Sperm whale depredation of sablefish longline gear in the northeast Pacific Ocean

By Michael F. Sigler, C. Lunsford, J. Straley, Joseph Liddle. 2008

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Behavioral biology of marine mammal deterrents: A review and prospectus (2013, background): “…(Orcinus orca), sperm whales (Physeter macrocephalus), and bottlenose dolphins (Tursiops truncatus) have been reported to steal fish from fishing lines, nets, fish ladders or aquaculture pens (Yano and Dahlheim, 1995; Gillman et al., 2006; Sigler et al., 2008; Read, 2008; Forney et al., 2011).”
The understudied and underappreciated role of predation in the mortality of fish released from fishing gears (2014, background): “Although it is an important and related topic, we do not include depredation, wherein predators remove or kill fish hooked on longlines or rod and reel, or entangled in gill nets prior to landing (e.g. Zollett and Read 2006; Sigler et al. 2008; O’Toole et al. 2010).”
Recreational fishing depredation and associated behaviors involving common bottlenose dolphins ( Tursiops truncatus ) in Sarasota Bay, Florida (2011, background): “Depredation of commercial and recreational fishing gear by cetaceans is a growing problem around the world (Broadhurst 1998, Secchi and Vaske 1998, Donoghue et al. 2002, Noke and Odell 2002, Cox et al. 2003, Lauriano et al. 2004, Brotons et al. 2008, Sigler et al. 2008).”