・那須敏朗 4
Changes i n o r g a n i c l o a d s on b o t t o m s e d i m e n t s o f a q u a c u l t u r e a r e a i n t h e T a n a b e Bay
Gentoku NAKASE
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Aki MIYASHIMAえ
Shigekazu孔1IYANA02,Ken‑ich IZUMI2, Yoshio MUKAI3, Hikam MICHIURA2 and Toshiro NASU4Organic loads in surface sediments at four sampling stations in an aquaculture area were surveyed between 2012 and 2019. The overall average 土(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土0.31and 0.29土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土0.12and 0.18土 0.12mgS/g dry sediment, respectivelyラ indicatinglower organic loads and relatively well回p1'eservedenvironmental condition at these stations. Such differences in AVS values between the stations might have been att1'ibuted fo1' geog1'aphical and envi1'onmental conditions of each site. Rega1'dless of the AVS var・iability,the annuallowest values (values in every Ma1'ch) tended to dec1'ease or were stable. This suggests that the conditions of the bottom sediment in these areas have beenラatleast, not dete1'iorated during the study pe1'iod. Continuous monitoring and survey of organic loads are mandatory for the appropriate use of aquaculture sites as well as for the environmental management.
Key words: Aquaculture areaラBottomsediment, O1'ganic load, AVS, COD
1富 山 実 験 場 (ToyamaStation, Aquaculture Research Institute, Kindai University., 3 Kairyアu,Imizu, Toyama 933皿0222)
2白 浜 事 業 場 (ShirahamaHatchery, Aquaculture Technology and Production Center, Kindai University., 1園5,Shirahama, Nishimuro, Wakayama 649・2211)
日浦神事業場 (UragamiHatchery, Aquaculture Technology and Production Center, Kindai University., 486四3Uragami, Nachi‑Katsuura, Higashimuro, Wakayama 649‑5145)
4株 式 会 社 ア ー マ リ ン 近 大 (A圃marineKindai Co., Ltd., 1‑5, Shirahama, Nishimuro, Wakayama 649幽2211)
*故人
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