6. Japanese Spider Crab
As the name suggestions, the Japanese spider crab inhabits the waters surrounding Japan. In many parts of Japan, this crab can be considered a delicacy but can be considerably difficult to catch. The Japanese spider crab can grow to 12 feet long from claw to claw. There is only one sea creature– amongst similar species (aka crustaceans)– that beats the weight of a Japanese spider crab: the American Lobster.