On the feasibility of a directed trap-fishery for panga Pterogymnus laniarius (Sparidae) in South Africa

  • Published source details Gray M., Hecht T. & Sauer W. (2007) On the feasibility of a directed trap-fishery for panga Pterogymnus laniarius (Sparidae) in South Africa. African Journal of Marine Science, 29, 465-472.


This study is summarised as evidence for the following.

Action Category

Modify fishing trap/pot configuration

Action Link
Marine Fish Conservation
  1. Modify fishing trap/pot configuration

    A replicated study in 2002–2004 in an area of seabed in St Francis Bay in the Indian Ocean, off South Africa (Gray et al. 2007) found that modifying fish traps by increasing the mesh size of the escape panel had no effect on the size-selectivity of commercial target panga Pterogymnus laniarius. The average height of panga in catches was similar between all three relative mesh sizes of the trap escape panels (large: 97 mm, medium: 95 mm, small: 95 mm). In addition, the effect of mesh size on catch species composition, including non-target fish, was not reported, however, it differed with depth and substrate type (see paper for data). Data were collected from 59 trap deployments between September 2002 and July 2004. Three pairs of traps were used during most deployments, each fitted with a different mesh size of escape panel: two large (50 ×100 mm mesh), two medium (50mm × 75mm mesh) and two small (50 × 50 mm mesh). Traps were deployed randomly in depths of 20–99 m and for 2–8 hours. Fish in catches were identified and counted. The sizes of panga, including body height, were recorded.

    (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