Final answer:
To prevent striking a swimmer with a boat propeller, regularly clean your boat and equipment, and rinse them thoroughly.
Step-by-step explanation:
To prevent striking a swimmer with a boat propeller, there are several important steps you can take. Firstly, make sure to remove all visible plants, animals, mud, and debris from your boat hull, propeller, anchor, and trailer before launching into the water. Secondly, drain and rinse all live wells, bilge areas, and coolers to ensure there are no unintentional passengers in your boat. Lastly, rinse all fishing equipment, boats, trailers, and SCUBA gear with a hard spray from a garden hose to remove any potential hitchhikers.