Gammarus setosus, or more commonly, side swimmers (scuds), are amphipod crustaceans of small, often green physical structure that resides mainly in the intertidal zones in the northwestern atlantic regions. During winter and spring, it is the most plentiful species of. In the other half of the year, the majority of this species exist in the stretch of the coast spanning from the panarctic atlantic to the bay of fundy of new. Brunswick, and also in northern newfoundland (v. steele & d. steele, In this distribution, they inhabit beneath moderately exposed sheltered loose rocks, elevated higher in the intertidal zone compared to other gammarus species. In this experiment, we plan to study and observe the swimming patterns and locations of gammarus setosus in its natural habitat. They are often found swimming in shaded and dark regions in the intertidal zone, such as beneath rocks and algae or on the seafloor.