There is also a profitable shark fishery in the hands of Arabs.
Hardly of less scientific interest is the Port Jackson shark (Heterodontus).
A, Shark (Lamna cornubica), with long lobe of tail upturned.
The manufacture of cod-liver oil for pharmaceutical purposes is naturally somewhat limited, as Norway, Newfoundland, and latterly also Japan, are more favourably situated as regards the supply of fresh cod, but the technical liver oils (cod oil, shark-liver oil) are produced in very large quantities in Grimsby, Hull, Aberdeen, and latterly also on the west coasts of the United Kingdom.
My guess is that you accept the slim possibility that a shark might get you, and swim in the ocean anyway.