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• W2763742783 abstract "AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AEI 9:461-468 (2017) - DOI: https://doi.org/10.3354/aei00245 Pelagic oxycline and damage potential of hypoxia to the Pacific oyster Crassostrea gigas suspended in longline aquaculture systems Sang Jun Lee1, Qtae Jo1,*, Jong-Cheol Han2, Yeong-Cheol Park3, Tae Gyu Park4 1Shellfish Aquaculture Lab, South Sea Fisheries Research Institute, NIFS, Jeonnam 59780, South Korea 2Shellfish Hatchery Center, Southeast Sea Fisheries Research Institute, NIFS, Gyeognam 52440, South Korea 3Environmental Analysis Lab, Southeast Sea Fisheries Research Institute, NIFS, Gyeognam 53085, South Korea 4Harmful Algal Bloom Lab, Southeast Sea Fisheries Research Institute, NIFS, Gyeognam 53085, South Korea *Corresponding author: qtjo@korea.kr ABSTRACT: Depletion in dissolved oxygen (DO) occurred in 2 semi-enclosed shallow bays in Korea in which Crassostrea gigas were suspended for aquaculture. DO depletion started at the bottom and expanded rapidly upwards for days until it was blocked by a temperature-driven density differential. This resulted in the formation of pelagic oxyclines at a depth of 2–4 m in one bay (Hypoxic Site 1, HS-1) and 2–5 m in the other (Hypoxic Site 2, HS-2). Water above the oxycline was normoxic (>4 mg l-1), while water below the oxycline was hypoxic (<1 mg l-1). The oxyclines were accompanied by significant changes in environmental variables and phytoplankton composition, but these changes were not fatal to the oysters. However, the oxyclines themselves caused oyster mortality: complete mortality below the oxyclines and depth-dependent mortality within the oxycline. Interestingly, mortality was observed in a significant number of oysters above the oxyclines compared with the reference site, and greater mortality was observed in HS-1 than HS‑2. These findings suggest the existence of toxic compounds that diffuse up from below the oxycline in shallow waters and exert effects that overshadow those of DO. The higher mortalities in the HS-1 normoxic layer supported this influence from the bottom layer. In a subsequent experiment, we observed additional mortalities among the surviving oysters in the upper normoxic waters after the bays had completely reoxygenated during fall turnover. These data provide useful observations of hypoxia in highly sheltered shallow waters and can be used to guide site selection for oyster longline aquaculture. KEY WORDS: Oxycline · Sheltered shallow coast · Oyster farm · Damage Full text in pdf format PreviousCite this article as: Lee SJ, Jo Q, Han JC, Park YC, Park TG (2017) Pelagic oxycline and damage potential of hypoxia to the Pacific oyster Crassostrea gigas suspended in longline aquaculture systems. Aquacult Environ Interact 9:461-468. https://doi.org/10.3354/aei00245 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AEI Vol. 9. Online publication date: November 22, 2017 Print ISSN: 1869-215X; Online ISSN: 1869-7534 Copyright © 2017 Inter-Research." @default.
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• W2763742783 title "Pelagic oxycline and damage potential of hypoxia to the Pacific oyster Crassostrea gigas suspended in longline aquaculture systems" @default.
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