On fishing selectivity of hadrah (fixed stake trap) in the coastal waters of Kuwait

  • Published source details Al-Baz A.F., Chen W., Bishop J.M., Al-Husaini M. & Al-Ayoub S.A. (2007) On fishing selectivity of hadrah (fixed stake trap) in the coastal waters of Kuwait. Fisheries Research, 84, 202-209.


This study is summarised as evidence for the following.

Action Category

Use a larger mesh size

Action Link
Marine Fish Conservation
  1. Use a larger mesh size

    A replicated, paired, controlled study in 2001–2002 at three intertidal sites in the Persian Gulf, Kuwait (Al-Baz et al. 2007) found that increasing the mesh size in fish traps (hadrah) did not typically improve the size-selectivity for a variety of fish species compared to a smaller conventional mesh size. The length at which fish had a 50% chance of escape was greater in traps with larger mesh sizes (51 mm or 25 mm) compared to conventional traps (19 mm) in only six of 40 comparisons, similar between mesh sizes in 31 comparisons, and smaller in the larger mesh sizes in three comparisons (see original paper for individual data for 25 fish species/groups). Sampling was carried out from October 2001 to December 2002 at three sites (Failakah, AlBaq’sh and Abu Hasaniyah). At each location, two traps were deployed: one of two experimental traps consisting of either 25 mm (AlBaq’sh and Abu Hasaniyah) or 51 mm (Failakah) mesh size, and a conventional trap of 19 mm mesh size. The two traps were positioned near to one another and fish were removed after 24 h and length recorded. A total of 153 samples were collected at Failakah, 38 from AlBaq’sh and 30 from Abu Hasaniyah.

    (Summarised by: Chris Barrett)

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