The conservation status of the vast majority of hydrozoan species is unknown. Species in two families, the fire corals (Milleporidae) and the lace corals (Stylasteridae), have been commercially harvested, and in some places over-exploited. They are now listed in Appendix I of CITES, the international treaty limiting trade in wildlife. Also the IUCN has evaluated many species of Millepora and rated several of them Endangered.
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