1. Nutritional value: The crude protein content of pen tube fish is 9.29%, the crude fat content is 1.43%, the moisture content is 85.82%, and the ash content is 1.79%; 18 kinds of amino acids account for the total 55.09% of the dry weight, 8 essential amino acids account for 44.46% of the total amino acids, the ratio of essential amino acids to non-essential amino acids is 0.80; polyunsaturated fatty acids docosahexaenoic acid DHA, eicosapentaenoic acid EPA, 20 The sum of carbedonic acid ARA and octadecadienoic acid LA accounts for 24.94% of the total fatty acid content; it is rich in inorganic elements magnesium, phosphorus, calcium and zinc. It has high protein content, rich essential amino acid content, and low crude fat content. It is a seafood with high nutritional value.

2. The squid has a strange shape. It is a slender cuttlefish, and some people write it as a squid. Some people in Dalian, Qingdao and other places also call it sea rabbit. The squid is also called the Japanese squid, also known as the squid, small squid, and black octopus. From the appearance, it is a kind of cuttlefish with a slender body. The pen-tube fish belongs to the class Cephalopoda and belongs to the family Sepiaidae. Its carcass length can reach up to 15 centimeters. Its shape is similar to that of a squid, but it is shorter and smaller than the squid, and its body is shorter and wider. Some people from Dalian and Qingdao also call it "Sea Hare". Because this kind of pen-tube fish escapes quickly, it can be said to be as quiet as a virgin and as active as a stray rabbit.