1, look at the crab belly. The abdomen of male Portunus trituberculatus is triangular, while that of female Portunus trituberculatus is round or oval.
2. Look at the crab navel. If the navel of Portunus trituberculatus looks narrower, it is a male crab, and if it is wider, it is a female crab.
3. Look at crab roe. After opening the Portunus, if there is crab roe in it, it is a female Portunus, and if there is no crab roe but crab paste, it is a male Portunus.