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We assessed the impact of salmon farms on the megabenthos associated with muddy habitats using a novel drop-and-drift video camera approach. Megabenthic burrowers and sus- pension feeders were adversely affected by farm proximity, as indicated by modelled benthic flux of dry solids (DSFlux, g m 2 yr 1 ). The burrow-count threshold DSflux was 400, beyond which bur- row density declined rapidly. Suspension feeder densities were reduced by a factor of 4 in close proximity (DSFlux > 8000 g m -2 yr -1 ) to the salmon farms, but only where the sediment was rela- tively muddy. In terms of suspension feeders, threshold levels of DSFlux varied between sites, ranging from 12 to 665 g m -2 yr -1 . There was no evidence that vagile predator/scavengers were either attracted to, or repelled by, salmon farms. We conclude that burrowers and suspension feeders were relatively resilient to salmon farms in muddy, sea-loch habitats and that detectable im pacts did not exceed 100 m from the cage boundary.

Salmon farm impacts on muddy-sediment megabenthic assemblages on the west coast of Scotland