For all non-routine introductions and pilot releases, the applicant shall draw up a contingency plan for the approval of the competent authority, which shall include, inter alia, the removal of the introduced species from the environment, or a reduction in density, for unforeseen events with negative effects on the environment or on native populations. If such an event occurs, the contingency plans shall be implemented immediately and the permit can be withdrawn, temporarily or permanently as per Article 12.