evidence: The cautious stance of Graham and Worthington found support in other quarters. Kenya fish warden Hugh Copley (1940) wrote that the question of a predatory fish in Lake Victoria is an interterritorial matter and any introduction should take place only after a most exhaustive and searching investigation. It has always been a worry to myself having [American] Black Bass in Lake Naivasha, for it is always possible some irresponsible person will take this fish and stock a dam having an outflow (possibly during the season of heavy rains) to some stream with an ultimate access to Lake Victoria, and thereby introducing a predatory fish whether it was advisable or not.