Abstract
region of the net-pen. Approximately 87% and 30% of the mean SPM were observed at depth and beside the net-pen, respectively, suggesting that transport of suspended particulates was predominantly in the vertical direction. Sediment trap deployments revealed that sedimentation fluxes of total SPM, carbon, and nitrogen were higher below the farm than at the control site located 500 m away. Major and minor elemental analyses of feed pellets and sediment trap contents showed that calcium, phosphorus, sulphur, and strontium were removed within the net-pen system. The feed-specific carbon isotope signature ( 13 C=21.4 to 22.0‰) was not evident in the trap samples deployed beside the bottom of the net-pen ( 13 C=23.4‰), suggesting the relative absence of feed pellet particles, isotopic alteration through fish assimilation and/or dilution of the isotope signature with other carbon sources. However, a feed-signature was evident in samples collected in the upper water column (depth 5 m), suggesting that 13 C might serve as a useful tracer of feed particles.
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