Expert management plan drafting, adoption, implementation
Management plan drafted, discussed with government officials, and expeditiously implemented. Zoning dedicated largest portion of habitat as no-entry area, but also a peripheral portion of area to swimmer visits. Swimmers organised in groups of ≤10 with a certified guide. Maximum number of visitors/day established. 
Government intervention and facilitation, political will
Strong political will cut corners and greatly helped effectiveness. Plans can be drafted also with poor data availability, with some use of precaution (the initial plan is still in force 13 years later, and results indicate it was effective).