Sea Wyverns (name not final) nest on small, rocky islands scattered throughout the sea and primarily catch fish going somewhat below the water. Basically, wyverns ingest a piezoelectric crystal which they store, and when they eject a flammable liquid which they store in a gland, they squeeze the crystal, igniting it. Now I was wondering - how might a sea wyvern adapt its flame breath to its life style? Would it just use it to cook the fish it catches? Or could it modify it to help catch fish and if so how?
NOTE: magic does not exist in my story