On electrical fishing for brown shrimp (Crangon crangon): II. Sea trials

  • Published source details Polet H., Delanghe F. & Verschoore R. (2005) On electrical fishing for brown shrimp (Crangon crangon): II. Sea trials. Fisheries Research, 72, 13-27.


This study is summarised as evidence for the following.

Action Category

Use an electric (pulse) trawl

Action Link
Marine Fish Conservation
  1. Use an electric (pulse) trawl

    A replicated, paired, controlled study in 2000 of an area of seabed in the North Sea, off Belgium (Polet et al. 2005) found that electric pulse trawls targeting brown shrimp Crangon crangon reduced the amount of some unwanted and undersized fish caught compared to standard trawls. Of 12 comparisons, catches of undersized commercial fish were lower in pulse trawls than in standard trawls for whiting Merlangius merlangus in four (58–69% lower), sole Solea solea in two (41–60%), plaice Pleuronectes platessa in five (40–80%) and dab Limanda limanda in two comparisons (61–65%). Lower catches in pulse trawls were also reported in non-commercial tub gurnard Trigla lucerna (one of three comparisons), pogge Agonus cataphractus (three of 12 comparisons), dragonet Callionymus spp. (two of 10 comparisons) and goby Pomatoschistus spp. (six of 12 comparisons). Catches of six other non-commercial species were similar in both trawl designs. Catches of legal-sized commercial fish were typically similar in pulse trawls and standard trawls, except for lower catches of flounder Platichthys flesus (29–37%) and dab (17%) in one and two of 12 comparisons respectively. In addition, undersized shrimp catches were reduced in 11 of 15 cases. In 2000, experimental fishing was undertaken on the Flemish Banks off the Belgian coast using two beam trawls simultaneously, a standard trawl and an experimental electric pulse trawl, with pulse generators fitted to the beam of the trawl in one of two array configurations. Fifty-seven hauls were completed with the experimental trawl being towed on one side of the vessel and the standard trawl on the other. Full details of trawl design and generator configurations are provided in the original study.

    (Summarised by: Leo Clarke)

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 21

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 ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust