September female crabs weighing more than 2.5 taels or October male crabs weighing more than 3.5 taels.

Chengyang Lake hairy crab form has four major features: one is the green back, crab shell into the green mud color, smooth and glossy; two is the white belly, stick to the mud of the umbilical cord abdominal crustaceans, crystalline white, no ink spots; three is the yellow hair, the crab legs of the hair is long and yellow, the roots of the uplift; four is the golden claw, crab claws golden, solid and powerful.