Figuring out whether a crab is female vs male is pretty straightforward for many species because they look distinctly different. Knowing the difference matters for fishing regulations, scientific studies, and even cooking.
Here are the primary things to look for: the shape of the abdomen, the size of the claws, and the reproductive organs.
Apron Shape
The easiest way to tell a male from a female crab is to look at the shape of the abdomen, or “apron,” on the underside of the crab.
Male Apron
The male crab has a narrow, triangular apron that points toward the rear of its body.
Female Apron
The female crab’s apron is wider and more rounded than the male’s, because it’s designed to hold eggs.
Claw Size
Male and female crabs can often be distinguished by their claws. In many species, the male crab will have larger, thicker claws than the female. They use these claws in mating displays and to compete with other males. However, some species have minimal differences in claw size between the sexes.
Reproductive Organs
You can also tell the difference between male and female crabs by looking at their reproductive organs, but this method is usually used by experts or when dissecting crabs.
- Male reproductive organs are on the underside of the thorax.
- Female reproductive organs are located on the abdomen near the tail.
Frequently Asked Questions
What is the orange stuff in a female crab?
That vibrant orange material you find inside a female crab is roe, also known as crab eggs or coral. It’s essentially the crab’s unfertilized eggs and is considered a delicacy by many. The flavor is often described as rich and slightly briny.
Which is better to eat: male or female crabs?
That’s really a matter of personal preference! Male crabs typically have more meat in their claws, while female crabs, especially those with roe, offer a different flavor profile that some find more desirable. If you’re after pure meat quantity, go for a male. If you’re curious about the unique taste of roe, a female is the way to go.
Can crabs be both genders?
While it’s rare, some crabs can exhibit hermaphroditism, meaning they possess both male and female reproductive organs. However, this is not the norm. Crabs are typically either male or female, and their gender is determined at birth. True hermaphroditism, where a single crab functions as both male and female simultaneously, is uncommon.
In Closing
If you’re crabbing, knowing how to tell a female crab from a male crab is essential. The shape of the apron on the underside of the crab and the size of the claws are usually reliable indicators.
Correctly identifying crabs is important for following local regulations. If you catch a crab that’s too small or is a female when the regulations prohibit keeping them, be sure to release it respectfully back into the water.