While the average size of hammerhead sharks is 8 to 12 feet and 300 to 550lb, they can reach a maximum size of about 16 to 18 feet and 1,300lb. Female hammerheads tend to grow larger than males and can outgrow them by several feet.
Goliath groupers are, by far, the largest member of the grouper family. These giants can reach a maximum length of 8 feet and a maximum weight of about 800 pounds. The current all-tackle world record goliath grouper is a monster of 680lb.