Introduction of a alien species should be considered only if clear and well-dfined benefits to man or natural communiteis can be expected.
Introduction of an alien species should be considered only if no native species seems suitable for the same purpose.
No alien species should be deliberately introduced into any natural habitat (one not perceptibly altered by man), island, lake, or ocean, whether within or beyond the limits of national jurisdiction.
Introductions should not be made into semi-natural habitats except for exceptional reasons and only when the operation has been comprehensively investigated and carefully planned in advance.
Introductions into highly modified habitats should take place only after the effects on surrounding natural and semi-natural habitats are assessed.
Source:
IUCN. 1987. Translocations of living organisms. IUCN, Gland, Switzerland.
