controls, pre-border, border and post-border biosecurity, 
and measures to address escape from confinement. 
Prevention is particularly critical in marine and connected 
water systems, where most attempts at eradicating or 
containing invasive alien species have mostly failed. 
Prevention has been particularly effective on islands. 
Preparedness includes border surveillance, early detection 
and rapid response planning, and is critical to reduce 
rates of establishment. Horizon scanning and risk analysis 
can support prevention and preparedness by prioritizing 
emerging invasive alien species. Sustained and adequate 
funding, capacity-building, technical and scientific 
cooperation, transfer of technology, monitoring, relevant 
and appropriate biosecurity legislation and enforcement, 
and quarantine and inspection facilities are necessary for 
effective prevention measures.
15SUMMARY FOR POLICYMAKERS
The thematic assessment report on
INVASIVE ALIEN SPECIES
AND THEIR CONTROL
TIC ASSESSMENT REPORT ON INVASIVE ALIEN SPECIES AND THEIR CONT