The Reserve Effect study is an effective tool to measure the beneficial effects of a MPA. Fish fauna is considered to be the most effective indicator of the impact of fishing activities and has been widely used to quantify the ecological changes resulting from the ban on harvesting activities in MPAs. MPA fish fauna has been investigated to: assess the effects of different harvesting activities in areas A, B, C; identify areas/types of habitats worthy of special attention that also host fish species protected by international conventions.