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Cal Boat Services

Marine Growth Timeline

How fast growth builds up underwater

Marine growth develops quickly in warm Southern California waters. These are real service photos showing typical progression from Day 3 through four weeks. Rates vary by season, sunlight, location, bottom paint, and how long the boat sits at rest.

Marine growth accumulating on the hull surface between cleanings, which adds drag and reduces fuel efficiency.

Hull Surface showing marine growth at Day 3 in Southern California waters
Day 3Early
Hull Surface showing marine growth at 1 Week in Southern California waters
1 WeekLight
Hull Surface showing marine growth at 2 Weeks in Southern California waters
2 WeeksModerate
Hull Surface showing marine growth at 3 Weeks in Southern California waters
3 WeeksHeavy
Hull Surface showing marine growth at 4 Weeks in Southern California waters
4 WeeksService due

Photos are representative service images; actual growth varies by vessel and conditions.