Conservation status

No Beloniformes are CITES listed, or listed as endangered by the U. S. Fish and Wildlife Service. However, 16 species are included on the IUCN Red List. Eight of those, mostly Oryzias species, are categorized as Vulnerable, one species is listed as Lower Risk/Near Threatened, and two species are listed as Data Deficient. Three species are listed as Endangered: Oryzias orthognathus, Xenopoecilus oophorus, and Xenopoecilus sarasinorum. Listed as Critically Endangered are Adrianichthys kruyti and Xenopoecilus poptae, both of which are known only from Lake Poso, Sulawesi. Although no Be-loniformes are formally listed as Extinct in the Wild by the U. S. Fish and Wildlife Service or Extinct by the IUCN, Adrianichthys kruyti is generally thought to be extinct. Pressure from an introduced species of catfish, in addition to parasites that entered the lake with the catfish, are implicated in the decline of the Lake Poso adrianichthyids.

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