Seabird bycatch mitigation and blue-dyed bait: A spectral and experimental assessment

Authors: 

Cocking, L.J., Double, M.C., Milburn, P.J.

Year: 

2008

Journal/Publisher Name: 

Biological Conservation

Volume (Issue #): 

141

Page #s: 

1354-1364

Contact information: 

Lisa Cocking Australian Antarctic Division 203 Channel Highway Kingston, Tasmania 7050, Australia Lisa.Cocking@afma.gov.au
Summary: 

The use of blue-dyed squid bait on pelagic longlines was tested to determine its ability to reduce both surface and subsurface interactions with seabirds.  In addition, blue-dyed fish bait was tested for its ability to reduce seabird strikes at the surface. Blue-dyed squid bait reduced seabird interactions by 68% compared to non-dyed squid bait when the longline was submerged, and only 3-8% of the blue-dyed squid bait were struck at the surface, compared to 75-98% of non-dyed squid bait.  Around 48% of blue-dyed fish bait was struck at the surface during the first two days of the trial, and 90% were struck over the last three days of the trial.