1, depending on color and appearance.
No matter what crab you choose, you should choose live crabs, even if you are dead, don't buy them. Live swimming crabs should also be paid attention to, to be intact. It is a decapod arthropod, and the total number of crab claws and feet is 10, which is very fresh. The color of crab shell is blue, smooth and shiny. If the color is white, it means it is not fresh.
Step 2 touch the swimming crab
Crabs are very alert. When it senses danger, it will run away at once. Touch the swimming crab with your hand, and the instruction to run away immediately is very fresh. If you don't move, you are either dead or dying. If the swimming crab is turned upside down, it can be turned over quickly, which also shows that it is full of vitality and freshness.
Step 3 weigh it
Just like buying fruit, you have to weigh the swimming crab by hand. Two Portunus crabs of the same size, the heavier one contains more crab meat, crab roe and crab paste, while the lighter one is just empty. And it depends on whether there is water injection.
Preservation method of live swimming crab
1. Method 1 of feeding crabs: put them in the bathtub.
Put it in the bathtub and let the bathtub be used as a pond for the time being. Gently put the fresh crabs you bought in, inject the water that has just passed the crabs, let the crabs stand up and breathe, and put a small amount of small fish and shrimp into the water as needed.
2. Preservation method 2 of live crabs: put them into plastic buckets or pots.
If you don't have a bathtub at home, you can put crabs in a tall plastic bucket/basin with smooth inner walls. Be careful not to stack them. Just add water to half the height of the crab. You can't bury all the crabs. Too deep water will make them unable to breathe.
3. Preservation method 3 of live crabs: put them in the refrigerator.
Pickled live crabs can also be put in the refrigerator, but pay attention to the method. First, find a foam box with a suitable size according to the freezer of your refrigerator, then tie the legs and feet of the crab and put them in the foam box one by one, and then add the water that has been on the surface of the crab to the box. Finally, cover the foam box and put it in the freezer.