Learn the Oregon Department of Fish and Wildlife Crab Fishing Measurement:
With a Crab Gauge, measure all male Dungeness crab retained. A male crab has a “V” shape on the underside. A female has a round shape on their underside.
Only retain the male Dungeness crab that are 5 3/4 inches across the back (Not including the spines) or wider.
When measuring make sure you measure in a straight line across the back immediately in front of, but not including the last points.