Groupers and snappers are important fishery resources of the tropics and subtropics, where their high values have caused most of their stocks to be heavily exploited, some even to the point of collapse. Trends towards heavy demand and decreasing natural supply, which are accelerating in several parts of the world, prompted various mariculture ventures. Focused research on biology and the population dynamics of groupers and snappers, and on their reproduction and growth under controlled condition will remain essential for dealing with the questions on how to better manage their fisheries. This volume of papers presents important scientific findings and views on these two important groups of fish.