These are the spots left with hard growth from the slings that hauled the boat out. Before they pressure washed it, the entire hull and keel looked like this. Dave cleans the bottom on a regular basis so this is only about 6 weeks growth. Boats that aren't cleaned get a really thick "beard". The new bottom paint should retard the growth but it's only good for about 2-3 years. Sea critters love the warm water so it's always an issue on the gulf coast.
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