Isla Guadalupe as you know, is simply "infested" with great white sharks. This is the last place on the planet you want to be taking a morning swim.
Which makes fishing for Yellowfin tuna here nearly impossible. What you are looking at is an 80lb tuna caught a few seasons ago who was having a really, really bad day.
The single shark bite from this tuna took almost 40lbs of prime grade sushi away (click image). The shark in question was about 14 feet long. Not huge by Guadalupe standards but an impressive critter none the less.