• 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.