Among crabs, generally speaking, female crabs have plasters while male crabs do not. This "paste" refers to a yellow greasy substance in the crab's body, also called crab paste. Crab paste is primarily formed from fatty ovarian tissue, which plays an important role in the crab's reproductive cycle.
Crab paste mainly exists in the body of female crabs, especially during the pregnancy period, the production of crab paste will be more abundant. This is why the crab paste of female crabs is more precious and loved by people. In some areas of China, crab paste is considered a delicacy and is highly sought after.
In contrast, male crabs generally do not have a similar paste-like substance. However, sometimes male crabs will develop a paste-like substance during certain seasons or under certain circumstances, but this is usually an anomaly and not the norm.
