Shifts in benthic bacterial communities associated with farming stages and a microbiological proxy for assessing sulfidic sediment conditions at fish farms. (May 2022)

• Record Type: Journal Article
• Authors: Choi, Ayeon; Lee, Tae Kwon; Cho, Hyeyoun; Lee, Won-Chan; Hyun, Jung-Ho
• Is Part Of: Marine pollution bulletin. Volume 178(2022)
• Publication Date: 2022-05
• Subjects: Fish farming -- Sulfate reduction rate -- Sulfate-reducing bacteria -- Sulfurovum -- Bacterial indicator -- Sulfidic conditions; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2022.113603
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: To assess the aquaculture-induced sediment conditions associated with sulfur cycles, shifts in bacterial communities across farming stages were investigated. The sulfate reduction rate (SRR), and concentrations of acid volatile sulfide (AVS) and H2 S were significantly higher at the mid- and post-farming stages than at the early stage, indicating that the aquaculture effects persist even after harvest. Incomplete organic carbon–oxidizing sulfate-reducing bacteria (IO-SRB) affiliated with Desulfobulbaceae, and gammaproteobacterial sulfur oxidizing bacteria (SOB) ( Thiohalobacter, Thioprofundum, and Thiohalomonas ) were dominant during the early stage, whereas fermenting bacteria ( Bacteroidetes and Firmicutes ) and complete oxidizing SRB (CO-SRB) belonging to Desulfobacteraceae, and epsilonproteobacterial SOB ( Sulfurovum ) dominated during the mid- and post-stages. The shift in SRB and SOB communities well reflected the anoxic and sulfidic conditions of farm sediment. Especially, the Sulfurovum -like SOB correlated highly and positively with H2 S, AVS, and SRR, suggesting that they could be relevant microbiological proxies to assess sulfidic conditions in farm sediment. Highlights: Intense aquaculture activities resulted in highly sulfidic and anoxic sediment conditions. Shifts in benthic bacterial communities occur with the farming stages. Fermenters and Desulfobacteraceae predominated under extremely anoxic conditions. Sulfurovum significantly increased in highly sulfidic condition. Sulfurovum could be used as a proxy to assess sulfidic conditions of the farm sediment.