Marine Coating

Marine organism tends to attach to the ship bottom (fishing boat), what kind of paint should be used?
As the fishing boat is usually cruising at slower speeds or stops frequently, the lower-speed ship anti-fouling paint should be used.
The anti-fouling paint at the ship bottom (commercial ship, fishing boat) tends to peel off, how should it be treated?
Before applying the paint, remove the contaminants and oil stains completely and then apply the coating till after the surface is dried through.