Scientific name: Adrianichthys kruyti
Range: Lake Poso, Sulawesi, Indonesia
When last seen: 1983
Suspected reason for disappearance: Local fishermen believe its decline it is related to the eruption of the nearby Colo Volcano in 1983. Invasive species have likely also played a part, and introduced diseases and parasites are also possible explanations. Overfishing has also likely caused numbers to plummet.
IUCN conservation status: Critically Endangered
Size: Grows up to 16 cm, though usually closer to 11cm.