geometric objects. The mechanisms of flow usage in fish schools will be discussed as an example of biotically generated flows. Exploiting self-generated flows, while in certain situations an important mechanism to enhance locomotory performance,will not be covered in this review. As early as the 1960s, Breder identified the potential benefits of swimming in turbulent flows. He suggested that fish swimming among vortices may be ‘taking advantage of the lessened flow downstream of the side of the vortex which is moving countercurrent. taking advantage of may be the only means by which such fishes are able to negotiate flows as.