Meeli, using Fireline or any type of braid and targeting sharks is going to leave you with very sore arms, shoulders and back.
This is using it as mainline and not just as backing. You need some line (mono) ( even if just 150m) in front that can act as a shock absorber and allows a bit of stretch.
Tackling edibles --- no problem, then again be sure to add a leader ( 2 x rod length)