An African fish poses a grave threat to varieties of native fish in the famous Jaisamand lake at Udaipur. The fish, Oreochromis Mossambicus, locally known as "Telapiya" was eating up the local species. With the result the native fishes number is depleting rapidly. Besides, this foreign invader can even endanger the aquatic life of the entire Mahi river ecosystem, fear fishery experts in Rajasthan Agricultural University (RAU).