Study

Mesh selectivity in the New South Wales demersal trap fishery

  • Published source details Stewart J. & Ferrell D.J. (2003) Mesh selectivity in the New South Wales demersal trap fishery. Fisheries Research, 59, 379-392

Actions

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, controlled study in 1999–2000 of three fished areas of seabed in the Tasman Sea off New South Wales, Australia (Stewart & Ferrell 2003) found that bottom traps modified with back panels of different and larger mesh type improved the size selectivity of the majority of fish species, compared to the standard commercial trap. For five of 10 species, the estimated size at which fish had a 50% chance of escape (selection size) was greater for modified traps than standard traps (modified: 21–35 cm, standard: 15–25 cm). For four species, the selection size in modified traps was 17–24 cm, whereas all individuals were predicted to be retained in standard traps (see paper for size ranges – reported as length frequency curves). All sizes of one species were retained in both modified and standard traps. See original paper for individual data by species. Data were collected on chartered commercial vessels commercial fishing grounds in three locations during March–October 1999. Deployments were made of three different fish traps, identical (all covered with 37 mm hexagonal wire mesh) except for their back panels: a modified back panel of 50 mm × 75 mm welded mesh (122 trap lifts), a standard back panel of 50 mm hexagonal wire mesh (129 trap lifts), and a smaller 37 mm hexagonal wire mesh to retain and sample all sizes (104 trap lifts). Traps were baited and left on the seabed for 24–72 hours. Fish lengths from the nose to the end of the backbone (fork length) were measured.

    (Summarised by: Rosslyn McIntyre)

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

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