# Council Regulation (EC) No 708/2007 of 11 June 2007 concerning use of alien and locally absent species in aquaculture, Division Step 2: Consequences of establishment and spreading

Extent: E+W+S+N.I.

The assessor is referred for guidance to Appendix A and Appendix B of the ICES Code of Practice.
The final rating for the consequences of establishment and spreading is assigned the value of the element (individual probability) with the highest rating and the final rating for the level of certainty is assigned the value of the element with the lowest level of certainty.
Event
Likelihood(H, M, L)
Certainty(VC, RC, RU, VU)
Comments in support of assessment
Genetic mixing with local populations leads to a loss of genetic diversity.
Competition (food, space) with or predation on native populations leads to their extirpation.
Other undesirable events of ecological nature
Some of the abovementioned events persist even after removal of the introduced species.
Final rating

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Source: https://www.legislation.gov.uk/eur/2007/708/annex/II/part/1/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2007-708/annex-II/part-1/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.