invasive species- and organism which is indigenous to a given region or ecosystem, introduced species- known as exotic species organism that is not indigenous to a given location but instead has been accidentally or deliberately introduced to a new location by humans or by natural means. how introduced- ballast water canals, recreational boaters, accidentally imported, pet release, aquaculture, intentional introductions. intentional introductions- introduced by scientist to decrease the population of native and non native species introduced for sport introduced for aesthetic value.