Shellfish aquaculture produces food, creates economic opportunities in coastal areas, and enhances natural harvests. To foster successful, responsible, and sustainable aquaculture for the future, we need to understand how aquaculture gear may interact with marine ecosystems. Off-bottom tiered oyster cages are growing in popularity as a method for culturing large numbers of oysters on a small footprint. These cages create complex structures that may attract fish and other animals seeking food sources, shelter, and refuge from water currents or protection from predators. Because of the cages' structure, they may function like naturally occurring rock reefs, providing beneficial habitat to ecologically and economically important fish and invertebrates.