Marine Ecology Progress Series, 134, 131–150.įrandsen R.P., Eigaard O.R., Poulsen L.K., Tørring D., Stage B., Lisbjerg D. (1996) Effects of scallop dredging on a soft sediment community: a large-scale experimental study. Evidence for other interventions related to the use of dredges are summarised under “Threat: Biological resource use – Cease or prohibit dredging”, “Use lower water pressure during hydraulic dredging”, “Hand harvest instead of using a dredge”, “ Use an otter trawl instead of a dredge”, “Use alternative means of getting mussel seeds rather than dredging from natural mussel beds”, “Use an otter trawl instead of a dredge”, and in “Species management – Cease or prohibit the harvest of scallops”.Ĭurrie D.R. Dredge design can be modified in order to reduce or remove negative impacts on subtidal benthic invertebrates, such as changing the tooth spacing or mesh size, or reducing sediment penetration or bottom-contact (Frandsen et al. Dredging, for instance for bivalves, normally involves towing a heavy steel frame along the seabed, which negatively impacts subtidal benthic invertebrates directly, due to physical damage and the retention of unwanted invertebrate catch, and indirectly by changes to the seabed structure and topography, such as creating dredge tracks (Currie & Parry 1996).
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