Like many anglers, I've developed a bucket list of must-catch fish species over the years. Whether elusive, colorful, powerful, acrobatic, or just plain odd, each entry is unique. The roosterfish has always topped that list, and that is what brought me to La Paz, Mexico, and the Sea of Cortez. Dubbed "the aquarium of the world" by French oceanographer Jacques Cousteau, Cortez's waters teem with the baddest roosterfish in the world. Members of the jack family, roosters rarely wander far offshore. Amply muscled and agile, they are characterized by endurance, an unequaled nasty demeanor, and the sportfishing world's most unusual dorsal fin--seven long spines that resemble a rooster's comb.