Zinc anode covered in mussels on passenger ferrys hull - Low angle dark clip looking up at anode while ship is in drydock for cleaning - High energy consumption of ship because of dirt

anti fouling drydock texture detail grunge dirt dry surface anode mussels bottom hull repair under ship cleaning dirty vessel mollusk intersleek mollusc maintenance industrial silikon boat wash commercial zinc sea grow shell sipyard power yard marine life water oyster aquatic efficiency speed shellfish consumption energy marine covered natural life overgrown seashell