This 11-foot, 6-inch white sturgeon from British Columbia’s Fraser River might be the largest ever caught on rod and reel. Courtesy Sturgeon Slayers There are big fish, and then there are giant fish.

A keystone species of the Amazon River ecosystem, the arapaima is a powerful predator known by many names. Mike Bock Reaching up to 10 feet (3 meters) long and weighing 440 pounds (200 kilograms), ...