1, different zinc content: per 100 grams of oysters containing zinc is 71.2 mg; and the same weight of oysters containing only 9.39 mg of zinc. 2, the appearance of different: oyster shells and meat are larger, oysters in the shell weight up to more than a catty; and oysters are smaller, generally only a section of the adult thumb size.

The method of purchasing oysters:

1, choose completely closed oysters, the seams are close, tight, on behalf of the oysters are relatively fresh, the shell has been opened oysters may not be fresh enough, should not be used.

2, choose a big head, butt round, body side flat side raised oysters, this oyster meat and fat.

3, choose yellowish color, uniform shape, the color looks maroon oysters. Generally speaking, the fuller the shell and the smaller the skirt of the oyster, the meat will be more fat.

Methods of cleaning oysters:

1. Put on latex gloves, put the oysters into the water, and use a brush to scrub the sediment attached to the oyster shells.

2, pour off the water, add some flour, and mix with the oysters, the purpose is to let the flour absorb the sticky things.

3, rinse the flour with water, add some salt and rinse a few times.

4, if the surface of the oyster is still sticky, that means it is not clean, you can repeat the above steps, wash a few times.