The great whites were very populous in So. Calif until the early 20th century.
They were fished out almost completely 1000 miles out by the late 40s.
My uncle made a living fishing them for their livers which were used to manfacture vitamin B12 (I believe and can’t confirm since my uncle is now dead) and 50 years ago he told me they will be back.
I wonder if one can use a guitarfish to practice scales?