Using a double codend to reduce discard mortality

Authors: 

Broadhurst, M.K., Millar, R.B., Uhlmann, S.S.

Year: 

2009

Journal/Publisher Name: 

ICES Journal of Marine Science

Volume (Issue #): 

66

Page #s: 

2077-2081

Contact information: 

M.K. Broadhurst and S.S. Uhlman NSW Department of Primary Industries Fisheries Conservation Technology Unit PO Box J321 Coffs Harbor, NSW 2450, Australia
Summary: 

A double codend was compared to the standard codend in the Clarence River penaeid trawl fishery in southeastern Australia, to determine its effects on total catch, retained and discarded school prawns, sizes of discarded prawns, discarded fish and immediate and short-term mortalities of discarded juvenile school prawns.  The only significant difference between gear types was the immediate and short-term discard mortalities, which were reduced by 13.8% and 17.1% respectively when the double codend was used.  Additional analysis also showed that mortalities of school prawns increased with the quantity of jellyfish.