Distribution and damage to the by-catch assemblages of the northern Irish Sea scallop dredge fisheries

  • Published source details Veale L.O., Hill A.S., Hawkins S.J. & Brand A.R. (2001) Distribution and damage to the by-catch assemblages of the northern Irish Sea scallop dredge fisheries. Journal of the Marine Biological Association of the United Kingdom, 81, 85-96.


This study is summarised as evidence for the following.

Action Category

Modify the design of dredges

Action Link
Subtidal Benthic Invertebrate Conservation
  1. Modify the design of dredges

    A replicated, paired, controlled study in 1994–1995 in 13 soft seabed sites in the northern Irish Sea, Isle of Man (Veale et al. 2001) found that scallop dredges with shorter teeth caused similar damage to unwanted invertebrate catch, compared to dredges with longer teeth. The damage sustained by unwanted invertebrates was similar when caught in the dredge with shorter and longer teeth (results not shown). A modified dredge design, with shorter teeth and smaller belly ring, was compared to a traditional design (Newhaven with spring-teeth). In 1994 and 1995, up to 13 fishing grounds were surveyed in June and October (at the start and end of the closed fishing season for great scallops Pecten maximus). In each area, one boat simultaneously towed a group of four modified dredges, and a group of four traditional dredges over 2 nm (one group on either side). Unwanted invertebrate catch (crabs, starfish, urchins, whelks, bivalves, hermit crabs, octopus) was sorted to species level, counted, and given a damage score (1= no visible damage, 4= crushed/dead).

    (Summarised by: Anaëlle Lemasson & Laura Pettit)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 19

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust