Using a double codend to reduce discard mortality
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Published source details
Broadhurst M.K., Millar R.B. & Uhlmann S.S. (2009) Using a double codend to reduce discard mortality. ICES Journal of Marine Science, 66, 2077-2081.
Published source details Broadhurst M.K., Millar R.B. & Uhlmann S.S. (2009) Using a double codend to reduce discard mortality. ICES Journal of Marine Science, 66, 2077-2081.
Actions
This study is summarised as evidence for the following.
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Modify the design or configuration of trawl gear (mixed measures) Action Link |
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Modify the design or configuration of trawl gear (mixed measures)
A replicated, controlled study in 2007 of an area of seabed in an estuary flowing into the Tasman Sea, Australia (Broadhurst et al. 2009) found that modifying a prawn trawl by separating the codend into two compartments (double codend) did not reduce the catches of discarded finfish, compared to a conventional single codend. Average catch weights of discarded finfish species were similar for double and single codend trawls (double: 0.9 kg, single: 1.0 kg). In addition, average retained and discarded weights of the target school prawn Metapenaeus macleayi were both similar between codend types (double: 0.7–9.3 kg, single: 0.8–9.5 kg). In October 2007, a total of 24 trawl deployments (1 h) were done on a prawn fishing ground in Lake Wooloweyah, Clarence River estuary, New South Wales. Two codend types were tested: one modified with two compartments (12 hauls), and one with a single codend (12 hauls). Both codend types were square mesh (27 mm) and had a size-sorting escape grid (see original paper for gear specifications).
(Summarised by: Khatija Alliji)
