The Danube Delta is part of the UNESCO world heritage since 1990, being classified as a biosphere reserve. Delta has the largest compact reef surface in the world, being crossed by lakes and canals preserving increased biodiversity, an impressive number of birds and fish, but also flat and vegetation (fauna and flora). Delta is home to a remarkable variety of wildlife, over 135 freshwater and marine species (retreating into the Delta or Danube in the breeding season). One-third of these species make a significant contribution to the development of the area, being economically exploited through intensive commercial fishing.