According to Stillwell et al. (1993), sharks are an integral part of the flow of energy in marine ecosystems. Sandbar sharks are considered predators rather than prey, but juveniles may be preyed upon by other sharks. Sandbar sharks are a common host for a number of parasitic copepods, including those in the families Pandaridae, Caligidae, Euphoridae, and Eudactylinidae. Other parasites are isopods in the Gnathiidae family and annelids in the Hirudinidae family, which are both typically attached to the gill filaments. Copepods are often found on the body or fins of the sharks.