The pen tube fish is commonly known as "pen tube". Experts say that although the pen-tube fish is called a "fish", it is not a fish, but a mollusk. According to experts, the pen-tube fish belongs to the class Cephalopoda and belongs to the family Sepiaidae. Its body is slender and can reach up to 15 centimeters in length. Its shape is similar to that of a squid. The individual is shorter and smaller than a squid, and its body is short and wide. Some people also call it "sea hare". This kind of pen-tube fish escapes very quickly, and it can be said that it is as quiet as a virgin and moves as fast as a rabbit.

Piperfish has extremely high nutritional value, containing 32% protein, 9% fat, and vitamins A, D, minerals and other nutrients. It is a top-quality seafood supplement and has anti-inflammatory and antipyretic properties. It has the effect of moistening the lungs and nourishing yin.