Wednesday, 20 May 2015

What is causing the decline?


Shark control activities (meshing, netting, culling)

(Google Images 2014)

















Shark control activities such as Culling and meshing are practices that are also contributing to the decrease in shark populations. Culling targets sharks that come a certain distance to the shore line and seem to be a threat to local beach goers (Reed, Le Page 2014)


Finning

Finning is said to be the most responsible cause to the decline in shark populations (Cemare et al 2007). It is the brutal act of removing the fins from the shark; in most cases the remainder (carcass) of the shark is thrown back into the water where it’ll sink to the bottom of the ocean and die (Speigal 2001). The finning usually occurs whilst the shark is still alive making the process that bit more tortuous for the animal. 






Recreational/Commercial Fishing 

Due to pressures from the Australian commercial and recreational fishing industries, threats from finning, activities such as ‘shark control’ measures, and ecotourism the grey nurse shark has remained listed as vulnerable since (Department of Environment 2014).
Grey Nurse Shark injured by a hood (Google Images 2014)

Around 6% of grey nurse sharks have been recognised to have signs that they have encountered fishing gear at some point in their life (Department of Environment 2002).


Related Links

'Court battle to get grey nurse shark off the hook', Sunday Morning Herald 2007 


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