Medero prefers a small J hook to counter the tuna’s exceptional vision and for a deep hook-set. The risk is the leader chafing, especially with 30-pound fluoro. We lost a few big tuna to that. While Medero is a master at catching large blackfins, instead I prefer a 3/0 or 4/0 in-line circle hook, based on bait size. My goal: a jaw-set, with the hook eye and the entire leader remaining outside the fish’s mouth, away from teeth and chafing.