The skeleton is excavated 1-2 cm, forming a sharp interface with live tissue. YBD is more common on other Montastraea species. J. Hyperplasm on brain coral, Diploria strigosa . Growth is accelerated due to an increase in the number of cells, giving the affected area a raised, exaggerated appearance compared with surrounding healthy tissue. K. Bleaching in Porites astreoides .
Bleached areas are pale to white and dispersed irregularly.
Dark areas may be slightly depressed and may die. Previously thought to be a disease, RM is caused from repeated biting by the three spot damselfish, Stegastes planifrons . Tissue mortality progressively spreads outward.