1. Crab Acer truncatum is big with convex shell and bright color, while meat crab is small with flat shell and dull color.

2. Crabs have strong claws, thick and delicious meat, tender and smooth crab meat, soft meat and tender taste.

3. Crab ingots are delicious, with low yield and high price. Meat crabs produce more and the price is more close to the people.