By: Lukas Stocker
Editor’s Note: This article is a guest contribution provided by Lukas Stocker owner of The Hull Master team. The content reflects the views and perspectives of the author. The Log did not participate in the writing or editorial development of this piece.
Our hull divers are seeing a noticeable slowdown in bio growth on customer hull, but the broader trend suggests this is temporary. Current water data reflects a system that has stabilized after February rains but has not yet ramped up into its typical spring pattern.
Water temperature is holding at 61 degrees Fahrenheit, slightly above normal, keeping conditions warm enough to support growth. Salinity has returned to a stable 33.2 PSS, in line with seasonal norms. Good News: Chlorophyll is measuring just 0.8 micrograms per liter, well below the normal level of 3, indicating reduced biological activity in the water. At the same time, dissolved oxygen is elevated at 8.2 milligrams per liter compared to the normal 7.4, which often corresponds with lower overall organism density.
Together, these data points show that while the environment is stable and warming, the base of the food chain has not yet fully developed, resulting in slower than expected growth for this time of year. Great news for owners.
This creates a short-term window where hulls are cleaner, and growth is manageable with regular cleanings. Slime layers are still forming, particularly on sun exposed surfaces, but the progression into heavier algae and hard growth is delayed. It is a subtle slowdown, not a stop.
Looking ahead, the key factor is temperature. Water is already warmer than normal, and as daylight, chlorophyll levels are likely to rise. That combination of warmth and available nutrients sets the stage for a strong seasonal ramp up. When that shift occurs, growth can accelerate quickly from light slime into more established fouling.
The Hull Master recommends maintaining a once per month cleaning schedule in Southern California waters under these conditions to stay ahead of that transition. It is also important to keep a close eye on the waterline, especially after heat waves like the one we just experienced. Short periods of elevated temperature can quickly accelerate slime buildup and lead to clogged inlets and reduced performance if left unchecked.
The takeaway is that while March feels slower, it is setting up the conditions for a more active late spring and potentially heavier summer growth. Staying consistent with cleaning now will help avoid a rapid buildup as the season turns.
