Study

Tropical prawn trawl bycatch of fish and seasnakes reduced by Yarrow Fisheye Bycatch Reduction Device

  • Published source details Heales D.S., Gregor R., Wakeford J., Wang Y.-., Yarrow J. & Milton D.A. (2008) Tropical prawn trawl bycatch of fish and seasnakes reduced by Yarrow Fisheye Bycatch Reduction Device. Fisheries Research, 89, 76-83

Actions

This study is summarised as evidence for the following.

Action Category

Fit large, supported escape openings (such as Fisheyes, Bigeyes and radial escape sections) to trawl nets

Action Link
Marine Fish Conservation
  1. Fit large, supported escape openings (such as Fisheyes, Bigeyes and radial escape sections) to trawl nets

    A replicated, paired, controlled study in 2002 of a fished area of seabed in the Gulf of Carpentaria, off Australia (Heales et al. 2008) found that using a large, supported escape opening (new design of Fisheye) in a prawn trawl net reduced the amount of unwanted small catch (fish and invertebrates combined) compared to a standard prawn trawl net with no large escape opening. The average catch weight of small unwanted fish and invertebrates was lower with the Fisheye escape opening compared to without (with: 136–219 kg, without: 183–254 kg). In addition, there was no difference in the average catch weights of the commercial target species of tiger prawns, Penaeus esculentus and Penaeus semisulcatus, between trawl nets (with: 13–18 kg, without: 13–19 kg). Data were collected in November 2002 from 29 comparative trawl deployments by a commercial trawler on prawn fishing grounds in the south-western area of the Gulf. The vessel towed a pair of identical prawn trawl nets, both fitted with a compulsory downward-excluding size-sorting grid (Super-shooter type). One of the trawl nets also had a new design of large escape opening (Yarrow Fisheye): a rigid frame on the upper trawl section, creating a semi-round escape opening (see paper for specifications). The combined use of size-sorting excluder grids with other catch reduction devices was made compulsory in Australia’s Northern prawn fishery in 2000. Catches were separated into small unwanted catch (fish and invertebrates combined) and target prawn species and weighed.

    (Summarised by: Natasha Taylor)

Output references

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