We quantify sediment resuspension due to groundfish activity in a partly anoxic basin using acoustic backscatter sensors, transmissometers, and remotely operated cameras on stationary and mobile platforms. Where these fish were present, a distinct benthic nepheloid layer (BNL) developed despite minimal bottom currents (<10 cm s–1). In contrast, water clarity was markedly higher over the adjacent anoxic and fishless zone. Sediment resuspension events, mostly by flatfish, occurred at a rate of >100 disturbances m–2 d–1 resulting in complete surface reworking every 2.5 d and a daily resuspension of 1.3 ± 0.7 l bulk sediment m–2 d–1.
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