Study

Selectivity experiments to estimate the effect of escape windows in the Skagerak roundfish fishery

  • Published source details Madsen N. & Stæhr K. (2005) Selectivity experiments to estimate the effect of escape windows in the Skagerak roundfish fishery. Fisheries Research, 71, 241-245

Actions

This study is summarised as evidence for the following.

Action Category

Fit mesh escape panels/windows to a trawl net

Action Link
Marine Fish Conservation
  1. Fit mesh escape panels/windows to a trawl net

    A replicated, paired, controlled study in 2000 of a bottom fishing ground in the Skagerrak, northern Europe (Madsen & Staehr 2005) found that fitting square mesh escape windows to bottom trawl codends improved the size selectivity of small Atlantic cod Gadus morhua in two of two cases and of haddock Melanogrammus aeglefinus in one of two cases, compared to a standard codend without escape windows. For cod, the selection length (the length at which fish have a 50% chance of escape) was greater in both top- and side-window codends than no windows (top: 29.9 cm, side: 29.9 cm, none: 25.5 cm) and for haddock, the selection length was higher only in the top-window codend (top: 31.9 cm, side: 28.8 cm, none: 28.8 cm). Trials were done in June 2000 on a commercial fishing vessel towing a twin-trawl net. Data were collected from 37 deployments of a small-meshed (35 mm) control codend fished at one side and a test codend at the other side, and sides changed regularly. Three codend types were tested: a standard codend (104 mm mesh) with an 85 mm square mesh top window; a standard codend with two 85 mm square mesh side windows; and a standard codend (see paper for specifications). Deployments were 2.9 h duration, speed 3.1 knots and 20–80 m depths. Fish sampling procedure was not reported.

Output references

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, terrestrial 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 18

Go to the CE Journal

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

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