What kind of lure or bait did Santiago use in The Old Man and the Sea?

When Santiago baited the collection of poles that included
the pole on which he caught the "big fish", he used a combination of baits. The main
part of the hook was covered by a tuna, which had been wrapped around the shank of the
hook and sewed in place in preparation for the fishing trip. Sardines were hooked
through the eye sockets to cover and disguise the pointed ends of the double hook. The
lure of the fresh fish enticingly coming through the water at one hundred fathoms depth
was what attracted the marlin to take the bait.