Abstract: AT the tenth session of the Indo-Pacific Fisheries Council held in Seoul, Korea, recently, it was recommended that a register of introductions of exotic fish should be compiled by the Food and Agriculture Organization and that institutions and scientific workers should be asked to assist in this. I have undertaken to compile a list of all the introductions of Tilapia spp. into countries where they are not indigenous. Tilapia has already been introduced extensively in a number of countries, and if records are not compiled soon it will not be possible to ascertain the identity of any particular fish. This has already proved the case in some parts of Africa, where fish identified as a particular species in one area have proved different from fish given the same specific name in another area.