Deposits of fish fingerlings of exotic varieties such as Rohu, Katla, Mrigal and Thilopia were being increasingly found in the Kabani River and its tributaries, which were once treasure troves for endemic fishes, K.C. Shaji, a conservation biologist, said at a seminar on biodiversity organised by the Wayanad Prakruthi Samrakshana Samiti in connection with the golden jubilee celebration of the Vechur cow conservation on Sunday.