Study

The AusTED II, an improved trawl efficiency device 2. Commercial performance

  • Published source details Robins J.B. & McGilvray J.G. (1999) The AusTED II, an improved trawl efficiency device 2. Commercial performance. Fisheries Research, 40, 29-41

Actions

This study is summarised as evidence for the following.

Action Category

Fit a size-sorting escape grid (rigid or flexible) to a prawn/shrimp trawl net

Action Link
Marine Fish Conservation
  1. Fit a size-sorting escape grid (rigid or flexible) to a prawn/shrimp trawl net

    A replicated, paired, controlled study in 1994 of three areas of sand and mud seabed in the Coral Sea off Queensland, Australia (Robins & McGilvray 1999) found that prawn trawl nets fitted with a flexible size-sorting escape grid caught less unwanted fish catch and overall unwanted catch (fish and invertebrates combined) than conventional trawl nets with no grid. In one of one comparison in which fish catch was separated from invertebrate catch, nets with a grid caught 15% less fish (2.3 kg/tow) than conventional nets (2.7 kg/tow). In four of four comparisons, grid nets caught 15–49% less unwanted catch (14–50 kg/tow) than conventional nets (17–62 kg/tow). In addition, one shark (species not given) was caught in grid nets compared to three rays Rhinobatos spp. in conventional nets (results not tested for statistical significance). Target prawn Penaeidae catches were reduced (9–36% lower) in modified nets in two of four comparisons. In 1994, experimental trawl deployments were undertaken at three sites in the Queensland east coast fishery. One codend fitted with an AusTED II (a modification of the original AusTED design) escape grid and one conventional codend were towed simultaneously for 60–180 min. Codend catches were kept separate and the target and non-target portions were sorted and weighed for each net after every tow.

    (Summarised by: Leo Clarke)

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