F4 - Butchering - Fillet Knife
      
  When separting somewhat larger cuts it is a clear advantage to have a longer blade; it gives a more even, cleaner cut. I myself have tried filleting fish with this knife, and it worked excellently - the narrow but fairly rigid blade cuts precisely right through the whole length of an 17 pound salmon.
  
  Blade length 150mm
  Blade thickness 2.5mm