The giant salmon carp (Aaptosyax grypus), also termed the Mekong giant salmon carp, is a species of freshwater fish in the family Cyprinidae and the single species in the monotypic genus Aaptosyax.[1] It is endemic to the middle reaches of the Mekong River in northern Cambodia, Laos and Thailand. Its population is much reduced (>90%) as a result of overfishing and habitat degradation, and it is now considered Critically Endangered.
This fish can reach a length of and weight of .[2] Until 2022 no adult individuals had been seen of this species, until a specimen was found at a fish market.[3]