I have caught Blue Fin Tuna and Queen fish trolling behind a yacht at night offshore. No fancy lures, we just had a big hook with aluminium off a beer can as the lure, and even had success with tieing chicken feathers as the lure as well. We were using 100lb hand line. The 20kg Tuna was caught just when the Pre Dawn light had just started to lighten the sky, by the time we got it on board the sun was just poking over the horizon... A Magic morning indeed. Sashimi for breakfast, yum!