The National Oceanic and Atmospheric Administration (NOAA) is issuing a final rule to prohibit the use of spearfishing gear in Gray's Reef National Marine Sanctuary (GRNMS or sanctuary). Possession of spearfishing gear is also prohibited except for vessels passing through the sanctuary without interruption, and only when the gear is stowed and not available for immediate use. Spearfishing can selectively target larger fish, and can significantly reduce abundance and alter the relative size structure of target species toward smaller fish. In addition, spearfishing can impact ecosystem health by altering the composition of the overall natural communities of species. The largest fish are important as predators in maintaining a balanced and complete ecosystem; their selective removal may cause ecological imbalance. Therefore, the prohibition provides protection to the fishes and natural live-bottom community for which the sanctuary was designated. The final rule also facilitates enforcement of an existing prohibition against the use of powerheads within the sanctuary. An environmental assessment has been prepared for this proposed action.