The Grado Lagoon is also rich with “Valleys of Fish” (fish beds) which continue to function; this ancient system of valley farming is seen by outsiders as a sort of factory where fish come to grow until the moment of sale.
These fish valleys are a collection of bodies of water and canals regulated by closures so as to maintain the optimal level of water for the development of the fish. It is practically made of large pools connected semi-naturally used for the raising of the “avanotti”, that is, high quality fish, placed in this natural environment with only a few days of life and followed carefully until the moment when they are mature and able to be sold.