Like Gao Qiqiang. In The Knockout, Gao Qiqiang started as a small vendor selling fish by watching Sun Tzu's Art of War. He mastered the essence of Sun Tzu's Art of War and became a boss step by step. The fish I want to sell is a network stalk created by netizens according to this TV series. It means that fish, like Gao Qiqiang, is a kind of temperature-changing aquatic vertebrate covered with bone scales, which feeds on the upper and lower jaws through gill breathing, tail and trunk swinging and coordinated swimming of fins.