Binary crab and ternary crab, also known as old-headed crab, that is, early-maturing crab seedlings, are very small. Merchants sell this kind of crab at the price of one yuan, two yuan and three yuan. Early-maturing crab seedlings, premature development, fixed body, generally the size of coins, each weighing 4-6 yuan. Except for its small size, it has the same nutrients and body structure as hairy crabs.

Don't buy crabs oxygenated in water. Basically, it lasts for a few days. The meat is empty. After cooking, open a bag of water. It's stale. You can't eat good crabs at all.

Pick crabs

The first trick: look at the crab's calf. Whether a crab is fat or not depends first on the two calves at the bottom of the crab. If its calf looks particularly round and feels full when pinched, it is a fat crab, and vice versa.

The second trick: look at the two horns protruding from both sides of the crab shell. Looking at the bright place, the crab's stomach is up. If it is transparent, it is a thin crab that is soft to pinch. If it is dark fleshy, it will be fatter.