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] Between 2004 and 2022 no confirmed sightings of adult individuals of this species were made, until a specimen was found at a fish market[3] in Cambodia.[4]