The number on the box represents the number of frozen shrimps weighing one catty. For example, 30/40 means that there are about 30-40 frozen shrimps weighing one catty.
The smaller the quantity, the bigger the size of a single shrimp and the more expensive it is. On the contrary, the larger the quantity, the smaller the size of a single shrimp and the cheaper the price.
High-quality shrimp is the most basic condition for successful cooking, so you must choose fresh, non-toxic, pollution-free, rot-free and impurity-free shrimp.
The cooked shrimps are mainly natural in shape, and the ingredients must be similar in size, so that the shrimps can be heated evenly, and the mature shrimps are old and tender, pure in color and beautiful in shape.
Extended data
Method for selecting fresh shrimp
1, no odor.
Fresh shrimp has a normal fishy smell. If there is an odor, it means that the shrimp has been stored for too long, which leads to rot and deterioration.
2. The meat shells are closely connected.
Fresh shrimp shells are tightly attached to shrimp meat. When peeling shrimps with your hands, the shrimps will stick to your hands, and it takes a little effort to peel the shrimp shells. The intestinal tissue of fresh shrimp is also tightly attached to the shrimp meat. If there is looseness, it means that the shrimp is not fresh.
3. Test the bending force.
Fresh shrimp has a complete head and tail and is closely connected with the body. Shrimp body is quite hard, with certain elasticity and curvature. However, the head and body, shell and meat of aged shrimp are loosely connected, and the head and tail are easy to fall off or separate, which can not maintain its original curvature.
Refer to Baidu Encyclopedia-Shrimp