Nassau groupers prey on a variety of marine invertebrates and fish. They compete with other groupers because of overlapping habitat and also likely compete with snappers, jacks, barracudas, and sharks. Nassau groupers also act as hosts to a number of parasites, including copepods, nematodes in the gonads, several trematodes (Lecithochirum parvum and Lecithochirum microstomum) in the gut, and larval tapeworms that infest the viscera. Nassau groupers also form a symbiotic relationship with some gobies and shrimp, which remove parasitic copepods from their bodies, fins, mouth, and gill chambers.
- Sullivan, K. 1997. The benifits of a marine fishery reserve for Nassau grouper Epinephelus striatus in the central Bahamas. The Nature Conservancy, 8/2: 1-5.