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Shark fisheries
The finning process

There are differences in the approach to fin removal between national fleets as some may take more fin and flesh off a shark than others. Indeed, there can be different cuts within the same fleet.
 
Shark Fins © CRAM World.

Different cuts mean that fins are not consistently the same bodyweight and this affects the fin to carcass weight ratio.
 
The first dorsal, pectorals and lower tail fins are most in demand. Collectively they are known as a “primary” or “commercial” fin set.