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Citation: Shephard, S., C.A. Goudey, A. Read, and M.J. Kaiser, 2009. Hydrodredge: Reducing the negative impacts of scallop dredging. Fisheries Research, 95, ps 206-209.
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Summary:

A hydrodredge was tested using water pressure created from the hydrodynamics of the gear to lift scallops out of the seabed. The hydrodredge when compared to a more traditional dredge increased catch of surface-dwelling scallops but decreased catch of deeper-dwelling scallops. Bycatch of starfish, crabs and urchin were less likely to suffer fatal injuries in the hydrodredge.

Field Studies:
Location Fishing gear Reduction technique Bycatch species Effect on bycatch species Catch Effect on target catch Type
United Kingdom Dredge Hydrodynamics Invertebrates Reduced likelihood of mortality Scallops Decreased for deep-dwelling scallops, increased for surface-dwelling species In the wild