California Department of Fish and Wildlife

Bay Delta Region

Main Office
  7329 Silverado Trail
  Napa, CA 94558
  (707) 944-5500

Stockton Office
  2109 Arch Airport Rd
  Stockton, CA 95206
  (209) 234-3420

Regional Manager:
Scott Wilson

Chinese Mitten Crab Sexing and Measuring


The sex of a crab is indicated by the width of its abdomen (shaded area) which curls around the crab's underside. The male crab has a narrow, triangular abdomen, while the female has a much broader abdomen.


The size of a crab is determined by measuring its carapace (back) width. The carapace width is the distance across the crab's back at the widest point.