What is the difference between male crabs and female crabs?

There are three main differences: 1. Different sizes: male crabs are larger than female crabs. 2. The belly buttons are different: the belly buttons of male crabs are triangular, while those of female crabs are round. 3. The villi on the legs are different: male crabs have more villi on their legs, while female crabs have smooth legs.

Extended information: Tips for selecting fresh crabs:

1. Check the degree of connection between limbs and body. The legs of fresh crabs are closely connected to the body. When the crab body is lifted, the legs do not sag. Stale crabs will obviously show signs of slackness at the rotatable joints between their limbs and body. If you lift the crab body with your hands, you will see that the limbs (legs) are sagging downwards. 2. Look at the "stomach print" above the abdominal umbilicus. Crabs mostly feed on humus. After a period of time after death, the stomach contents of stale crabs will rot and a black mark will appear on the ventral surface of the crab body above the navel.

3. Whether the crab "yolk" is solidified. The substance called "crab roe" in crabs is where various internal organs and reproductive organs are located. When the crab body is in the stage of rigor mortis, the "crab roe" is solidified. Crabs that are not fresh will be in a semi-liquid state. When the crab body deteriorates, it becomes even thinner. When you hold the crab body and turn it over, you can feel the flow inside the shell.

4. Look at the gills. Fresh crabs have clean gills, clear gill filaments, and are white or slightly yellowish brown. The gill filaments of stale crabs begin to rot and stick together, but this can only be observed after peeling off the carapace.