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Hydrodredge: Reducing the negative impacts of scallop dredging

Publication ,  Journal Article
Shephard, S; Goudey, CA; Read, A; Kaiser, MJ
Published in: Fisheries Research
January 14, 2009

Scallop dredges typically use teeth or a cutting bar to dig though the sediment and are associated with detrimental impacts on marine benthos. A low-impact 'Hydrodredge' was tested that uses 'cups' to deflect water downward in a turbulent wave sufficient to lift scallops from the seabed. Trials took place in the Isle of Man fishery for great scallop (Pecten maximus) with the hydrodredge and a gang of local 'Newhaven' dredges towed simultaneously either side of a commercial scallop dredge vessel. When fished over three different ground types (smooth, medium and hard) and two tow-speeds (2.5 kt, 4.0 kt), the proportion of dead scallops and bycatch in the Hydrodredge was significantly less than in the Newhaven dredges. This result highlighted the role of the teeth on the tooth-bar in exerting severe (fatal) damage to the catch and bycatch. Rates of non-fatal damage to scallops and bycatch did not differ between gears, suggesting that such damage occurs as a result of contact with other parts of the gears such as the chain bag. The hydrodredge was less efficient at catching great scallops compared with the Newhaven dredges (10-40%). For great scallops, the cups did not significantly increase catch relative to the hydrodredge fished without cups, which contrasts with results for other surface-dwelling scallop species, e.g., Placopecten magellanicus and Aequipecten opercularis. Importantly, the Hydrodredge was designed in the New England fishery for giant scallop (P. magellanicus), a species typically lighter and less embedded than P. maximus and thus potentially more vulnerable to the flow patterns of the Hydrodredge. © 2008 Elsevier B.V.

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Published In

Fisheries Research

DOI

ISSN

0165-7836

Publication Date

January 14, 2009

Volume

95

Issue

2-3

Start / End Page

206 / 209

Related Subject Headings

  • Fisheries
  • 0704 Fisheries Sciences
  • 0602 Ecology
  • 0502 Environmental Science and Management
 

Citation

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Shephard, S., Goudey, C. A., Read, A., & Kaiser, M. J. (2009). Hydrodredge: Reducing the negative impacts of scallop dredging. Fisheries Research, 95(2–3), 206–209. https://doi.org/10.1016/j.fishres.2008.08.021
Shephard, S., C. A. Goudey, A. Read, and M. J. Kaiser. “Hydrodredge: Reducing the negative impacts of scallop dredging.” Fisheries Research 95, no. 2–3 (January 14, 2009): 206–9. https://doi.org/10.1016/j.fishres.2008.08.021.
Shephard S, Goudey CA, Read A, Kaiser MJ. Hydrodredge: Reducing the negative impacts of scallop dredging. Fisheries Research. 2009 Jan 14;95(2–3):206–9.
Shephard, S., et al. “Hydrodredge: Reducing the negative impacts of scallop dredging.” Fisheries Research, vol. 95, no. 2–3, Jan. 2009, pp. 206–09. Scopus, doi:10.1016/j.fishres.2008.08.021.
Shephard S, Goudey CA, Read A, Kaiser MJ. Hydrodredge: Reducing the negative impacts of scallop dredging. Fisheries Research. 2009 Jan 14;95(2–3):206–209.
Journal cover image

Published In

Fisheries Research

DOI

ISSN

0165-7836

Publication Date

January 14, 2009

Volume

95

Issue

2-3

Start / End Page

206 / 209

Related Subject Headings

  • Fisheries
  • 0704 Fisheries Sciences
  • 0602 Ecology
  • 0502 Environmental Science and Management