Credit: D. S. K. Pitigala and Ananda sugathapala (SriLanka) Nallachchiya tank which is a large irrigation system presents a model of multiple use of of irrigation water which leads to magnifying its benefits through fish stocking. Tilapia and common carp (Cyprinus carpio) fingerlings are stocked in the tank through the support of Mahaweli Authority of SriLanka (MASL). Fish …